diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..7b0a7ed
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,11 @@
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+insert_final_newline = true
+trim_trailing_whitespace = true
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diff --git a/.gitignore b/.gitignore
index 5a2323a..69b6ce8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,7 @@
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 /build
 /node_modules
 /bower_components
diff --git a/dist/flow.compat.min.js b/dist/flow.compat.min.js
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index 0000000..beabb5a
--- /dev/null
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e=0;ba(this.chunks,(function(t){e+=t.progress()*(t.endByte-t.startByte)}));var t=e/this.size;return this._prevProgress=Math.max(this._prevProgress,t>.9999?1:t),this._prevProgress}},{key:"isUploading",value:function(){var e=!1;return ba(this.chunks,(function(t){if("uploading"===t.status())return e=!0,!1})),e}},{key:"isComplete",value:function(){var e=!1;return ba(this.chunks,(function(t){var r=t.status();if("pending"===r||"uploading"===r||"reading"===r||1===t.preprocessState||1===t.readState)return e=!0,!1})),!e}},{key:"sizeUploaded",value:function(){var e=0;return ba(this.chunks,(function(t){e+=t.sizeUploaded()})),e}},{key:"timeRemaining",value:function(){if(this.paused||this.error)return 0;var e=this.size-this.sizeUploaded();return e&&!this.averageSpeed?Number.POSITIVE_INFINITY:e||this.averageSpeed?Math.floor(e/this.averageSpeed):0}},{key:"getType",value:function(){return this.file.type&&this.file.type.split("/")[1]}},{key:"getExtension",value:function(){return this.name.substr(2+(~-this.name.lastIndexOf(".")>>>0)).toLowerCase()}}]),e}();("undefined"!=typeof window?window:"undefined"!=typeof global?global:"undefined"!=typeof self?self:{}).FlowFile=hs;var ps=function(e){c(a,e);var t,r,n=y(a);function a(){return o(this,a),n.apply(this,arguments)}return s(a,[{key:"retry",value:(r=i(regeneratorRuntime.mark((function e(){return regeneratorRuntime.wrap((function(e){for(;;)switch(e.prev=e.next){case 0:return e.next=2,this.bootstrap("retry");case 2:return e.next=4,this.flowObj.upload();case 4:return e.abrupt("return",e.sent);case 5:case"end":return e.stop()}}),e,this)}))),function(){return r.apply(this,arguments)})},{key:"bootstrap",value:(t=i(regeneratorRuntime.mark((function e(){var t,r,n=arguments;return regeneratorRuntime.wrap((function(e){for(;;)switch(e.prev=e.next){case 0:if(t=n.length>0&&void 0!==n[0]?n[0]:null,"function"!=typeof(r=n.length>1&&void 0!==n[1]?n[1]:this.flowObj.opts.initFileFn)){e.next=5;break}return e.next=5,r(this,t);case 5:return this._bootstrap(),e.abrupt("return",this);case 7:case"end":return e.stop()}}),e,this)}))),function(){return t.apply(this,arguments)})},{key:"isReading",value:function(){var e,t=w(this.chunks);try{for(t.s();!(e=t.n()).done;){if("reading"===e.value.status())return!0}}catch(e){t.e(e)}finally{t.f()}return!1}}]),a}(hs),ds=function(e){c(h,e);var t,r,n,a,u,l,f=y(h);function h(e,t){var r;return o(this,h),r=f.call(this,t),h.version="3.0.0-alpha.0",r.supportDirectory=/Chrome/.test(window.navigator.userAgent)||/Firefox/.test(window.navigator.userAgent)||/Edge/.test(window.navigator.userAgent),r.files=[],r.defaults={chunkSize:1048576,forceChunkSize:!1,simultaneousUploads:3,singleFile:!1,fileParameterName:"file",progressCallbacksInterval:500,speedSmoothingFactor:.1,query:{},headers:{},withCredentials:!1,preprocess:null,changeRawDataBeforeSend:null,method:"multipart",testMethod:"GET",uploadMethod:"POST",prioritizeFirstAndLastChunk:!1,allowDuplicateUploads:!1,target:"/",testChunks:!0,generateUniqueIdentifier:null,maxChunkRetries:0,chunkRetryInterval:null,permanentErrors:[404,413,415,500,501],successStatuses:[200,201,202],onDropStopPropagation:!1,initFileFn:null,readFileFn:ya,asyncReadFileFn:null},r.opts={},r.opts=Object.assign({},r.defaults,e||{}),r._onDropBound=null,r}return s(h,[{key:"onDrop",value:function(e){this.opts.onDropStopPropagation&&e.stopPropagation(),e.preventDefault();var t=e.dataTransfer;t.items&&t.items[0]&&t.items[0].webkitGetAsEntry?this.webkitReadDataTransfer(e):this.addFiles(t.files,e)}},{key:"preventEvent",value:function(e){e.preventDefault()}},{key:"webkitReadDataTransfer",value:function(e){var t,r=this,n=e.dataTransfer.items.length,i=function(){0==--n&&r.addFiles(o,e)},o=[],a=w(e.dataTransfer.items);try{for(a.s();!(t=a.n()).done;){var s=t.value,u=s.webkitGetAsEntry();if(!u)return void i();u.isFile?l(s.getAsFile(),u.fullPath):c(u.createReader())}}catch(e){a.e(e)}finally{a.f()}function c(e){e.readEntries((function(t){if(t.length){n+=t.length;var r,o={},a=w(t);try{for(a.s();!(r=a.n()).done;){var s=r.value;s.isFile?(o[s.name]=s.fullPath,s.file((function(e){return l(e,o[e.name])}),f)):s.isDirectory&&c(s.createReader())}}catch(e){a.e(e)}finally{a.f()}c(e)}else i()}),f)}function l(e,t){e.relativePath=t.substring(1),o.push(e),i()}function f(e){throw i(),e}}},{key:"generateUniqueIdentifier",value:(l=i(regeneratorRuntime.mark((function e(t){var r,n;return regeneratorRuntime.wrap((function(e){for(;;)switch(e.prev=e.next){case 0:if("function"!=typeof(r=this.opts.generateUniqueIdentifier)){e.next=5;break}return e.next=4,r(t);case 4:return e.abrupt("return",e.sent);case 5:return n=t.relativePath||t.webkitRelativePath||t.fileName||t.name,e.abrupt("return",t.size+"-"+n.replace(/[^0-9a-zA-Z_-]/gim,""));case 7:case"end":return e.stop()}}),e,this)}))),function(e){return l.apply(this,arguments)})},{key:"uploadNextChunk",value:(u=i(regeneratorRuntime.mark((function e(t){var r,n,i,o,a,s,u,c,l,f,h,p,d;return regeneratorRuntime.wrap((function(e){for(;;)switch(e.prev=e.next){case 0:if(r=!1,!this.opts.prioritizeFirstAndLastChunk){e.next=29;break}n=w(this.files),e.prev=3,n.s();case 5:if((i=n.n()).done){e.next=19;break}if((o=i.value).paused||!o.chunks.length||"pending"!==o.chunks[0].status()){e.next=12;break}return e.next=10,o.chunks[0].send();case 10:return r=!0,e.abrupt("break",19);case 12:if(o.paused||!(o.chunks.length>1)||"pending"!==o.chunks[o.chunks.length-1].status()){e.next=17;break}return e.next=15,o.chunks[o.chunks.length-1].send();case 15:return r=!0,e.abrupt("break",19);case 17:e.next=5;break;case 19:e.next=24;break;case 21:e.prev=21,e.t0=e.catch(3),n.e(e.t0);case 24:return e.prev=24,n.f(),e.finish(24);case 27:if(!r){e.next=29;break}return e.abrupt("return",r);case 29:a=w(this.files),e.prev=30,a.s();case 32:if((s=a.n()).done){e.next=58;break}if(!(u=s.value).paused){e.next=36;break}return e.abrupt("continue",56);case 36:c=w(u.chunks),e.prev=37,c.s();case 39:if((l=c.n()).done){e.next=48;break}if("pending"!==(f=l.value).status()){e.next=46;break}return e.next=44,f.send();case 44:return r=!0,e.abrupt("break",58);case 46:e.next=39;break;case 48:e.next=53;break;case 50:e.prev=50,e.t1=e.catch(37),c.e(e.t1);case 53:return e.prev=53,c.f(),e.finish(53);case 56:e.next=32;break;case 58:e.next=63;break;case 60:e.prev=60,e.t2=e.catch(30),a.e(e.t2);case 63:return e.prev=63,a.f(),e.finish(63);case 66:if(!r){e.next=68;break}return e.abrupt("return",!0);case 68:h=!1,p=w(this.files),e.prev=70,p.s();case 72:if((d=p.n()).done){e.next=79;break}if(d.value.isComplete()){e.next=77;break}return h=!0,e.abrupt("break",79);case 77:e.next=72;break;case 79:e.next=84;break;case 81:e.prev=81,e.t3=e.catch(70),p.e(e.t3);case 84:return e.prev=84,p.f(),e.finish(84);case 87:return h||t||this.emit("complete"),e.abrupt("return",!1);case 89:case"end":return e.stop()}}),e,this,[[3,21,24,27],[30,60,63,66],[37,50,53,56],[70,81,84,87]])}))),function(e){return u.apply(this,arguments)})},{key:"assignBrowse",value:(a=i(regeneratorRuntime.mark((function e(t,r,n,o){return regeneratorRuntime.wrap((function(e){for(;;)switch(e.prev=e.next){case 0:t instanceof Element&&(t=[t]),ba(t,(function(e){var t,a=this;"INPUT"===e.tagName&&"file"===e.type?t=e:((t=document.createElement("input")).setAttribute("type","file"),Object.assign(t.style,{visibility:"hidden",position:"absolute",width:"1px",height:"1px"}),e.appendChild(t),e.addEventListener("click",(function(){t.click()}),!1)),this.opts.singleFile||n||t.setAttribute("multiple","multiple"),r&&t.setAttribute("webkitdirectory","webkitdirectory"),ba(o,(function(e,r){t.setAttribute(r,e)})),t.addEventListener("change",function(){var e=i(regeneratorRuntime.mark((function e(t){return regeneratorRuntime.wrap((function(e){for(;;)switch(e.prev=e.next){case 0:if(!t.target.value){e.next=4;break}return e.next=3,a.addFiles(t.target.files,t);case 3:t.target.value="";case 4:case"end":return e.stop()}}),e)})));return function(t){return e.apply(this,arguments)}}(),!1)}),this);case 2:case"end":return e.stop()}}),e,this)}))),function(e,t,r,n){return a.apply(this,arguments)})},{key:"assignDrop",value:function(e){void 0===e.length&&(e=[e]),this._onDropBound=this.onDrop.bind(this);var t,r=w(e);try{for(r.s();!(t=r.n()).done;){var n=t.value;n.addEventListener("dragover",this.preventEvent,!1),n.addEventListener("dragenter",this.preventEvent,!1),n.addEventListener("drop",this._onDropBound,!1)}}catch(e){r.e(e)}finally{r.f()}}},{key:"unAssignDrop",value:function(e){void 0===e.length&&(e=[e]);var t,r=w(e);try{for(r.s();!(t=r.n()).done;){var n=t.value;n.removeEventListener("dragover",this.preventEvent,!1),n.removeEventListener("dragenter",this.preventEvent,!1),n.removeEventListener("drop",this._onDropBound,!1)}}catch(e){r.e(e)}finally{r.f()}}},{key:"isUploading",value:function(){var e=!1;return ba(this.files,(function(t){if(t.isUploading())return e=!0,!1})),e}},{key:"_shouldUploadNext",value:function(){var e=0,t=!0,r=this.opts.simultaneousUploads;return ba(this.files,(function(n){ba(n.chunks,(function(n){if("uploading"===n.status()&&++e>=r)return t=!1,!1}))})),t&&e}},{key:"upload",value:(n=i(regeneratorRuntime.mark((function e(){var t,r,n;return regeneratorRuntime.wrap((function(e){for(;;)switch(e.prev=e.next){case 0:if(!1!==(t=this._shouldUploadNext())){e.next=3;break}return e.abrupt("return");case 3:this.emit("upload-start"),r=!1,n=1;case 6:if(!(n<=this.opts.simultaneousUploads-t)){e.next=16;break}return e.next=9,this.uploadNextChunk(!0);case 9:if(e.t0=e.sent,e.t0){e.next=12;break}e.t0=r;case 12:r=e.t0;case 13:n++,e.next=6;break;case 16:r||this.emit("complete");case 17:case"end":return e.stop()}}),e,this)}))),function(){return n.apply(this,arguments)})},{key:"resume",value:function(){ba(this.files,(function(e){e.isComplete()||e.resume()}))}},{key:"pause",value:function(){ba(this.files,(function(e){e.pause()}))}},{key:"cancel",value:function(){for(var e=this.files.length-1;e>=0;e--)this.files[e].cancel()}},{key:"progress",value:function(){var e=0,t=0;return ba(this.files,(function(r){e+=r.progress()*r.size,t+=r.size})),t>0?e/t:0}},{key:"addFile",value:(r=i(regeneratorRuntime.mark((function e(t){var r,n,i,o=arguments;return regeneratorRuntime.wrap((function(e){for(;;)switch(e.prev=e.next){case 0:for(r=o.length,n=new Array(r>1?r-1:0),i=1;i<r;i++)n[i-1]=o[i];return e.next=3,this.addFiles.apply(this,[[t]].concat(n));case 3:return e.abrupt("return",e.sent[0]);case 4:case"end":return e.stop()}}),e,this)}))),function(e){return r.apply(this,arguments)})},{key:"addFiles",value:(t=i(regeneratorRuntime.mark((function e(t){var r,n,i,o,a,s,u,c,l,f,h,p,d,v,y,g,b,m=arguments;return regeneratorRuntime.wrap((function(e){for(;;)switch(e.prev=e.next){case 0:r=m.length>1&&void 0!==m[1]?m[1]:null,n=m.length>2&&void 0!==m[2]?m[2]:this.opts.initFileFn,i=[],o=window.navigator.msPointerEnabled,a=w(t),e.prev=5,a.s();case 7:if((s=a.n()).done){e.next=25;break}if(u=s.value,!(o&&0===u.size||u.size%4096==0&&("."===u.name||"."===u.fileName))){e.next=11;break}return e.abrupt("continue",23);case 11:return e.next=13,this.generateUniqueIdentifier(u);case 13:if(c=e.sent,this.opts.allowDuplicateUploads||!this.getFromUniqueIdentifier(c)){e.next=16;break}return e.abrupt("continue",23);case 16:return e.next=18,this.hook("filter-file",u,r);case 18:if(e.sent){e.next=20;break}return e.abrupt("continue",23);case 20:l=new ps(this,u,c),f=l.bootstrap(r,n),i.push(f);case 23:e.next=7;break;case 25:e.next=30;break;case 27:e.prev=27,e.t0=e.catch(5),a.e(e.t0);case 30:return e.prev=30,a.f(),e.finish(30);case 33:return e.next=35,Promise.all(i);case 35:h=e.sent,p=w(h),e.prev=37,p.s();case 39:if((d=p.n()).done){e.next=45;break}return v=d.value,e.next=43,this.hook("file-added",v,r);case 43:e.next=39;break;case 45:e.next=50;break;case 47:e.prev=47,e.t1=e.catch(37),p.e(e.t1);case 50:return e.prev=50,p.f(),e.finish(50);case 53:return h=h.filter((function(e){return e&&e.file})),e.next=56,this.hook("files-added",h,r);case 56:h=h.filter((function(e){return e&&e.file})),y=w(h);try{for(y.s();!(g=y.n()).done;)b=g.value,this.opts.singleFile&&this.files.length>0&&this.removeFile(this.files[0]),this.files.push(b)}catch(e){y.e(e)}finally{y.f()}return e.next=61,this.hook("files-submitted",this.files,r);case 61:return e.abrupt("return",h);case 62:case"end":return e.stop()}}),e,this,[[5,27,30,33],[37,47,50,53]])}))),function(e){return t.apply(this,arguments)})},{key:"removeFile",value:function(e){for(var t=this.files.length-1;t>=0;t--)if(this.files[t]===e){this.files.splice(t,1),e.abort(),this.emit("file-removed",e);break}}},{key:"getFromUniqueIdentifier",value:function(e){var t=!1;return ba(this.files,(function(r){r.uniqueIdentifier===e&&(t=r)})),t}},{key:"getSize",value:function(){var e=0;return ba(this.files,(function(t){e+=t.size})),e}},{key:"sizeUploaded",value:function(){var e=0;return ba(this.files,(function(t){e+=t.sizeUploaded()})),e}},{key:"timeRemaining",value:function(){var e=0,t=0;return ba(this.files,(function(r){r.paused||r.error||(e+=r.size-r.sizeUploaded(),t+=r.averageSpeed)})),e&&!t?Number.POSITIVE_INFINITY:e||t?Math.floor(e/t):0}}]),h}(ta);return ds}));
+//# sourceMappingURL=flow.compat.min.js.map
diff --git a/dist/flow.js b/dist/flow.js
index e0ce962..8f2987e 100644
--- a/dist/flow.js
+++ b/dist/flow.js
@@ -4,6285 +4,995 @@
   (global = typeof globalThis !== 'undefined' ? globalThis : global || self, global.Flow = factory());
 }(this, (function () { 'use strict';
 
-  function _typeof(obj) {
-    "@babel/helpers - typeof";
-
-    if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") {
-      _typeof = function (obj) {
-        return typeof obj;
-      };
-    } else {
-      _typeof = function (obj) {
-        return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
-      };
-    }
+  /**
+   * A base-class (or a mixin) adding support for event-listener and dispatchers.
+   */
 
-    return _typeof(obj);
-  }
+  /**
+   * Hooks exist to allow users to alter flow.js file processing. This is intended for users relying on a dropzone and other higher-level components
+   * when the flow between `addFiles()` and `upload()` is hardly configurable.
+   * Users calling `await flow.addFiles()` have more room for customization before calling `upload();` without having to rely upon hooks.
+   *
+   * Hooks can *alter* the parameters they receive (javascript pass-by-reference rules will apply).
+   * For example, the `file-added` hook receives a `flowfile` parameter. `delete flowfile` or `flowfile = {}` have no effect
+   *  because parent function still hold reference. But `delete flowfile.file` would remove the File() and is supported as a way to
+   *  dequeue a file from a list after its initialization.
+   */
 
-  function asyncGeneratorStep(gen, resolve, reject, _next, _throw, key, arg) {
-    try {
-      var info = gen[key](arg);
-      var value = info.value;
-    } catch (error) {
-      reject(error);
-      return;
-    }
+  const HOOKS = [
+    'file-added',
+    'files-added',
+    'files-submitted',
+  ];
 
-    if (info.done) {
-      resolve(value);
-    } else {
-      Promise.resolve(value).then(_next, _throw);
-    }
-  }
+  /**
+   * Additionally, some hooks are said filtering-hooks.
+   * Code will consider the combined (OR-ed) return value of the callbacks to
+   * decide whether or not keep processing this path/item.
+   */
+  const FILTERING_HOOKS = [
+    'filter-file'
+  ];
 
-  function _asyncToGenerator(fn) {
-    return function () {
-      var self = this,
-          args = arguments;
-      return new Promise(function (resolve, reject) {
-        var gen = fn.apply(self, args);
 
-        function _next(value) {
-          asyncGeneratorStep(gen, resolve, reject, _next, _throw, "next", value);
-        }
+  /**
+   * Events are recognized (case-sensitive) CustomEvent processed using dispatchEvent.
+   * This is a list of those fire by Flow.js, but any name can be attached too.
+   */
+  const EVENTS = [
+    'complete',
+    'error',
+    'file-error',
+    'file-progress',
+    'file-removed',
+    'file-retry',
+    'file-success',
+    'progress',
+    'upload-start',
+  ];
 
-        function _throw(err) {
-          asyncGeneratorStep(gen, resolve, reject, _next, _throw, "throw", err);
-        }
+  /**
+   * This class:
+   * - add EventListener support to an object.
+   * - wrap EventListener attachment in order to ease their removal
+   * - add the concept of processing hooks similar to native events (explained below)
+   *
+   * The file is organized in three parts:
+   * 1. isHook, isFilter, isEvent, on, off
+   *    wrap the above concept and offer a unified interface. Whether a callback
+   *    apply to a hook or an event is determined by its name.
+   *
+   * 2. Events: addEventListener, removeEventListener and *emit()*
+   *    apply to addition/removal/dispatching of *events*.
+   *
+   * 3. Hooks: addHook, hasHook, removeHook apply to addition/removal of *hooks*.
+   *    - *hook()* trigger the hook execution.
+   */
 
-        _next(undefined);
-      });
-    };
-  }
+  EventTarget.prototype._addEventListener = EventTarget.prototype.addEventListener;
+  EventTarget.prototype._removeEventListener = EventTarget.prototype.removeEventListener;
 
-  function _classCallCheck(instance, Constructor) {
-    if (!(instance instanceof Constructor)) {
-      throw new TypeError("Cannot call a class as a function");
-    }
-  }
+  class Eventizer extends EventTarget {
 
-  function _defineProperties(target, props) {
-    for (var i = 0; i < props.length; i++) {
-      var descriptor = props[i];
-      descriptor.enumerable = descriptor.enumerable || false;
-      descriptor.configurable = true;
-      if ("value" in descriptor) descriptor.writable = true;
-      Object.defineProperty(target, descriptor.key, descriptor);
-    }
-  }
+    /**
+     * List of hooks or events:
+     *  key stands for hook or event name
+     *  value array list of callbacks
+     *
+     * Each key is check against an hardcoded to list to defined whether:
+     * - it's a "native" CustomEvent (dispatched asynchronously dirsregarding its value)
+     * - it's a known event (whether a "filter" or an "action")
+     * @type {}
+     */
+    constructor(hooks_events = {}) {
+      super();
 
-  function _createClass(Constructor, protoProps, staticProps) {
-    if (protoProps) _defineProperties(Constructor.prototype, protoProps);
-    if (staticProps) _defineProperties(Constructor, staticProps);
-    return Constructor;
-  }
+      this._events = {};
+      this._hooks = {};
 
-  function _defineProperty(obj, key, value) {
-    if (key in obj) {
-      Object.defineProperty(obj, key, {
-        value: value,
-        enumerable: true,
-        configurable: true,
-        writable: true
-      });
-    } else {
-      obj[key] = value;
+      /**
+       * Hooks and events are distinguished based on the name.
+       * Anything not being a know hook is assumed an event
+       */
+      for (let [name, callbacks] of Object.entries(hooks_events)) {
+        for (let callback of callbacks) {
+          this.on(name, callback);
+        }
+      }
     }
 
-    return obj;
-  }
-
-  function ownKeys(object, enumerableOnly) {
-    var keys = Object.keys(object);
+    isHook(name) {
+      return HOOKS.includes(name) || this.isFilter(name);
+    }
 
-    if (Object.getOwnPropertySymbols) {
-      var symbols = Object.getOwnPropertySymbols(object);
-      if (enumerableOnly) symbols = symbols.filter(function (sym) {
-        return Object.getOwnPropertyDescriptor(object, sym).enumerable;
-      });
-      keys.push.apply(keys, symbols);
+    isFilter(name) {
+      return FILTERING_HOOKS.includes(name);
     }
 
-    return keys;
-  }
+    isEvent(name) {
+      return !this.isHook(name);
+    }
 
-  function _objectSpread2(target) {
-    for (var i = 1; i < arguments.length; i++) {
-      var source = arguments[i] != null ? arguments[i] : {};
+    _camelToDashCase(str) {
+        return str.replace(/[A-Z]/g, letter => `-${letter.toLowerCase()}`);
+    }
 
-      if (i % 2) {
-        ownKeys(Object(source), true).forEach(function (key) {
-          _defineProperty(target, key, source[key]);
-        });
-      } else if (Object.getOwnPropertyDescriptors) {
-        Object.defineProperties(target, Object.getOwnPropertyDescriptors(source));
-      } else {
-        ownKeys(Object(source)).forEach(function (key) {
-          Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key));
-        });
+    /**
+     * A wrapper for addEventListener to alternatively add hooks or events.
+     */
+    on(event, callback, options) {
+      var revent = this._camelToDashCase(event);
+      if (revent != event) {
+        console.warn(`Flow.js v3: Do not rely on camel-case (${event}) event names.`);
+        if (HOOKS.concat(FILTERING_HOOKS, EVENTS).includes(revent)) {
+          event = revent;
+          console.info(`Using "${revent}" instead.`);
+        }
       }
+      return this.isEvent(event)
+        ? this.addEventListener(event, callback, options)
+        : this.addHook(event, callback, options);
     }
 
-    return target;
-  }
-
-  function _inherits(subClass, superClass) {
-    if (typeof superClass !== "function" && superClass !== null) {
-      throw new TypeError("Super expression must either be null or a function");
+    /**
+     * A wrapper for addEventListener to alternatively add hooks or events.
+     */
+    once(event, callback, options) {
+      return this.isEvent(event)
+        ? this.addEventListener(event, callback, {...options, once: true})
+        : console.warn('once() is not implemented for hooks.');
     }
 
-    subClass.prototype = Object.create(superClass && superClass.prototype, {
-      constructor: {
-        value: subClass,
-        writable: true,
-        configurable: true
+    /**
+     * A wrapper for removeEventListener to alternatively remove hooks or events.
+     */
+    off(event, callback, options) {
+      if (this.isEvent(event) || !event) {
+        // console.log(`[event] Remove event listeners...`);
+        this.removeEventListener(event, callback, options);
       }
-    });
-    if (superClass) _setPrototypeOf(subClass, superClass);
-  }
+      if (! this.isEvent(event) || !event) {
+        // console.log(`[event] Remove hooks...`);
+        this.removeHook(event, callback, options);
+      }
+    }
 
-  function _getPrototypeOf(o) {
-    _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) {
-      return o.__proto__ || Object.getPrototypeOf(o);
-    };
-    return _getPrototypeOf(o);
-  }
 
-  function _setPrototypeOf(o, p) {
-    _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) {
-      o.__proto__ = p;
-      return o;
-    };
+    /**
+     * A wrapper around native Target event listeners taken from:
+     * https://github.com/alex2844/js-events
+     *
+     * Return an unbinder() callback, like https://github.com/ai/nanoevents
+     *
+     * @doc: https://developer.mozilla.org/en-US/docs/Web/API/EventTarget
+     */
+    addEventListener(event, callback, options = false) {
+      let _callback = callback,
+          runUnbinder = () => {
+            this.removeEventListener(event, callback, options);
+            _callback.apply(this, arguments);
+          },
+          unbinder = () => {
+            this.removeEventListener(event, callback, options);
+          };
 
-    return _setPrototypeOf(o, p);
-  }
+      if (options && options.once) {
+        callback = runUnbinder;
+      }
 
-  function _isNativeReflectConstruct() {
-    if (typeof Reflect === "undefined" || !Reflect.construct) return false;
-    if (Reflect.construct.sham) return false;
-    if (typeof Proxy === "function") return true;
+      this._addEventListener(event, callback, options);
+      if (!this._events) {
+        this._events = {};
+        Object.defineProperty(this, '_events', { enumerable: false });
+      }
+      if (!this._events[event]) {
+        this._events[event] = [];
+      }
 
-    try {
-      Date.prototype.toString.call(Reflect.construct(Date, [], function () {}));
-      return true;
-    } catch (e) {
-      return false;
-    }
-  }
+      this._events[event].push({
+        listener: callback,
+        useCapture: (((options === true) || (options.capture)) || false),
+        passive: ((options && options.passive) || false),
+        once: ((options && options.once) || false),
+        type: event
+      });
 
-  function _construct(Parent, args, Class) {
-    if (_isNativeReflectConstruct()) {
-      _construct = Reflect.construct;
-    } else {
-      _construct = function _construct(Parent, args, Class) {
-        var a = [null];
-        a.push.apply(a, args);
-        var Constructor = Function.bind.apply(Parent, a);
-        var instance = new Constructor();
-        if (Class) _setPrototypeOf(instance, Class.prototype);
-        return instance;
-      };
+      return unbinder;
     }
 
-    return _construct.apply(null, arguments);
-  }
-
-  function _isNativeFunction(fn) {
-    return Function.toString.call(fn).indexOf("[native code]") !== -1;
-  }
-
-  function _wrapNativeSuper(Class) {
-    var _cache = typeof Map === "function" ? new Map() : undefined;
-
-    _wrapNativeSuper = function _wrapNativeSuper(Class) {
-      if (Class === null || !_isNativeFunction(Class)) return Class;
-
-      if (typeof Class !== "function") {
-        throw new TypeError("Super expression must either be null or a function");
+    removeEventListener(event, callback = null, options = false) {
+      // var callback = e => callback.call(this, ...e.detail);
+      if (callback) {
+        this._removeEventListener(event, callback, options);
       }
 
-      if (typeof _cache !== "undefined") {
-        if (_cache.has(Class)) return _cache.get(Class);
-
-        _cache.set(Class, Wrapper);
+      if (! this._events || (event && !this._events[event])) {
+        return;
       }
 
-      function Wrapper() {
-        return _construct(Class, arguments, _getPrototypeOf(this).constructor);
+      if (! event || event === '*') {
+        for (let name of Object.keys(this._events)) {
+          // console.log('[event] Removing all event listeners');
+          this.removeEventListener(name);
+        }
+        return;
       }
 
-      Wrapper.prototype = Object.create(Class.prototype, {
-        constructor: {
-          value: Wrapper,
-          enumerable: false,
-          writable: true,
-          configurable: true
+      for (const [i, v] of this._events[event].entries()) {
+        if ((!callback || v.listener == callback) && v.useCapture == options) {
+          // console.log(`[event] Removed one callback from "${event}"`);
+          this._events[event].splice(i, 1);
+          if (! callback) {
+            this._removeEventListener(event, v.listener, v);
+          } else {
+            break;
+          }
         }
-      });
-      return _setPrototypeOf(Wrapper, Class);
-    };
-
-    return _wrapNativeSuper(Class);
-  }
+      }
 
-  function _assertThisInitialized(self) {
-    if (self === void 0) {
-      throw new ReferenceError("this hasn't been initialised - super() hasn't been called");
+      if (this._events[event].length == 0) {
+        delete this._events[event];
+      }
     }
 
-    return self;
-  }
+    /**
+     * A wrapper for dispatchEvent handling "catch-all"
+     */
+    async emit(name, ...args) {
+      // console.log(`[event] Fire native event "${name}"${args.length ? ' with ' + args.length + ' arguments' : ''}`);
+      this.dispatchEvent(new CustomEvent(name, {detail: args}));
+      if (name != 'catch-all') {
+        this.emitCatchAll(name, ...args);
+      }
+    }
 
-  function _possibleConstructorReturn(self, call) {
-    if (call && (typeof call === "object" || typeof call === "function")) {
-      return call;
+    async emitCatchAll(name, ...args) {
+      this.dispatchEvent(new CustomEvent('catch-all', {detail: [name, ...args]}));
     }
 
-    return _assertThisInitialized(self);
-  }
+    /**
+     * ### HOOKS ###
+     */
+    addHook(event, callback, options) {
+      var target = this._hooks;
+      if (!target.hasOwnProperty(event)) {
+        target[event] = [];
+      }
+      target[event].push(callback);
+    }
 
-  function _createSuper(Derived) {
-    var hasNativeReflectConstruct = _isNativeReflectConstruct();
+    hasHook(async, events) {
+      events = typeof events === 'string' ? [events] : events || [];
+      var target = this._hooks;
+      for (let [k, v] of Object.entries(target)) {
+        if (events.length > 0 && ! events.includes(k)) {
+          continue;
+        }
+        if (v.length > 0) {
+          return true;
+        }
+      }
 
-    return function _createSuperInternal() {
-      var Super = _getPrototypeOf(Derived),
-          result;
+      return false;
+    }
 
-      if (hasNativeReflectConstruct) {
-        var NewTarget = _getPrototypeOf(this).constructor;
+    /**
+     * Remove one of more hooks' callbacks.
+     */
+    removeHook(event, callback, options) {
+      const arrayRemove = (array, value) => {
+        var index = array.indexOf(value);
+        if (index > -1) {
+          array.splice(index, 1);
+        }
+      };
 
-        result = Reflect.construct(Super, arguments, NewTarget);
+      if (event && event != '*') {
+        if (callback) {
+          var target = this._hooks;
+          if (target.hasOwnProperty(event)) {
+            arrayRemove(target[event], callback);
+          }
+        } else {
+          delete this._hooks[event];
+        }
       } else {
-        result = Super.apply(this, arguments);
+        this._hooks = {};
       }
+    }
 
-      return _possibleConstructorReturn(this, result);
-    };
-  }
-
-  function _slicedToArray(arr, i) {
-    return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _unsupportedIterableToArray(arr, i) || _nonIterableRest();
-  }
-
-  function _arrayWithHoles(arr) {
-    if (Array.isArray(arr)) return arr;
-  }
-
-  function _iterableToArrayLimit(arr, i) {
-    if (typeof Symbol === "undefined" || !(Symbol.iterator in Object(arr))) return;
-    var _arr = [];
-    var _n = true;
-    var _d = false;
-    var _e = undefined;
+    /**
+     * Run an asynchronous hook (action or filter).
+     *
+     * @param {string} event event name
+     * @param {...} args arguments of a callback
+     *
+     * @return {bool} In the case of *filters*, indicates whether processing must continue.
+     * @return {mixed} In the case of *actions*: The first argument (possibly modified by hooks).
+     */
+    async hook(name, ...args) {
+      let calls = this._hooks[name] || [],
+          isFilter = this.isFilter(name),
+          returns;
 
-    try {
-      for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) {
-        _arr.push(_s.value);
+      if (calls.length) {
+        // console.log(`[event] Fire ${calls.length} async hook for "${name}"${args.length ? ' with ' + args.length + ' arguments' : ''}`);
+        returns = await Promise.all(calls.map(e => e.apply(this, args)));
 
-        if (i && _arr.length === i) break;
-      }
-    } catch (err) {
-      _d = true;
-      _e = err;
-    } finally {
-      try {
-        if (!_n && _i["return"] != null) _i["return"]();
-      } finally {
-        if (_d) throw _e;
+        if (isFilter) {
+          returns = returns.includes(true);
+        } else if (name === 'file-added' && returns.includes(false)) {
+          console.warn('In Flow.js 3.x, file-added event is an action rather than a filter. Return value is ignored but removing the `file` property allows to skip an enqueued file.');
+        }
+      } else {
+        returns = isFilter ? true : args[0];
       }
-    }
 
-    return _arr;
-  }
+      this.emitCatchAll(name, ...args);
 
-  function _unsupportedIterableToArray(o, minLen) {
-    if (!o) return;
-    if (typeof o === "string") return _arrayLikeToArray(o, minLen);
-    var n = Object.prototype.toString.call(o).slice(8, -1);
-    if (n === "Object" && o.constructor) n = o.constructor.name;
-    if (n === "Map" || n === "Set") return Array.from(o);
-    if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen);
+      return returns;
+    }
   }
 
-  function _arrayLikeToArray(arr, len) {
-    if (len == null || len > arr.length) len = arr.length;
-
-    for (var i = 0, arr2 = new Array(len); i < len; i++) arr2[i] = arr[i];
+  /**
+   * Default read function using the webAPI
+   *
+   * @function webAPIFileRead(fileObj, startByte, endByte, fileType, chunk)
+   *
+   */
+  function webAPIFileRead(fileObj, startByte, endByte, fileType, chunk) {
+    var function_name = 'slice';
 
-    return arr2;
-  }
+    if (fileObj.file.slice)
+      function_name =  'slice';
+    else if (fileObj.file.mozSlice)
+      function_name = 'mozSlice';
+    else if (fileObj.file.webkitSlice)
+      function_name = 'webkitSlice';
 
-  function _nonIterableRest() {
-    throw new TypeError("Invalid attempt to destructure non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.");
+    chunk.readFinished(fileObj.file[function_name](startByte, endByte, fileType));
   }
 
-  function _createForOfIteratorHelper(o, allowArrayLike) {
-    var it;
-
-    if (typeof Symbol === "undefined" || o[Symbol.iterator] == null) {
-      if (Array.isArray(o) || (it = _unsupportedIterableToArray(o)) || allowArrayLike && o && typeof o.length === "number") {
-        if (it) o = it;
-        var i = 0;
-
-        var F = function () {};
-
-        return {
-          s: F,
-          n: function () {
-            if (i >= o.length) return {
-              done: true
-            };
-            return {
-              done: false,
-              value: o[i++]
-            };
-          },
-          e: function (e) {
-            throw e;
-          },
-          f: F
-        };
-      }
-
-      throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.");
+  /**
+   * If option is a function, evaluate it with given params
+   * @param {*} data
+   * @param {...} args arguments of a callback
+   * @returns {*}
+   */
+  function evalOpts(data, args) {
+    if (typeof data === "function") {
+      // `arguments` is an object, not array, in FF, so:
+      args = Array.prototype.slice.call(arguments);
+      data = data.apply(null, args.slice(1));
     }
-
-    var normalCompletion = true,
-        didErr = false,
-        err;
-    return {
-      s: function () {
-        it = o[Symbol.iterator]();
-      },
-      n: function () {
-        var step = it.next();
-        normalCompletion = step.done;
-        return step;
-      },
-      e: function (e) {
-        didErr = true;
-        err = e;
-      },
-      f: function () {
-        try {
-          if (!normalCompletion && it.return != null) it.return();
-        } finally {
-          if (didErr) throw err;
-        }
-      }
-    };
-  }
-
-  var commonjsGlobal = typeof globalThis !== 'undefined' ? globalThis : typeof window !== 'undefined' ? window : typeof global !== 'undefined' ? global : typeof self !== 'undefined' ? self : {};
-
-  function createCommonjsModule(fn) {
-    var module = { exports: {} };
-  	return fn(module, module.exports), module.exports;
+    return data;
   }
 
-  var check = function check(it) {
-    return it && it.Math == Math && it;
-  }; // https://github.com/zloirock/core-js/issues/86#issuecomment-115759028
-
-
-  var global$1 = // eslint-disable-next-line no-undef
-  check((typeof globalThis === "undefined" ? "undefined" : _typeof(globalThis)) == 'object' && globalThis) || check((typeof window === "undefined" ? "undefined" : _typeof(window)) == 'object' && window) || check((typeof self === "undefined" ? "undefined" : _typeof(self)) == 'object' && self) || check(_typeof(commonjsGlobal) == 'object' && commonjsGlobal) || // eslint-disable-next-line no-new-func
-  function () {
-    return this;
-  }() || Function('return this')();
-
-  var fails = function fails(exec) {
-    try {
-      return !!exec();
-    } catch (error) {
-      return true;
+  /**
+   * Iterate each element of an object
+   * @function
+   * @param {Array|Object} obj object or an array to iterate
+   * @param {Function} callback first argument is a value and second is a key.
+   * @param {Object=} context Object to become context (`this`) for the iterator function.
+   */
+  function each(obj, callback, context) {
+    if (!obj) {
+      return ;
     }
-  };
-
-  var descriptors = !fails(function () {
-    return Object.defineProperty({}, 1, {
-      get: function get() {
-        return 7;
+    var key;
+    // Is Array?
+    // Array.isArray won't work, not only arrays can be iterated by index https://github.com/flowjs/ng-flow/issues/236#
+    if (typeof(obj.length) !== 'undefined') {
+      for (key = 0; key < obj.length; key++) {
+        if (callback.call(context, obj[key], key) === false) {
+          return ;
+        }
       }
-    })[1] != 7;
-  });
-
-  var nativePropertyIsEnumerable = {}.propertyIsEnumerable;
-  var getOwnPropertyDescriptor = Object.getOwnPropertyDescriptor; // Nashorn ~ JDK8 bug
-
-  var NASHORN_BUG = getOwnPropertyDescriptor && !nativePropertyIsEnumerable.call({
-    1: 2
-  }, 1); // `Object.prototype.propertyIsEnumerable` method implementation
-  // https://tc39.es/ecma262/#sec-object.prototype.propertyisenumerable
-
-  var f = NASHORN_BUG ? function propertyIsEnumerable(V) {
-    var descriptor = getOwnPropertyDescriptor(this, V);
-    return !!descriptor && descriptor.enumerable;
-  } : nativePropertyIsEnumerable;
-  var objectPropertyIsEnumerable = {
-    f: f
-  };
-
-  var createPropertyDescriptor = function createPropertyDescriptor(bitmap, value) {
-    return {
-      enumerable: !(bitmap & 1),
-      configurable: !(bitmap & 2),
-      writable: !(bitmap & 4),
-      value: value
-    };
-  };
-
-  var toString = {}.toString;
-
-  var classofRaw = function classofRaw(it) {
-    return toString.call(it).slice(8, -1);
-  };
-
-  var split = ''.split; // fallback for non-array-like ES3 and non-enumerable old V8 strings
-
-  var indexedObject = fails(function () {
-    // throws an error in rhino, see https://github.com/mozilla/rhino/issues/346
-    // eslint-disable-next-line no-prototype-builtins
-    return !Object('z').propertyIsEnumerable(0);
-  }) ? function (it) {
-    return classofRaw(it) == 'String' ? split.call(it, '') : Object(it);
-  } : Object;
-
-  // `RequireObjectCoercible` abstract operation
-  // https://tc39.es/ecma262/#sec-requireobjectcoercible
-  var requireObjectCoercible = function requireObjectCoercible(it) {
-    if (it == undefined) throw TypeError("Can't call method on " + it);
-    return it;
-  };
-
-  var toIndexedObject = function toIndexedObject(it) {
-    return indexedObject(requireObjectCoercible(it));
-  };
-
-  var isObject = function isObject(it) {
-    return _typeof(it) === 'object' ? it !== null : typeof it === 'function';
-  };
-
-  // https://tc39.es/ecma262/#sec-toprimitive
-  // instead of the ES6 spec version, we didn't implement @@toPrimitive case
-  // and the second argument - flag - preferred type is a string
-
-  var toPrimitive = function toPrimitive(input, PREFERRED_STRING) {
-    if (!isObject(input)) return input;
-    var fn, val;
-    if (PREFERRED_STRING && typeof (fn = input.toString) == 'function' && !isObject(val = fn.call(input))) return val;
-    if (typeof (fn = input.valueOf) == 'function' && !isObject(val = fn.call(input))) return val;
-    if (!PREFERRED_STRING && typeof (fn = input.toString) == 'function' && !isObject(val = fn.call(input))) return val;
-    throw TypeError("Can't convert object to primitive value");
-  };
-
-  var hasOwnProperty = {}.hasOwnProperty;
-
-  var has = function has(it, key) {
-    return hasOwnProperty.call(it, key);
-  };
-
-  var document$1 = global$1.document; // typeof document.createElement is 'object' in old IE
-
-  var EXISTS = isObject(document$1) && isObject(document$1.createElement);
-
-  var documentCreateElement = function documentCreateElement(it) {
-    return EXISTS ? document$1.createElement(it) : {};
-  };
-
-  var ie8DomDefine = !descriptors && !fails(function () {
-    return Object.defineProperty(documentCreateElement('div'), 'a', {
-      get: function get() {
-        return 7;
+    } else {
+      for (key in obj) {
+        if (obj.hasOwnProperty(key) && callback.call(context, obj[key], key) === false) {
+          return ;
+        }
       }
-    }).a != 7;
-  });
-
-  var nativeGetOwnPropertyDescriptor = Object.getOwnPropertyDescriptor; // `Object.getOwnPropertyDescriptor` method
-  // https://tc39.es/ecma262/#sec-object.getownpropertydescriptor
-
-  var f$1 = descriptors ? nativeGetOwnPropertyDescriptor : function getOwnPropertyDescriptor(O, P) {
-    O = toIndexedObject(O);
-    P = toPrimitive(P, true);
-    if (ie8DomDefine) try {
-      return nativeGetOwnPropertyDescriptor(O, P);
-    } catch (error) {
-      /* empty */
     }
-    if (has(O, P)) return createPropertyDescriptor(!objectPropertyIsEnumerable.f.call(O, P), O[P]);
-  };
-  var objectGetOwnPropertyDescriptor = {
-    f: f$1
-  };
-
-  var anObject = function anObject(it) {
-    if (!isObject(it)) {
-      throw TypeError(String(it) + ' is not an object');
-    }
-
-    return it;
-  };
-
-  var nativeDefineProperty = Object.defineProperty; // `Object.defineProperty` method
-  // https://tc39.es/ecma262/#sec-object.defineproperty
+  }
 
-  var f$2 = descriptors ? nativeDefineProperty : function defineProperty(O, P, Attributes) {
-    anObject(O);
-    P = toPrimitive(P, true);
-    anObject(Attributes);
-    if (ie8DomDefine) try {
-      return nativeDefineProperty(O, P, Attributes);
-    } catch (error) {
-      /* empty */
-    }
-    if ('get' in Attributes || 'set' in Attributes) throw TypeError('Accessors not supported');
-    if ('value' in Attributes) O[P] = Attributes.value;
-    return O;
-  };
-  var objectDefineProperty = {
-    f: f$2
-  };
-
-  var createNonEnumerableProperty = descriptors ? function (object, key, value) {
-    return objectDefineProperty.f(object, key, createPropertyDescriptor(1, value));
-  } : function (object, key, value) {
-    object[key] = value;
-    return object;
-  };
-
-  var setGlobal = function setGlobal(key, value) {
-    try {
-      createNonEnumerableProperty(global$1, key, value);
-    } catch (error) {
-      global$1[key] = value;
+  /**
+   * Exclusively for test purposes
+   * (Until Grunt+Karma+Jasmine can allow test to use (ES) `import` of tools.js)
+   */
+  var g$1 = typeof window !== 'undefined' ? window
+      : typeof global !== 'undefined' ? global
+      : typeof self !== 'undefined' ? self : {};
+  g$1.evalOpts = evalOpts;
+
+  class DeferredPromise {
+    // https://stackoverflow.com/a/47112177
+    constructor() {
+      this.resolved = false;
+      this._promise = new Promise((resolve, reject) => {
+        // assign the resolve and reject functions to `this`
+        // making them usable on the class instance
+        this.resolve = () => {
+          this.resolved = true;
+          return resolve();
+        };
+        this.reject = reject;
+      });
+      // bind `then` and `catch` to implement the same interface as Promise
+      this.then = this._promise.then.bind(this._promise);
+      this.catch = this._promise.catch.bind(this._promise);
+      this[Symbol.toStringTag] = 'Promise';
     }
-
-    return value;
-  };
-
-  var SHARED = '__core-js_shared__';
-  var store = global$1[SHARED] || setGlobal(SHARED, {});
-  var sharedStore = store;
-
-  var functionToString = Function.toString; // this helper broken in `3.4.1-3.4.4`, so we can't use `shared` helper
-
-  if (typeof sharedStore.inspectSource != 'function') {
-    sharedStore.inspectSource = function (it) {
-      return functionToString.call(it);
-    };
   }
 
-  var inspectSource = sharedStore.inspectSource;
+  /**
+   * Class for storing a single chunk
+   * @name FlowChunk
+   * @param {Flow} flowObj
+   * @param {FlowFile} fileObj
+   * @param {number} offset
+   * @constructor
+   */
+  class FlowChunk {
 
-  var WeakMap = global$1.WeakMap;
-  var nativeWeakMap = typeof WeakMap === 'function' && /native code/.test(inspectSource(WeakMap));
+    constructor(flowObj, fileObj, offset) {
 
-  var shared = createCommonjsModule(function (module) {
-    (module.exports = function (key, value) {
-      return sharedStore[key] || (sharedStore[key] = value !== undefined ? value : {});
-    })('versions', []).push({
-      version: '3.8.3',
-      mode:  'global',
-      copyright: '© 2021 Denis Pushkarev (zloirock.ru)'
-    });
-  });
+      /**
+       * Reference to parent flow object
+       * @type {Flow}
+       */
+      this.flowObj = flowObj;
 
-  var id = 0;
-  var postfix = Math.random();
+      /**
+       * Reference to parent FlowFile object
+       * @type {FlowFile}
+       */
+      this.fileObj = fileObj;
 
-  var uid = function uid(key) {
-    return 'Symbol(' + String(key === undefined ? '' : key) + ')_' + (++id + postfix).toString(36);
-  };
+      /**
+       * File offset
+       * @type {number}
+       */
+      this.offset = offset;
 
-  var keys = shared('keys');
+      /**
+       * Indicates if chunk existence was checked on the server
+       * @type {boolean}
+       */
+      this.tested = false;
 
-  var sharedKey = function sharedKey(key) {
-    return keys[key] || (keys[key] = uid(key));
-  };
+      /**
+       * Number of retries performed
+       * @type {number}
+       */
+      this.retries = 0;
 
-  var hiddenKeys = {};
+      /**
+       * Pending retry
+       * @type {boolean}
+       */
+      this.pendingRetry = false;
 
-  var WeakMap$1 = global$1.WeakMap;
-  var set, get, has$1;
+      /**
+       * Preprocess state
+       * @type {number} 0 = unprocessed, 1 = processing, 2 = finished
+       */
+      this.preprocessState = 0;
 
-  var enforce = function enforce(it) {
-    return has$1(it) ? get(it) : set(it, {});
-  };
+      /**
+       * Read state
+       * @type {number} 0 = not read, 1 = reading, 2 = finished
+       */
+      this.readState = 0;
 
-  var getterFor = function getterFor(TYPE) {
-    return function (it) {
-      var state;
+      /**
+       * The payload.
+       * @type {Blob|string}
+       */
+      this.payload = null;
 
-      if (!isObject(it) || (state = get(it)).type !== TYPE) {
-        throw TypeError('Incompatible receiver, ' + TYPE + ' required');
-      }
+      /**
+       * Mostly for streams: how many bytes were actually read
+       * @type {number} -1 = not read
+       */
+      this.readBytes = -1;
 
-      return state;
-    };
-  };
-
-  if (nativeWeakMap) {
-    var store$1 = sharedStore.state || (sharedStore.state = new WeakMap$1());
-    var wmget = store$1.get;
-    var wmhas = store$1.has;
-    var wmset = store$1.set;
-
-    set = function set(it, metadata) {
-      metadata.facade = it;
-      wmset.call(store$1, it, metadata);
-      return metadata;
-    };
-
-    get = function get(it) {
-      return wmget.call(store$1, it) || {};
-    };
-
-    has$1 = function has(it) {
-      return wmhas.call(store$1, it);
-    };
-  } else {
-    var STATE = sharedKey('state');
-    hiddenKeys[STATE] = true;
-
-    set = function set(it, metadata) {
-      metadata.facade = it;
-      createNonEnumerableProperty(it, STATE, metadata);
-      return metadata;
-    };
-
-    get = function get(it) {
-      return has(it, STATE) ? it[STATE] : {};
-    };
-
-    has$1 = function has$1(it) {
-      return has(it, STATE);
-    };
-  }
+      /**
+       * File-level read state.
+       * When reading from a stream we can't slice a known-size buffer in chunks.
+       * These are constructed sequentially from blocking read. This list stores the
+       * respective Promise status of each chunk.
+       * @type {Promise}
+       */
+      this.readStreamState = new DeferredPromise();
 
-  var internalState = {
-    set: set,
-    get: get,
-    has: has$1,
-    enforce: enforce,
-    getterFor: getterFor
-  };
-
-  var redefine = createCommonjsModule(function (module) {
-    var getInternalState = internalState.get;
-    var enforceInternalState = internalState.enforce;
-    var TEMPLATE = String(String).split('String');
-    (module.exports = function (O, key, value, options) {
-      var unsafe = options ? !!options.unsafe : false;
-      var simple = options ? !!options.enumerable : false;
-      var noTargetGet = options ? !!options.noTargetGet : false;
-      var state;
-
-      if (typeof value == 'function') {
-        if (typeof key == 'string' && !has(value, 'name')) {
-          createNonEnumerableProperty(value, 'name', key);
-        }
+      /**
+       * Bytes transferred from total request size
+       * @type {number}
+       */
+      this.loaded = 0;
 
-        state = enforceInternalState(value);
+      /**
+       * Total request size
+       * @type {number}
+       */
+      this.total = 0;
 
-        if (!state.source) {
-          state.source = TEMPLATE.join(typeof key == 'string' ? key : '');
-        }
-      }
+      /**
+       * Size of a chunk
+       * @type {number}
+       */
+      this.chunkSize = this.fileObj.chunkSize;
 
-      if (O === global$1) {
-        if (simple) O[key] = value;else setGlobal(key, value);
-        return;
-      } else if (!unsafe) {
-        delete O[key];
-      } else if (!noTargetGet && O[key]) {
-        simple = true;
-      }
+      /**
+       * Chunk start byte in a file
+       * @type {number}
+       */
+      this.startByte = this.offset * this.chunkSize;
 
-      if (simple) O[key] = value;else createNonEnumerableProperty(O, key, value); // add fake Function#toString for correct work wrapped methods / constructors with methods like LoDash isNative
-    })(Function.prototype, 'toString', function toString() {
-      return typeof this == 'function' && getInternalState(this).source || inspectSource(this);
-    });
-  });
-
-  var path = global$1;
-
-  var aFunction = function aFunction(variable) {
-    return typeof variable == 'function' ? variable : undefined;
-  };
-
-  var getBuiltIn = function getBuiltIn(namespace, method) {
-    return arguments.length < 2 ? aFunction(path[namespace]) || aFunction(global$1[namespace]) : path[namespace] && path[namespace][method] || global$1[namespace] && global$1[namespace][method];
-  };
-
-  var ceil = Math.ceil;
-  var floor = Math.floor; // `ToInteger` abstract operation
-  // https://tc39.es/ecma262/#sec-tointeger
-
-  var toInteger = function toInteger(argument) {
-    return isNaN(argument = +argument) ? 0 : (argument > 0 ? floor : ceil)(argument);
-  };
-
-  var min = Math.min; // `ToLength` abstract operation
-  // https://tc39.es/ecma262/#sec-tolength
-
-  var toLength = function toLength(argument) {
-    return argument > 0 ? min(toInteger(argument), 0x1FFFFFFFFFFFFF) : 0; // 2 ** 53 - 1 == 9007199254740991
-  };
-
-  var max = Math.max;
-  var min$1 = Math.min; // Helper for a popular repeating case of the spec:
-  // Let integer be ? ToInteger(index).
-  // If integer < 0, let result be max((length + integer), 0); else let result be min(integer, length).
-
-  var toAbsoluteIndex = function toAbsoluteIndex(index, length) {
-    var integer = toInteger(index);
-    return integer < 0 ? max(integer + length, 0) : min$1(integer, length);
-  };
-
-  var createMethod = function createMethod(IS_INCLUDES) {
-    return function ($this, el, fromIndex) {
-      var O = toIndexedObject($this);
-      var length = toLength(O.length);
-      var index = toAbsoluteIndex(fromIndex, length);
-      var value; // Array#includes uses SameValueZero equality algorithm
-      // eslint-disable-next-line no-self-compare
-
-      if (IS_INCLUDES && el != el) while (length > index) {
-        value = O[index++]; // eslint-disable-next-line no-self-compare
-
-        if (value != value) return true; // Array#indexOf ignores holes, Array#includes - not
-      } else for (; length > index; index++) {
-        if ((IS_INCLUDES || index in O) && O[index] === el) return IS_INCLUDES || index || 0;
-      }
-      return !IS_INCLUDES && -1;
-    };
-  };
-
-  var arrayIncludes = {
-    // `Array.prototype.includes` method
-    // https://tc39.es/ecma262/#sec-array.prototype.includes
-    includes: createMethod(true),
-    // `Array.prototype.indexOf` method
-    // https://tc39.es/ecma262/#sec-array.prototype.indexof
-    indexOf: createMethod(false)
-  };
-
-  var indexOf = arrayIncludes.indexOf;
-
-  var objectKeysInternal = function objectKeysInternal(object, names) {
-    var O = toIndexedObject(object);
-    var i = 0;
-    var result = [];
-    var key;
+      /**
+       * A specific filename for this chunk which otherwise default to the main name
+       * @type {string}
+       */
+      this.filename = null;
 
-    for (key in O) {
-      !has(hiddenKeys, key) && has(O, key) && result.push(key);
-    } // Don't enum bug & hidden keys
+      /**
+       * Chunk end byte in a file
+       * @type {number}
+       */
+      this.endByte = this.computeEndByte();
 
+      /**
+       * XMLHttpRequest
+       * @type {XMLHttpRequest}
+       */
+      this.xhr = null;
+    }
 
-    while (names.length > i) {
-      if (has(O, key = names[i++])) {
-        ~indexOf(result, key) || result.push(key);
+    /**
+     * Compute the endbyte in a file
+     *
+     */
+    computeEndByte() {
+      var endByte = Math.min(this.fileObj.size, (this.offset + 1) * this.chunkSize);
+      if (this.fileObj.size - endByte < this.chunkSize && !this.flowObj.opts.forceChunkSize) {
+        // The last chunk will be bigger than the chunk size,
+        // but less than 2 * this.chunkSize
+        endByte = this.fileObj.size;
       }
+      return endByte;
+    }
+
+    /**
+     * Send chunk event
+     * @param event
+     * @param {...} args arguments of a callback
+     */
+    event(event, args) {
+      args = Array.prototype.slice.call(arguments);
+      args.unshift(this);
+      this.fileObj.chunkEvent.apply(this.fileObj, args);
     }
 
-    return result;
-  };
+    /**
+     * Catch progress event
+     * @param {ProgressEvent} event
+     */
+    progressHandler(event) {
+      // console.log(event);
+      if (event.lengthComputable) {
+        this.loaded = event.loaded ;
+        this.total = event.total;
+      }
+      this.event('progress', event);
+    }
 
-  // IE8- don't enum bug keys
-  var enumBugKeys = ['constructor', 'hasOwnProperty', 'isPrototypeOf', 'propertyIsEnumerable', 'toLocaleString', 'toString', 'valueOf'];
+    /**
+     * Catch test event
+     * @param {Event} event
+     */
+    testHandler(event) {
+      var status = this.status(true);
+      if (status === 'error') {
+        this.event(status, this.message());
+        this.flowObj.uploadNextChunk();
+      } else if (status === 'success') {
+        this.tested = true;
+        this.event(status, this.message());
+        this.flowObj.uploadNextChunk();
+      } else if (!this.fileObj.paused) {
+        // Error might be caused by file pause method
+        // Chunks does not exist on the server side
+        this.tested = true;
+        this.send();
+      }
+    }
 
-  var hiddenKeys$1 = enumBugKeys.concat('length', 'prototype'); // `Object.getOwnPropertyNames` method
-  // https://tc39.es/ecma262/#sec-object.getownpropertynames
+    /**
+     * Upload has stopped
+     * @param {Event} event
+     */
+    doneHandler(event) {
+      var status = this.status();
+      if (status === 'success' || status === 'error') {
+        delete this.data;
+        this.event(status, this.message());
+        this.flowObj.uploadNextChunk();
+      } else if (!this.fileObj.paused) {
+        this.event('retry', this.message());
+        this.pendingRetry = true;
+        this.abort();
+        this.retries++;
+        var retryInterval = this.flowObj.opts.chunkRetryInterval;
+        if (retryInterval !== null) {
+          setTimeout(() => this.send(), retryInterval);
+        } else {
+          this.send();
+        }
+      }
+    }
 
-  var f$3 = Object.getOwnPropertyNames || function getOwnPropertyNames(O) {
-    return objectKeysInternal(O, hiddenKeys$1);
-  };
+    /**
+     * Get params for a request
+     * @function
+     */
+    getParams () {
+      return {
+        flowChunkNumber: this.offset + 1,
+        flowChunkSize: this.chunkSize,
+        flowCurrentChunkSize: this.endByte - this.startByte,
+        flowTotalSize: this.fileObj.size,
+        flowIdentifier: this.fileObj.uniqueIdentifier,
+        flowFilename: this.fileObj.name,
+        flowRelativePath: this.fileObj.relativePath,
+        flowTotalChunks: this.fileObj.chunks.length
+      };
+    }
 
-  var objectGetOwnPropertyNames = {
-    f: f$3
-  };
+    /**
+     * Get target option with query params
+     * @function
+     * @param params
+     * @returns {string}
+     */
+    getTarget(target, params){
+      if (params.length == 0) {
+        return target;
+      }
 
-  var f$4 = Object.getOwnPropertySymbols;
-  var objectGetOwnPropertySymbols = {
-    f: f$4
-  };
+      if(target.indexOf('?') < 0) {
+        target += '?';
+      } else {
+        target += '&';
+      }
+      return target + params.join('&');
+    }
 
-  var ownKeys$1 = getBuiltIn('Reflect', 'ownKeys') || function ownKeys(it) {
-    var keys = objectGetOwnPropertyNames.f(anObject(it));
-    var getOwnPropertySymbols = objectGetOwnPropertySymbols.f;
-    return getOwnPropertySymbols ? keys.concat(getOwnPropertySymbols(it)) : keys;
-  };
+    /**
+     * Makes a GET request without any data to see if the chunk has already
+     * been uploaded in a previous session
+     * @function
+     */
+    test() {
+      // Set up request and listen for event
+      this.xhr = new XMLHttpRequest();
+      this.xhr.addEventListener("load", this.testHandler.bind(this), false);
+      this.xhr.addEventListener("error", this.testHandler.bind(this), false);
+      var testMethod = evalOpts(this.flowObj.opts.testMethod, this.fileObj, this);
+      var data = this.prepareXhrRequest(testMethod, true);
+      this.xhr.send(data);
+    }
 
-  var copyConstructorProperties = function copyConstructorProperties(target, source) {
-    var keys = ownKeys$1(source);
-    var defineProperty = objectDefineProperty.f;
-    var getOwnPropertyDescriptor = objectGetOwnPropertyDescriptor.f;
+    /**
+     * Finish preprocess state
+     * @function
+     */
+    async preprocessFinished() {
+      // Re-compute the endByte after the preprocess function to allow an
+      // implementer of preprocess to set the fileObj size
+      this.endByte = this.computeEndByte();
 
-    for (var i = 0; i < keys.length; i++) {
-      var key = keys[i];
-      if (!has(target, key)) defineProperty(target, key, getOwnPropertyDescriptor(source, key));
+      this.preprocessState = 2;
+      await this.send();
     }
-  };
-
-  var replacement = /#|\.prototype\./;
-
-  var isForced = function isForced(feature, detection) {
-    var value = data[normalize(feature)];
-    return value == POLYFILL ? true : value == NATIVE ? false : typeof detection == 'function' ? fails(detection) : !!detection;
-  };
-
-  var normalize = isForced.normalize = function (string) {
-    return String(string).replace(replacement, '.').toLowerCase();
-  };
-
-  var data = isForced.data = {};
-  var NATIVE = isForced.NATIVE = 'N';
-  var POLYFILL = isForced.POLYFILL = 'P';
-  var isForced_1 = isForced;
-
-  var getOwnPropertyDescriptor$1 = objectGetOwnPropertyDescriptor.f;
-  /*
-    options.target      - name of the target object
-    options.global      - target is the global object
-    options.stat        - export as static methods of target
-    options.proto       - export as prototype methods of target
-    options.real        - real prototype method for the `pure` version
-    options.forced      - export even if the native feature is available
-    options.bind        - bind methods to the target, required for the `pure` version
-    options.wrap        - wrap constructors to preventing global pollution, required for the `pure` version
-    options.unsafe      - use the simple assignment of property instead of delete + defineProperty
-    options.sham        - add a flag to not completely full polyfills
-    options.enumerable  - export as enumerable property
-    options.noTargetGet - prevent calling a getter on target
-  */
-
-  var _export = function _export(options, source) {
-    var TARGET = options.target;
-    var GLOBAL = options.global;
-    var STATIC = options.stat;
-    var FORCED, target, key, targetProperty, sourceProperty, descriptor;
-
-    if (GLOBAL) {
-      target = global$1;
-    } else if (STATIC) {
-      target = global$1[TARGET] || setGlobal(TARGET, {});
-    } else {
-      target = (global$1[TARGET] || {}).prototype;
+
+    /**
+     * Finish read state
+     * @function
+     */
+    readFinished(payload) {
+      this.readState = 2;
+      this.payload = payload;
+      this.send();
     }
 
-    if (target) for (key in source) {
-      sourceProperty = source[key];
+    /**
+     * asyncReadFileFn() helper provides the ability of asynchronous read()
+     * Eg: When reading from a ReadableStream.getReader().
+     *
+     * But:
+     * - FlowChunk.send() can be called up to {simultaneousUploads} times.
+     * - Concurrent or misordered read() would result in a corrupted payload.
+     *
+     * This function guards from this: As soon a previous chunk exists and as long as
+     *  this previous chunk is not fully read(), we assume corresponding reader is unavailable
+     *  and wait for it.
+     * @function
+     */
+    async readStreamGuard() {
+      var map = this.fileObj.chunks.map(e => e.readStreamState).slice(0, this.offset);
+      try {
+        await Promise.all(map);
+      } catch(err) {
+        console.error(`Chunk ${this.offset}: Error while waiting for ${map.length} previous chunks being read.`);
+        throw(err);
+      }
+    }
 
-      if (options.noTargetGet) {
-        descriptor = getOwnPropertyDescriptor$1(target, key);
-        targetProperty = descriptor && descriptor.value;
-      } else targetProperty = target[key];
+    async readStreamChunk() {
+      if (this.readStreamState.resolved) {
+        // Requiring to read the same chunk twice is unlikely but may happen (in case of retry a failed upload)
+        // If the bytes are still here (this.payload), then retry the upload...
+        if (this.payload && this.pendingRetry) {
+          console.info(`Retrying chunk ${this.offset} upload`);
+          return this.uploadStreamChunk(this.payload);
+        }
 
-      FORCED = isForced_1(GLOBAL ? key : TARGET + (STATIC ? '.' : '#') + key, options.forced); // contained in target
+        console.warn(`Chunk ${this.offset} already read. xhr initialized = ${this.xhr ? 1 : 0}. payload size = ${this.payload ? this.payload.size : null}. readState = ${this.readState}. retry = ${this.pendingRetry}`);
+        // ... but never try to read that same chunk from the (non-rewindable) stream again or we'd risk
+        // not only misordered chunks but a corrupted file.
+        return null;
+      }
 
-      if (!FORCED && targetProperty !== undefined) {
-        if (_typeof(sourceProperty) === _typeof(targetProperty)) continue;
-        copyConstructorProperties(sourceProperty, targetProperty);
-      } // add a flag to not completely full polyfills
+      this.readState = 1;
+      await this.readStreamGuard();
+      var data, asyncRead = this.flowObj.opts.asyncReadFileFn;
 
+      data = await asyncRead(this.fileObj, this.startByte, this.endByte, this.fileObj.file.type, this);
+      this.readStreamState.resolve();
 
-      if (options.sham || targetProperty && targetProperty.sham) {
-        createNonEnumerableProperty(sourceProperty, 'sham', true);
-      } // extend global
+      // Equivalent to readFinished()
+      this.readState = 2;
 
+      if (data) {
+        this.readBytes = data.size || data.size === 0 ? data.size : -1;
+      }
 
-      redefine(target, key, sourceProperty, options);
+      return this.uploadStreamChunk(data);
     }
-  };
 
-  // https://tc39.es/ecma262/#sec-isarray
-
-  var isArray = Array.isArray || function isArray(arg) {
-    return classofRaw(arg) == 'Array';
-  };
+    async uploadStreamChunk(data) {
+      if (data && data.size > 0) {
+        if (this.fileObj.chunkSize && data.size > this.fileObj.chunkSize) {
+          // This may imply a miscalculation of the total chunk numbers.
+          console.warn(`Chunk ${this.offset}: returned too much data. Got ${data.size}. Expected not more than ${this.flowObj.chunkSize}.`);
+        }
+        this.payload = data;
+        this.xhrSend(data);
+        return;
+      }
 
-  // https://tc39.es/ecma262/#sec-toobject
+      if (this.offset > 0) {
+        // last size of the buffer read for the previous chunk
+        var lastReadBytes = this.fileObj.chunks[this.offset - 1].readBytes;
+        if (lastReadBytes < parseInt(this.chunkSize)) {
+          console.warn(`Chunk ${this.offset} seems superfluous. No byte read() meanwhile previous chunk was only ${lastReadBytes} bytes instead of ${this.chunkSize}`);
+          // The last chunk's buffer wasn't even full. That means the number of chunk may
+          // have been miscomputed and this chunk is superfluous.
+          // We make a fake request so that overall status is "complete" and we can move on
+          // on this FlowFile.
+          this.pendingRetry = false;
+          this.xhr = {readyState: 4, status: 200, abort: e => null };
+          this.doneHandler(null);
+          return;
+        }
+      }
 
-  var toObject = function toObject(argument) {
-    return Object(requireObjectCoercible(argument));
-  };
+      console.warn(`Chunk ${this.offset}: no byte to read()`);
+      this.pendingRetry = false;
+    }
 
-  var createProperty = function createProperty(object, key, value) {
-    var propertyKey = toPrimitive(key);
-    if (propertyKey in object) objectDefineProperty.f(object, propertyKey, createPropertyDescriptor(0, value));else object[propertyKey] = value;
-  };
+    /**
+     * Prepare data (preprocess/read) data then call xhrSend()
+     * @function
+     */
+    async send() {
+      var preprocess = this.flowObj.opts.preprocess;
+      var read = this.flowObj.opts.readFileFn;
+      var asyncRead = this.flowObj.opts.asyncReadFileFn;
 
-  var nativeSymbol = !!Object.getOwnPropertySymbols && !fails(function () {
-    // Chrome 38 Symbol has incorrect toString conversion
-    // eslint-disable-next-line no-undef
-    return !String(Symbol());
-  });
+      if (typeof preprocess === 'function') {
+        switch (this.preprocessState) {
+          case 0:
+            this.preprocessState = 1;
+            preprocess(this);
+            return;
+          case 1:
+            return;
+        }
+      }
 
-  var useSymbolAsUid = nativeSymbol // eslint-disable-next-line no-undef
-  && !Symbol.sham // eslint-disable-next-line no-undef
-  && _typeof(Symbol.iterator) == 'symbol';
+      if (asyncRead) {
+        await this.readStreamChunk();
+        return;
+      }
 
-  var WellKnownSymbolsStore = shared('wks');
-  var _Symbol = global$1.Symbol;
-  var createWellKnownSymbol = useSymbolAsUid ? _Symbol : _Symbol && _Symbol.withoutSetter || uid;
+      switch (this.readState) {
+        case 0:
+          this.readState = 1;
+          read(this.fileObj, this.startByte, this.endByte, this.fileObj.file.type, this);
+          return;
+        case 1:
+          return;
+      }
 
-  var wellKnownSymbol = function wellKnownSymbol(name) {
-    if (!has(WellKnownSymbolsStore, name)) {
-      if (nativeSymbol && has(_Symbol, name)) WellKnownSymbolsStore[name] = _Symbol[name];else WellKnownSymbolsStore[name] = createWellKnownSymbol('Symbol.' + name);
+      this.xhrSend(this.payload);
     }
 
-    return WellKnownSymbolsStore[name];
-  };
-
-  var SPECIES = wellKnownSymbol('species'); // `ArraySpeciesCreate` abstract operation
-  // https://tc39.es/ecma262/#sec-arrayspeciescreate
+    /**
+     * Actually uploads data in a POST call
+     * @function
+     */
+    xhrSend(payload) {
+      if (this.flowObj.opts.testChunks && !this.tested) {
+        this.test();
+        return;
+      }
 
-  var arraySpeciesCreate = function arraySpeciesCreate(originalArray, length) {
-    var C;
+      this.loaded = 0;
+      this.total = 0;
+      this.pendingRetry = false;
 
-    if (isArray(originalArray)) {
-      C = originalArray.constructor; // cross-realm fallback
+      // Set up request and listen for event
+      this.xhr = new XMLHttpRequest();
+      this.xhr.upload.addEventListener('progress', this.progressHandler.bind(this), false);
+      this.xhr.addEventListener('load', this.doneHandler.bind(this), false);
+      this.xhr.addEventListener('error', this.doneHandler.bind(this), false);
 
-      if (typeof C == 'function' && (C === Array || isArray(C.prototype))) C = undefined;else if (isObject(C)) {
-        C = C[SPECIES];
-        if (C === null) C = undefined;
+      var uploadMethod = evalOpts(this.flowObj.opts.uploadMethod, this.fileObj, this);
+      var xhrPayload = this.prepareXhrRequest(uploadMethod, false, this.flowObj.opts.method, payload);
+      var changeRawDataBeforeSend = this.flowObj.opts.changeRawDataBeforeSend;
+      if (typeof changeRawDataBeforeSend === 'function') {
+        xhrPayload = changeRawDataBeforeSend(this, xhrPayload);
       }
+      this.xhr.send(xhrPayload);
     }
 
-    return new (C === undefined ? Array : C)(length === 0 ? 0 : length);
-  };
-
-  var engineUserAgent = getBuiltIn('navigator', 'userAgent') || '';
-
-  var process = global$1.process;
-  var versions = process && process.versions;
-  var v8 = versions && versions.v8;
-  var match, version;
-
-  if (v8) {
-    match = v8.split('.');
-    version = match[0] + match[1];
-  } else if (engineUserAgent) {
-    match = engineUserAgent.match(/Edge\/(\d+)/);
-
-    if (!match || match[1] >= 74) {
-      match = engineUserAgent.match(/Chrome\/(\d+)/);
-      if (match) version = match[1];
+    /**
+     * Abort current xhr request
+     * @function
+     */
+    abort() {
+      if (this.xhr) {
+        this.xhr.abort();
+      }
+      this.xhr = null;
     }
-  }
 
-  var engineV8Version = version && +version;
-
-  var SPECIES$1 = wellKnownSymbol('species');
-
-  var arrayMethodHasSpeciesSupport = function arrayMethodHasSpeciesSupport(METHOD_NAME) {
-    // We can't use this feature detection in V8 since it causes
-    // deoptimization and serious performance degradation
-    // https://github.com/zloirock/core-js/issues/677
-    return engineV8Version >= 51 || !fails(function () {
-      var array = [];
-      var constructor = array.constructor = {};
-
-      constructor[SPECIES$1] = function () {
-        return {
-          foo: 1
-        };
-      };
-
-      return array[METHOD_NAME](Boolean).foo !== 1;
-    });
-  };
-
-  var IS_CONCAT_SPREADABLE = wellKnownSymbol('isConcatSpreadable');
-  var MAX_SAFE_INTEGER = 0x1FFFFFFFFFFFFF;
-  var MAXIMUM_ALLOWED_INDEX_EXCEEDED = 'Maximum allowed index exceeded'; // We can't use this feature detection in V8 since it causes
-  // deoptimization and serious performance degradation
-  // https://github.com/zloirock/core-js/issues/679
-
-  var IS_CONCAT_SPREADABLE_SUPPORT = engineV8Version >= 51 || !fails(function () {
-    var array = [];
-    array[IS_CONCAT_SPREADABLE] = false;
-    return array.concat()[0] !== array;
-  });
-  var SPECIES_SUPPORT = arrayMethodHasSpeciesSupport('concat');
-
-  var isConcatSpreadable = function isConcatSpreadable(O) {
-    if (!isObject(O)) return false;
-    var spreadable = O[IS_CONCAT_SPREADABLE];
-    return spreadable !== undefined ? !!spreadable : isArray(O);
-  };
-
-  var FORCED = !IS_CONCAT_SPREADABLE_SUPPORT || !SPECIES_SUPPORT; // `Array.prototype.concat` method
-  // https://tc39.es/ecma262/#sec-array.prototype.concat
-  // with adding support of @@isConcatSpreadable and @@species
-
-  _export({
-    target: 'Array',
-    proto: true,
-    forced: FORCED
-  }, {
-    concat: function concat(arg) {
-      // eslint-disable-line no-unused-vars
-      var O = toObject(this);
-      var A = arraySpeciesCreate(O, 0);
-      var n = 0;
-      var i, k, length, len, E;
-
-      for (i = -1, length = arguments.length; i < length; i++) {
-        E = i === -1 ? O : arguments[i];
-
-        if (isConcatSpreadable(E)) {
-          len = toLength(E.length);
-          if (n + len > MAX_SAFE_INTEGER) throw TypeError(MAXIMUM_ALLOWED_INDEX_EXCEEDED);
-
-          for (k = 0; k < len; k++, n++) {
-            if (k in E) createProperty(A, n, E[k]);
-          }
+    /**
+     * Retrieve current chunk upload status
+     * @function
+     * @returns {string} 'pending', 'uploading', 'success', 'error'
+     */
+    status(isTest) {
+      if (this.readState === 1) {
+        return 'reading';
+      } else if (this.preprocessState === 1) {
+        // if pending retry then that's effectively the same as actively uploading,
+        // there might just be a slight delay before the retry starts
+        return 'uploading';
+      } else if (!this.xhr || this.pendingRetry) {
+        return 'pending';
+      } else if (this.xhr.readyState < 4) {
+        // Status is really 'OPENED', 'HEADERS_RECEIVED'
+        // or 'LOADING' - meaning that stuff is happening
+        return 'uploading';
+      } else {
+        if (this.flowObj.opts.successStatuses.indexOf(this.xhr.status) > -1) {
+          // HTTP 200, perfect
+          // HTTP 202 Accepted - The request has been accepted for processing, but the processing has not been completed.
+          return 'success';
+        } else if (this.flowObj.opts.permanentErrors.indexOf(this.xhr.status) > -1 ||
+                   !isTest && this.retries >= this.flowObj.opts.maxChunkRetries) {
+          // HTTP 413/415/500/501, permanent error
+          return 'error';
         } else {
-          if (n >= MAX_SAFE_INTEGER) throw TypeError(MAXIMUM_ALLOWED_INDEX_EXCEEDED);
-          createProperty(A, n++, E);
+          // this should never happen, but we'll reset and queue a retry
+          // a likely case for this would be 503 service unavailable
+          this.abort();
+          return 'pending';
         }
       }
-
-      A.length = n;
-      return A;
     }
-  });
 
-  var aFunction$1 = function aFunction(it) {
-    if (typeof it != 'function') {
-      throw TypeError(String(it) + ' is not a function');
+    /**
+     * Get response from xhr request
+     * @function
+     * @returns {String}
+     */
+    message() {
+      return this.xhr ? this.xhr.responseText : '';
     }
 
-    return it;
-  };
-
-  var functionBindContext = function functionBindContext(fn, that, length) {
-    aFunction$1(fn);
-    if (that === undefined) return fn;
-
-    switch (length) {
-      case 0:
-        return function () {
-          return fn.call(that);
-        };
-
-      case 1:
-        return function (a) {
-          return fn.call(that, a);
-        };
-
-      case 2:
-        return function (a, b) {
-          return fn.call(that, a, b);
-        };
-
-      case 3:
-        return function (a, b, c) {
-          return fn.call(that, a, b, c);
-        };
+    /**
+     * Get upload progress
+     * @function
+     * @returns {number}
+     */
+    progress() {
+      if (this.pendingRetry) {
+        return 0;
+      }
+      var s = this.status();
+      if (s === 'success' || s === 'error') {
+        return 1;
+      } else if (s === 'pending') {
+        return 0;
+      } else {
+        return this.total > 0 ? this.loaded / this.total : 0;
+      }
     }
 
-    return function ()
-    /* ...args */
-    {
-      return fn.apply(that, arguments);
-    };
-  };
-
-  var push = [].push; // `Array.prototype.{ forEach, map, filter, some, every, find, findIndex, filterOut }` methods implementation
-
-  var createMethod$1 = function createMethod(TYPE) {
-    var IS_MAP = TYPE == 1;
-    var IS_FILTER = TYPE == 2;
-    var IS_SOME = TYPE == 3;
-    var IS_EVERY = TYPE == 4;
-    var IS_FIND_INDEX = TYPE == 6;
-    var IS_FILTER_OUT = TYPE == 7;
-    var NO_HOLES = TYPE == 5 || IS_FIND_INDEX;
-    return function ($this, callbackfn, that, specificCreate) {
-      var O = toObject($this);
-      var self = indexedObject(O);
-      var boundFunction = functionBindContext(callbackfn, that, 3);
-      var length = toLength(self.length);
-      var index = 0;
-      var create = specificCreate || arraySpeciesCreate;
-      var target = IS_MAP ? create($this, length) : IS_FILTER || IS_FILTER_OUT ? create($this, 0) : undefined;
-      var value, result;
-
-      for (; length > index; index++) {
-        if (NO_HOLES || index in self) {
-          value = self[index];
-          result = boundFunction(value, index, O);
-
-          if (TYPE) {
-            if (IS_MAP) target[index] = result; // map
-            else if (result) switch (TYPE) {
-                case 3:
-                  return true;
-                // some
-
-                case 5:
-                  return value;
-                // find
-
-                case 6:
-                  return index;
-                // findIndex
-
-                case 2:
-                  push.call(target, value);
-                // filter
-              } else switch (TYPE) {
-                case 4:
-                  return false;
-                // every
-
-                case 7:
-                  push.call(target, value);
-                // filterOut
-              }
-          }
-        }
+    /**
+     * Count total size uploaded
+     * @function
+     * @returns {number}
+     */
+    sizeUploaded() {
+      var size = this.endByte - this.startByte;
+      // can't return only chunk.loaded value, because it is bigger than chunk size
+      if (this.status() !== 'success') {
+        size = this.progress() * size;
       }
-
-      return IS_FIND_INDEX ? -1 : IS_SOME || IS_EVERY ? IS_EVERY : target;
-    };
-  };
-
-  var arrayIteration = {
-    // `Array.prototype.forEach` method
-    // https://tc39.es/ecma262/#sec-array.prototype.foreach
-    forEach: createMethod$1(0),
-    // `Array.prototype.map` method
-    // https://tc39.es/ecma262/#sec-array.prototype.map
-    map: createMethod$1(1),
-    // `Array.prototype.filter` method
-    // https://tc39.es/ecma262/#sec-array.prototype.filter
-    filter: createMethod$1(2),
-    // `Array.prototype.some` method
-    // https://tc39.es/ecma262/#sec-array.prototype.some
-    some: createMethod$1(3),
-    // `Array.prototype.every` method
-    // https://tc39.es/ecma262/#sec-array.prototype.every
-    every: createMethod$1(4),
-    // `Array.prototype.find` method
-    // https://tc39.es/ecma262/#sec-array.prototype.find
-    find: createMethod$1(5),
-    // `Array.prototype.findIndex` method
-    // https://tc39.es/ecma262/#sec-array.prototype.findIndex
-    findIndex: createMethod$1(6),
-    // `Array.prototype.filterOut` method
-    // https://github.com/tc39/proposal-array-filtering
-    filterOut: createMethod$1(7)
-  };
-
-  var defineProperty = Object.defineProperty;
-  var cache = {};
-
-  var thrower = function thrower(it) {
-    throw it;
-  };
-
-  var arrayMethodUsesToLength = function arrayMethodUsesToLength(METHOD_NAME, options) {
-    if (has(cache, METHOD_NAME)) return cache[METHOD_NAME];
-    if (!options) options = {};
-    var method = [][METHOD_NAME];
-    var ACCESSORS = has(options, 'ACCESSORS') ? options.ACCESSORS : false;
-    var argument0 = has(options, 0) ? options[0] : thrower;
-    var argument1 = has(options, 1) ? options[1] : undefined;
-    return cache[METHOD_NAME] = !!method && !fails(function () {
-      if (ACCESSORS && !descriptors) return true;
-      var O = {
-        length: -1
-      };
-      if (ACCESSORS) defineProperty(O, 1, {
-        enumerable: true,
-        get: thrower
-      });else O[1] = 1;
-      method.call(O, argument0, argument1);
-    });
-  };
-
-  var $filter = arrayIteration.filter;
-  var HAS_SPECIES_SUPPORT = arrayMethodHasSpeciesSupport('filter'); // Edge 14- issue
-
-  var USES_TO_LENGTH = arrayMethodUsesToLength('filter'); // `Array.prototype.filter` method
-  // https://tc39.es/ecma262/#sec-array.prototype.filter
-  // with adding support of @@species
-
-  _export({
-    target: 'Array',
-    proto: true,
-    forced: !HAS_SPECIES_SUPPORT || !USES_TO_LENGTH
-  }, {
-    filter: function filter(callbackfn
-    /* , thisArg */
-    ) {
-      return $filter(this, callbackfn, arguments.length > 1 ? arguments[1] : undefined);
+      return size;
     }
-  });
-
-  // https://tc39.es/ecma262/#sec-object.keys
 
-  var objectKeys = Object.keys || function keys(O) {
-    return objectKeysInternal(O, enumBugKeys);
-  };
-
-  // https://tc39.es/ecma262/#sec-object.defineproperties
-
-  var objectDefineProperties = descriptors ? Object.defineProperties : function defineProperties(O, Properties) {
-    anObject(O);
-    var keys = objectKeys(Properties);
-    var length = keys.length;
-    var index = 0;
-    var key;
-
-    while (length > index) {
-      objectDefineProperty.f(O, key = keys[index++], Properties[key]);
-    }
+    /**
+     * Prepare Xhr request. Set query, headers and data
+     * @param {string} method GET or POST
+     * @param {bool} isTest is this a test request
+     * @param {string} [paramsMethod] octet or form
+     * @param {Blob} [blob] to send
+     * @returns {FormData|Blob|Null} data to send
+     */
+    prepareXhrRequest(method, isTest, paramsMethod, blob) {
+      // Add data from the query options
+      var query = evalOpts(this.flowObj.opts.query, this.fileObj, this, isTest);
+      query = Object.assign({}, query || {}, this.getParams());
+
+      var target = evalOpts(this.flowObj.opts.target, this.fileObj, this, isTest);
+      var data = null;
+      if (method === 'GET' || paramsMethod === 'octet') {
+        // Add data from the query options
+        var params = [];
+        each(query, function (v, k) {
+          params.push([encodeURIComponent(k), encodeURIComponent(v)].join('='));
+        });
+        target = this.getTarget(target, params);
+        data = blob || null;
+      } else {
+        // Add data from the query options
+        data = new FormData();
+        each(query, function (v, k) {
+          data.append(k, v);
+        });
+        if (typeof blob !== "undefined") {
+          data.append(this.flowObj.opts.fileParameterName, blob, this.filename || this.fileObj.file.name);
+        }
+      }
 
-    return O;
-  };
-
-  var html = getBuiltIn('document', 'documentElement');
-
-  var GT = '>';
-  var LT = '<';
-  var PROTOTYPE = 'prototype';
-  var SCRIPT = 'script';
-  var IE_PROTO = sharedKey('IE_PROTO');
-
-  var EmptyConstructor = function EmptyConstructor() {
-    /* empty */
-  };
-
-  var scriptTag = function scriptTag(content) {
-    return LT + SCRIPT + GT + content + LT + '/' + SCRIPT + GT;
-  }; // Create object with fake `null` prototype: use ActiveX Object with cleared prototype
-
-
-  var NullProtoObjectViaActiveX = function NullProtoObjectViaActiveX(activeXDocument) {
-    activeXDocument.write(scriptTag(''));
-    activeXDocument.close();
-    var temp = activeXDocument.parentWindow.Object;
-    activeXDocument = null; // avoid memory leak
-
-    return temp;
-  }; // Create object with fake `null` prototype: use iframe Object with cleared prototype
-
-
-  var NullProtoObjectViaIFrame = function NullProtoObjectViaIFrame() {
-    // Thrash, waste and sodomy: IE GC bug
-    var iframe = documentCreateElement('iframe');
-    var JS = 'java' + SCRIPT + ':';
-    var iframeDocument;
-    iframe.style.display = 'none';
-    html.appendChild(iframe); // https://github.com/zloirock/core-js/issues/475
-
-    iframe.src = String(JS);
-    iframeDocument = iframe.contentWindow.document;
-    iframeDocument.open();
-    iframeDocument.write(scriptTag('document.F=Object'));
-    iframeDocument.close();
-    return iframeDocument.F;
-  }; // Check for document.domain and active x support
-  // No need to use active x approach when document.domain is not set
-  // see https://github.com/es-shims/es5-shim/issues/150
-  // variation of https://github.com/kitcambridge/es5-shim/commit/4f738ac066346
-  // avoid IE GC bug
-
-
-  var activeXDocument;
-
-  var _NullProtoObject = function NullProtoObject() {
-    try {
-      /* global ActiveXObject */
-      activeXDocument = document.domain && new ActiveXObject('htmlfile');
-    } catch (error) {
-      /* ignore */
-    }
+      this.xhr.open(method, target, true);
+      this.xhr.withCredentials = this.flowObj.opts.withCredentials;
 
-    _NullProtoObject = activeXDocument ? NullProtoObjectViaActiveX(activeXDocument) : NullProtoObjectViaIFrame();
-    var length = enumBugKeys.length;
+      // Add data from header options
+      each(evalOpts(this.flowObj.opts.headers, this.fileObj, this, isTest), function (v, k) {
+        this.xhr.setRequestHeader(k, v);
+      }, this);
 
-    while (length--) {
-      delete _NullProtoObject[PROTOTYPE][enumBugKeys[length]];
+      return data;
     }
-
-    return _NullProtoObject();
-  };
-
-  hiddenKeys[IE_PROTO] = true; // `Object.create` method
-  // https://tc39.es/ecma262/#sec-object.create
-
-  var objectCreate = Object.create || function create(O, Properties) {
-    var result;
-
-    if (O !== null) {
-      EmptyConstructor[PROTOTYPE] = anObject(O);
-      result = new EmptyConstructor();
-      EmptyConstructor[PROTOTYPE] = null; // add "__proto__" for Object.getPrototypeOf polyfill
-
-      result[IE_PROTO] = O;
-    } else result = _NullProtoObject();
-
-    return Properties === undefined ? result : objectDefineProperties(result, Properties);
-  };
-
-  var UNSCOPABLES = wellKnownSymbol('unscopables');
-  var ArrayPrototype = Array.prototype; // Array.prototype[@@unscopables]
-  // https://tc39.es/ecma262/#sec-array.prototype-@@unscopables
-
-  if (ArrayPrototype[UNSCOPABLES] == undefined) {
-    objectDefineProperty.f(ArrayPrototype, UNSCOPABLES, {
-      configurable: true,
-      value: objectCreate(null)
-    });
-  } // add a key to Array.prototype[@@unscopables]
-
-
-  var addToUnscopables = function addToUnscopables(key) {
-    ArrayPrototype[UNSCOPABLES][key] = true;
-  };
-
-  var iterators = {};
-
-  var correctPrototypeGetter = !fails(function () {
-    function F() {
-      /* empty */
-    }
-
-    F.prototype.constructor = null;
-    return Object.getPrototypeOf(new F()) !== F.prototype;
-  });
-
-  var IE_PROTO$1 = sharedKey('IE_PROTO');
-  var ObjectPrototype = Object.prototype; // `Object.getPrototypeOf` method
-  // https://tc39.es/ecma262/#sec-object.getprototypeof
-
-  var objectGetPrototypeOf = correctPrototypeGetter ? Object.getPrototypeOf : function (O) {
-    O = toObject(O);
-    if (has(O, IE_PROTO$1)) return O[IE_PROTO$1];
-
-    if (typeof O.constructor == 'function' && O instanceof O.constructor) {
-      return O.constructor.prototype;
-    }
-
-    return O instanceof Object ? ObjectPrototype : null;
-  };
-
-  var ITERATOR = wellKnownSymbol('iterator');
-  var BUGGY_SAFARI_ITERATORS = false;
-
-  var returnThis = function returnThis() {
-    return this;
-  }; // `%IteratorPrototype%` object
-  // https://tc39.es/ecma262/#sec-%iteratorprototype%-object
-
-
-  var IteratorPrototype, PrototypeOfArrayIteratorPrototype, arrayIterator;
-
-  if ([].keys) {
-    arrayIterator = [].keys(); // Safari 8 has buggy iterators w/o `next`
-
-    if (!('next' in arrayIterator)) BUGGY_SAFARI_ITERATORS = true;else {
-      PrototypeOfArrayIteratorPrototype = objectGetPrototypeOf(objectGetPrototypeOf(arrayIterator));
-      if (PrototypeOfArrayIteratorPrototype !== Object.prototype) IteratorPrototype = PrototypeOfArrayIteratorPrototype;
-    }
-  }
-
-  var NEW_ITERATOR_PROTOTYPE = IteratorPrototype == undefined || fails(function () {
-    var test = {}; // FF44- legacy iterators case
-
-    return IteratorPrototype[ITERATOR].call(test) !== test;
-  });
-  if (NEW_ITERATOR_PROTOTYPE) IteratorPrototype = {}; // 25.1.2.1.1 %IteratorPrototype%[@@iterator]()
-
-  if ( !has(IteratorPrototype, ITERATOR)) {
-    createNonEnumerableProperty(IteratorPrototype, ITERATOR, returnThis);
-  }
-
-  var iteratorsCore = {
-    IteratorPrototype: IteratorPrototype,
-    BUGGY_SAFARI_ITERATORS: BUGGY_SAFARI_ITERATORS
-  };
-
-  var defineProperty$1 = objectDefineProperty.f;
-  var TO_STRING_TAG = wellKnownSymbol('toStringTag');
-
-  var setToStringTag = function setToStringTag(it, TAG, STATIC) {
-    if (it && !has(it = STATIC ? it : it.prototype, TO_STRING_TAG)) {
-      defineProperty$1(it, TO_STRING_TAG, {
-        configurable: true,
-        value: TAG
-      });
-    }
-  };
-
-  var IteratorPrototype$1 = iteratorsCore.IteratorPrototype;
-
-  var returnThis$1 = function returnThis() {
-    return this;
-  };
-
-  var createIteratorConstructor = function createIteratorConstructor(IteratorConstructor, NAME, next) {
-    var TO_STRING_TAG = NAME + ' Iterator';
-    IteratorConstructor.prototype = objectCreate(IteratorPrototype$1, {
-      next: createPropertyDescriptor(1, next)
-    });
-    setToStringTag(IteratorConstructor, TO_STRING_TAG, false);
-    iterators[TO_STRING_TAG] = returnThis$1;
-    return IteratorConstructor;
-  };
-
-  var aPossiblePrototype = function aPossiblePrototype(it) {
-    if (!isObject(it) && it !== null) {
-      throw TypeError("Can't set " + String(it) + ' as a prototype');
-    }
-
-    return it;
-  };
-
-  // https://tc39.es/ecma262/#sec-object.setprototypeof
-  // Works with __proto__ only. Old v8 can't work with null proto objects.
-
-  /* eslint-disable no-proto */
-
-  var objectSetPrototypeOf = Object.setPrototypeOf || ('__proto__' in {} ? function () {
-    var CORRECT_SETTER = false;
-    var test = {};
-    var setter;
-
-    try {
-      setter = Object.getOwnPropertyDescriptor(Object.prototype, '__proto__').set;
-      setter.call(test, []);
-      CORRECT_SETTER = test instanceof Array;
-    } catch (error) {
-      /* empty */
-    }
-
-    return function setPrototypeOf(O, proto) {
-      anObject(O);
-      aPossiblePrototype(proto);
-      if (CORRECT_SETTER) setter.call(O, proto);else O.__proto__ = proto;
-      return O;
-    };
-  }() : undefined);
-
-  var IteratorPrototype$2 = iteratorsCore.IteratorPrototype;
-  var BUGGY_SAFARI_ITERATORS$1 = iteratorsCore.BUGGY_SAFARI_ITERATORS;
-  var ITERATOR$1 = wellKnownSymbol('iterator');
-  var KEYS = 'keys';
-  var VALUES = 'values';
-  var ENTRIES = 'entries';
-
-  var returnThis$2 = function returnThis() {
-    return this;
-  };
-
-  var defineIterator = function defineIterator(Iterable, NAME, IteratorConstructor, next, DEFAULT, IS_SET, FORCED) {
-    createIteratorConstructor(IteratorConstructor, NAME, next);
-
-    var getIterationMethod = function getIterationMethod(KIND) {
-      if (KIND === DEFAULT && defaultIterator) return defaultIterator;
-      if (!BUGGY_SAFARI_ITERATORS$1 && KIND in IterablePrototype) return IterablePrototype[KIND];
-
-      switch (KIND) {
-        case KEYS:
-          return function keys() {
-            return new IteratorConstructor(this, KIND);
-          };
-
-        case VALUES:
-          return function values() {
-            return new IteratorConstructor(this, KIND);
-          };
-
-        case ENTRIES:
-          return function entries() {
-            return new IteratorConstructor(this, KIND);
-          };
-      }
-
-      return function () {
-        return new IteratorConstructor(this);
-      };
-    };
-
-    var TO_STRING_TAG = NAME + ' Iterator';
-    var INCORRECT_VALUES_NAME = false;
-    var IterablePrototype = Iterable.prototype;
-    var nativeIterator = IterablePrototype[ITERATOR$1] || IterablePrototype['@@iterator'] || DEFAULT && IterablePrototype[DEFAULT];
-    var defaultIterator = !BUGGY_SAFARI_ITERATORS$1 && nativeIterator || getIterationMethod(DEFAULT);
-    var anyNativeIterator = NAME == 'Array' ? IterablePrototype.entries || nativeIterator : nativeIterator;
-    var CurrentIteratorPrototype, methods, KEY; // fix native
-
-    if (anyNativeIterator) {
-      CurrentIteratorPrototype = objectGetPrototypeOf(anyNativeIterator.call(new Iterable()));
-
-      if (IteratorPrototype$2 !== Object.prototype && CurrentIteratorPrototype.next) {
-        if ( objectGetPrototypeOf(CurrentIteratorPrototype) !== IteratorPrototype$2) {
-          if (objectSetPrototypeOf) {
-            objectSetPrototypeOf(CurrentIteratorPrototype, IteratorPrototype$2);
-          } else if (typeof CurrentIteratorPrototype[ITERATOR$1] != 'function') {
-            createNonEnumerableProperty(CurrentIteratorPrototype, ITERATOR$1, returnThis$2);
-          }
-        } // Set @@toStringTag to native iterators
-
-
-        setToStringTag(CurrentIteratorPrototype, TO_STRING_TAG, true);
-      }
-    } // fix Array#{values, @@iterator}.name in V8 / FF
-
-
-    if (DEFAULT == VALUES && nativeIterator && nativeIterator.name !== VALUES) {
-      INCORRECT_VALUES_NAME = true;
-
-      defaultIterator = function values() {
-        return nativeIterator.call(this);
-      };
-    } // define iterator
-
-
-    if ( IterablePrototype[ITERATOR$1] !== defaultIterator) {
-      createNonEnumerableProperty(IterablePrototype, ITERATOR$1, defaultIterator);
-    }
-
-    iterators[NAME] = defaultIterator; // export additional methods
-
-    if (DEFAULT) {
-      methods = {
-        values: getIterationMethod(VALUES),
-        keys: IS_SET ? defaultIterator : getIterationMethod(KEYS),
-        entries: getIterationMethod(ENTRIES)
-      };
-      if (FORCED) for (KEY in methods) {
-        if (BUGGY_SAFARI_ITERATORS$1 || INCORRECT_VALUES_NAME || !(KEY in IterablePrototype)) {
-          redefine(IterablePrototype, KEY, methods[KEY]);
-        }
-      } else _export({
-        target: NAME,
-        proto: true,
-        forced: BUGGY_SAFARI_ITERATORS$1 || INCORRECT_VALUES_NAME
-      }, methods);
-    }
-
-    return methods;
-  };
-
-  var ARRAY_ITERATOR = 'Array Iterator';
-  var setInternalState = internalState.set;
-  var getInternalState = internalState.getterFor(ARRAY_ITERATOR); // `Array.prototype.entries` method
-  // https://tc39.es/ecma262/#sec-array.prototype.entries
-  // `Array.prototype.keys` method
-  // https://tc39.es/ecma262/#sec-array.prototype.keys
-  // `Array.prototype.values` method
-  // https://tc39.es/ecma262/#sec-array.prototype.values
-  // `Array.prototype[@@iterator]` method
-  // https://tc39.es/ecma262/#sec-array.prototype-@@iterator
-  // `CreateArrayIterator` internal method
-  // https://tc39.es/ecma262/#sec-createarrayiterator
-
-  var es_array_iterator = defineIterator(Array, 'Array', function (iterated, kind) {
-    setInternalState(this, {
-      type: ARRAY_ITERATOR,
-      target: toIndexedObject(iterated),
-      // target
-      index: 0,
-      // next index
-      kind: kind // kind
-
-    }); // `%ArrayIteratorPrototype%.next` method
-    // https://tc39.es/ecma262/#sec-%arrayiteratorprototype%.next
-  }, function () {
-    var state = getInternalState(this);
-    var target = state.target;
-    var kind = state.kind;
-    var index = state.index++;
-
-    if (!target || index >= target.length) {
-      state.target = undefined;
-      return {
-        value: undefined,
-        done: true
-      };
-    }
-
-    if (kind == 'keys') return {
-      value: index,
-      done: false
-    };
-    if (kind == 'values') return {
-      value: target[index],
-      done: false
-    };
-    return {
-      value: [index, target[index]],
-      done: false
-    };
-  }, 'values'); // argumentsList[@@iterator] is %ArrayProto_values%
-  // https://tc39.es/ecma262/#sec-createunmappedargumentsobject
-  // https://tc39.es/ecma262/#sec-createmappedargumentsobject
-
-  iterators.Arguments = iterators.Array; // https://tc39.es/ecma262/#sec-array.prototype-@@unscopables
-
-  addToUnscopables('keys');
-  addToUnscopables('values');
-  addToUnscopables('entries');
-
-  var HAS_SPECIES_SUPPORT$1 = arrayMethodHasSpeciesSupport('splice');
-  var USES_TO_LENGTH$1 = arrayMethodUsesToLength('splice', {
-    ACCESSORS: true,
-    0: 0,
-    1: 2
-  });
-  var max$1 = Math.max;
-  var min$2 = Math.min;
-  var MAX_SAFE_INTEGER$1 = 0x1FFFFFFFFFFFFF;
-  var MAXIMUM_ALLOWED_LENGTH_EXCEEDED = 'Maximum allowed length exceeded'; // `Array.prototype.splice` method
-  // https://tc39.es/ecma262/#sec-array.prototype.splice
-  // with adding support of @@species
-
-  _export({
-    target: 'Array',
-    proto: true,
-    forced: !HAS_SPECIES_SUPPORT$1 || !USES_TO_LENGTH$1
-  }, {
-    splice: function splice(start, deleteCount
-    /* , ...items */
-    ) {
-      var O = toObject(this);
-      var len = toLength(O.length);
-      var actualStart = toAbsoluteIndex(start, len);
-      var argumentsLength = arguments.length;
-      var insertCount, actualDeleteCount, A, k, from, to;
-
-      if (argumentsLength === 0) {
-        insertCount = actualDeleteCount = 0;
-      } else if (argumentsLength === 1) {
-        insertCount = 0;
-        actualDeleteCount = len - actualStart;
-      } else {
-        insertCount = argumentsLength - 2;
-        actualDeleteCount = min$2(max$1(toInteger(deleteCount), 0), len - actualStart);
-      }
-
-      if (len + insertCount - actualDeleteCount > MAX_SAFE_INTEGER$1) {
-        throw TypeError(MAXIMUM_ALLOWED_LENGTH_EXCEEDED);
-      }
-
-      A = arraySpeciesCreate(O, actualDeleteCount);
-
-      for (k = 0; k < actualDeleteCount; k++) {
-        from = actualStart + k;
-        if (from in O) createProperty(A, k, O[from]);
-      }
-
-      A.length = actualDeleteCount;
-
-      if (insertCount < actualDeleteCount) {
-        for (k = actualStart; k < len - actualDeleteCount; k++) {
-          from = k + actualDeleteCount;
-          to = k + insertCount;
-          if (from in O) O[to] = O[from];else delete O[to];
-        }
-
-        for (k = len; k > len - actualDeleteCount + insertCount; k--) {
-          delete O[k - 1];
-        }
-      } else if (insertCount > actualDeleteCount) {
-        for (k = len - actualDeleteCount; k > actualStart; k--) {
-          from = k + actualDeleteCount - 1;
-          to = k + insertCount - 1;
-          if (from in O) O[to] = O[from];else delete O[to];
-        }
-      }
-
-      for (k = 0; k < insertCount; k++) {
-        O[k + actualStart] = arguments[k + 2];
-      }
-
-      O.length = len - actualDeleteCount + insertCount;
-      return A;
-    }
-  });
-
-  var defineProperty$2 = objectDefineProperty.f;
-  var FunctionPrototype = Function.prototype;
-  var FunctionPrototypeToString = FunctionPrototype.toString;
-  var nameRE = /^\s*function ([^ (]*)/;
-  var NAME = 'name'; // Function instances `.name` property
-  // https://tc39.es/ecma262/#sec-function-instances-name
-
-  if (descriptors && !(NAME in FunctionPrototype)) {
-    defineProperty$2(FunctionPrototype, NAME, {
-      configurable: true,
-      get: function get() {
-        try {
-          return FunctionPrototypeToString.call(this).match(nameRE)[1];
-        } catch (error) {
-          return '';
-        }
-      }
-    });
-  }
-
-  var inheritIfRequired = function inheritIfRequired($this, dummy, Wrapper) {
-    var NewTarget, NewTargetPrototype;
-    if ( // it can work only with native `setPrototypeOf`
-    objectSetPrototypeOf && // we haven't completely correct pre-ES6 way for getting `new.target`, so use this
-    typeof (NewTarget = dummy.constructor) == 'function' && NewTarget !== Wrapper && isObject(NewTargetPrototype = NewTarget.prototype) && NewTargetPrototype !== Wrapper.prototype) objectSetPrototypeOf($this, NewTargetPrototype);
-    return $this;
-  };
-
-  // a string of all valid unicode whitespaces
-  // eslint-disable-next-line max-len
-  var whitespaces = "\t\n\x0B\f\r \xA0\u1680\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u202F\u205F\u3000\u2028\u2029\uFEFF";
-
-  var whitespace = '[' + whitespaces + ']';
-  var ltrim = RegExp('^' + whitespace + whitespace + '*');
-  var rtrim = RegExp(whitespace + whitespace + '*$'); // `String.prototype.{ trim, trimStart, trimEnd, trimLeft, trimRight }` methods implementation
-
-  var createMethod$2 = function createMethod(TYPE) {
-    return function ($this) {
-      var string = String(requireObjectCoercible($this));
-      if (TYPE & 1) string = string.replace(ltrim, '');
-      if (TYPE & 2) string = string.replace(rtrim, '');
-      return string;
-    };
-  };
-
-  var stringTrim = {
-    // `String.prototype.{ trimLeft, trimStart }` methods
-    // https://tc39.es/ecma262/#sec-string.prototype.trimstart
-    start: createMethod$2(1),
-    // `String.prototype.{ trimRight, trimEnd }` methods
-    // https://tc39.es/ecma262/#sec-string.prototype.trimend
-    end: createMethod$2(2),
-    // `String.prototype.trim` method
-    // https://tc39.es/ecma262/#sec-string.prototype.trim
-    trim: createMethod$2(3)
-  };
-
-  var getOwnPropertyNames = objectGetOwnPropertyNames.f;
-  var getOwnPropertyDescriptor$2 = objectGetOwnPropertyDescriptor.f;
-  var defineProperty$3 = objectDefineProperty.f;
-  var trim = stringTrim.trim;
-  var NUMBER = 'Number';
-  var NativeNumber = global$1[NUMBER];
-  var NumberPrototype = NativeNumber.prototype; // Opera ~12 has broken Object#toString
-
-  var BROKEN_CLASSOF = classofRaw(objectCreate(NumberPrototype)) == NUMBER; // `ToNumber` abstract operation
-  // https://tc39.es/ecma262/#sec-tonumber
-
-  var toNumber = function toNumber(argument) {
-    var it = toPrimitive(argument, false);
-    var first, third, radix, maxCode, digits, length, index, code;
-
-    if (typeof it == 'string' && it.length > 2) {
-      it = trim(it);
-      first = it.charCodeAt(0);
-
-      if (first === 43 || first === 45) {
-        third = it.charCodeAt(2);
-        if (third === 88 || third === 120) return NaN; // Number('+0x1') should be NaN, old V8 fix
-      } else if (first === 48) {
-        switch (it.charCodeAt(1)) {
-          case 66:
-          case 98:
-            radix = 2;
-            maxCode = 49;
-            break;
-          // fast equal of /^0b[01]+$/i
-
-          case 79:
-          case 111:
-            radix = 8;
-            maxCode = 55;
-            break;
-          // fast equal of /^0o[0-7]+$/i
-
-          default:
-            return +it;
-        }
-
-        digits = it.slice(2);
-        length = digits.length;
-
-        for (index = 0; index < length; index++) {
-          code = digits.charCodeAt(index); // parseInt parses a string to a first unavailable symbol
-          // but ToNumber should return NaN if a string contains unavailable symbols
-
-          if (code < 48 || code > maxCode) return NaN;
-        }
-
-        return parseInt(digits, radix);
-      }
-    }
-
-    return +it;
-  }; // `Number` constructor
-  // https://tc39.es/ecma262/#sec-number-constructor
-
-
-  if (isForced_1(NUMBER, !NativeNumber(' 0o1') || !NativeNumber('0b1') || NativeNumber('+0x1'))) {
-    var NumberWrapper = function Number(value) {
-      var it = arguments.length < 1 ? 0 : value;
-      var dummy = this;
-      return dummy instanceof NumberWrapper // check on 1..constructor(foo) case
-      && (BROKEN_CLASSOF ? fails(function () {
-        NumberPrototype.valueOf.call(dummy);
-      }) : classofRaw(dummy) != NUMBER) ? inheritIfRequired(new NativeNumber(toNumber(it)), dummy, NumberWrapper) : toNumber(it);
-    };
-
-    for (var keys$1 = descriptors ? getOwnPropertyNames(NativeNumber) : ( // ES3:
-    'MAX_VALUE,MIN_VALUE,NaN,NEGATIVE_INFINITY,POSITIVE_INFINITY,' + // ES2015 (in case, if modules with ES2015 Number statics required before):
-    'EPSILON,isFinite,isInteger,isNaN,isSafeInteger,MAX_SAFE_INTEGER,' + 'MIN_SAFE_INTEGER,parseFloat,parseInt,isInteger,' + // ESNext
-    'fromString,range').split(','), j = 0, key; keys$1.length > j; j++) {
-      if (has(NativeNumber, key = keys$1[j]) && !has(NumberWrapper, key)) {
-        defineProperty$3(NumberWrapper, key, getOwnPropertyDescriptor$2(NativeNumber, key));
-      }
-    }
-
-    NumberWrapper.prototype = NumberPrototype;
-    NumberPrototype.constructor = NumberWrapper;
-    redefine(global$1, NUMBER, NumberWrapper);
-  }
-
-  var nativeAssign = Object.assign;
-  var defineProperty$4 = Object.defineProperty; // `Object.assign` method
-  // https://tc39.es/ecma262/#sec-object.assign
-
-  var objectAssign = !nativeAssign || fails(function () {
-    // should have correct order of operations (Edge bug)
-    if (descriptors && nativeAssign({
-      b: 1
-    }, nativeAssign(defineProperty$4({}, 'a', {
-      enumerable: true,
-      get: function get() {
-        defineProperty$4(this, 'b', {
-          value: 3,
-          enumerable: false
-        });
-      }
-    }), {
-      b: 2
-    })).b !== 1) return true; // should work with symbols and should have deterministic property order (V8 bug)
-
-    var A = {};
-    var B = {}; // eslint-disable-next-line no-undef
-
-    var symbol = Symbol();
-    var alphabet = 'abcdefghijklmnopqrst';
-    A[symbol] = 7;
-    alphabet.split('').forEach(function (chr) {
-      B[chr] = chr;
-    });
-    return nativeAssign({}, A)[symbol] != 7 || objectKeys(nativeAssign({}, B)).join('') != alphabet;
-  }) ? function assign(target, source) {
-    // eslint-disable-line no-unused-vars
-    var T = toObject(target);
-    var argumentsLength = arguments.length;
-    var index = 1;
-    var getOwnPropertySymbols = objectGetOwnPropertySymbols.f;
-    var propertyIsEnumerable = objectPropertyIsEnumerable.f;
-
-    while (argumentsLength > index) {
-      var S = indexedObject(arguments[index++]);
-      var keys = getOwnPropertySymbols ? objectKeys(S).concat(getOwnPropertySymbols(S)) : objectKeys(S);
-      var length = keys.length;
-      var j = 0;
-      var key;
-
-      while (length > j) {
-        key = keys[j++];
-        if (!descriptors || propertyIsEnumerable.call(S, key)) T[key] = S[key];
-      }
-    }
-
-    return T;
-  } : nativeAssign;
-
-  // https://tc39.es/ecma262/#sec-object.assign
-
-  _export({
-    target: 'Object',
-    stat: true,
-    forced: Object.assign !== objectAssign
-  }, {
-    assign: objectAssign
-  });
-
-  var TO_STRING_TAG$1 = wellKnownSymbol('toStringTag');
-  var test = {};
-  test[TO_STRING_TAG$1] = 'z';
-  var toStringTagSupport = String(test) === '[object z]';
-
-  var TO_STRING_TAG$2 = wellKnownSymbol('toStringTag'); // ES3 wrong here
-
-  var CORRECT_ARGUMENTS = classofRaw(function () {
-    return arguments;
-  }()) == 'Arguments'; // fallback for IE11 Script Access Denied error
-
-  var tryGet = function tryGet(it, key) {
-    try {
-      return it[key];
-    } catch (error) {
-      /* empty */
-    }
-  }; // getting tag from ES6+ `Object.prototype.toString`
-
-
-  var classof = toStringTagSupport ? classofRaw : function (it) {
-    var O, tag, result;
-    return it === undefined ? 'Undefined' : it === null ? 'Null' // @@toStringTag case
-    : typeof (tag = tryGet(O = Object(it), TO_STRING_TAG$2)) == 'string' ? tag // builtinTag case
-    : CORRECT_ARGUMENTS ? classofRaw(O) // ES3 arguments fallback
-    : (result = classofRaw(O)) == 'Object' && typeof O.callee == 'function' ? 'Arguments' : result;
-  };
-
-  // https://tc39.es/ecma262/#sec-object.prototype.tostring
-
-
-  var objectToString = toStringTagSupport ? {}.toString : function toString() {
-    return '[object ' + classof(this) + ']';
-  };
-
-  // https://tc39.es/ecma262/#sec-object.prototype.tostring
-
-  if (!toStringTagSupport) {
-    redefine(Object.prototype, 'toString', objectToString, {
-      unsafe: true
-    });
-  }
-
-  var nativePromiseConstructor = global$1.Promise;
-
-  var redefineAll = function redefineAll(target, src, options) {
-    for (var key in src) {
-      redefine(target, key, src[key], options);
-    }
-
-    return target;
-  };
-
-  var SPECIES$2 = wellKnownSymbol('species');
-
-  var setSpecies = function setSpecies(CONSTRUCTOR_NAME) {
-    var Constructor = getBuiltIn(CONSTRUCTOR_NAME);
-    var defineProperty = objectDefineProperty.f;
-
-    if (descriptors && Constructor && !Constructor[SPECIES$2]) {
-      defineProperty(Constructor, SPECIES$2, {
-        configurable: true,
-        get: function get() {
-          return this;
-        }
-      });
-    }
-  };
-
-  var anInstance = function anInstance(it, Constructor, name) {
-    if (!(it instanceof Constructor)) {
-      throw TypeError('Incorrect ' + (name ? name + ' ' : '') + 'invocation');
-    }
-
-    return it;
-  };
-
-  var ITERATOR$2 = wellKnownSymbol('iterator');
-  var ArrayPrototype$1 = Array.prototype; // check on default Array iterator
-
-  var isArrayIteratorMethod = function isArrayIteratorMethod(it) {
-    return it !== undefined && (iterators.Array === it || ArrayPrototype$1[ITERATOR$2] === it);
-  };
-
-  var ITERATOR$3 = wellKnownSymbol('iterator');
-
-  var getIteratorMethod = function getIteratorMethod(it) {
-    if (it != undefined) return it[ITERATOR$3] || it['@@iterator'] || iterators[classof(it)];
-  };
-
-  var iteratorClose = function iteratorClose(iterator) {
-    var returnMethod = iterator['return'];
-
-    if (returnMethod !== undefined) {
-      return anObject(returnMethod.call(iterator)).value;
-    }
-  };
-
-  var Result = function Result(stopped, result) {
-    this.stopped = stopped;
-    this.result = result;
-  };
-
-  var iterate = function iterate(iterable, unboundFunction, options) {
-    var that = options && options.that;
-    var AS_ENTRIES = !!(options && options.AS_ENTRIES);
-    var IS_ITERATOR = !!(options && options.IS_ITERATOR);
-    var INTERRUPTED = !!(options && options.INTERRUPTED);
-    var fn = functionBindContext(unboundFunction, that, 1 + AS_ENTRIES + INTERRUPTED);
-    var iterator, iterFn, index, length, result, next, step;
-
-    var stop = function stop(condition) {
-      if (iterator) iteratorClose(iterator);
-      return new Result(true, condition);
-    };
-
-    var callFn = function callFn(value) {
-      if (AS_ENTRIES) {
-        anObject(value);
-        return INTERRUPTED ? fn(value[0], value[1], stop) : fn(value[0], value[1]);
-      }
-
-      return INTERRUPTED ? fn(value, stop) : fn(value);
-    };
-
-    if (IS_ITERATOR) {
-      iterator = iterable;
-    } else {
-      iterFn = getIteratorMethod(iterable);
-      if (typeof iterFn != 'function') throw TypeError('Target is not iterable'); // optimisation for array iterators
-
-      if (isArrayIteratorMethod(iterFn)) {
-        for (index = 0, length = toLength(iterable.length); length > index; index++) {
-          result = callFn(iterable[index]);
-          if (result && result instanceof Result) return result;
-        }
-
-        return new Result(false);
-      }
-
-      iterator = iterFn.call(iterable);
-    }
-
-    next = iterator.next;
-
-    while (!(step = next.call(iterator)).done) {
-      try {
-        result = callFn(step.value);
-      } catch (error) {
-        iteratorClose(iterator);
-        throw error;
-      }
-
-      if (_typeof(result) == 'object' && result && result instanceof Result) return result;
-    }
-
-    return new Result(false);
-  };
-
-  var ITERATOR$4 = wellKnownSymbol('iterator');
-  var SAFE_CLOSING = false;
-
-  try {
-    var called = 0;
-    var iteratorWithReturn = {
-      next: function next() {
-        return {
-          done: !!called++
-        };
-      },
-      'return': function _return() {
-        SAFE_CLOSING = true;
-      }
-    };
-
-    iteratorWithReturn[ITERATOR$4] = function () {
-      return this;
-    }; // eslint-disable-next-line no-throw-literal
-
-
-    Array.from(iteratorWithReturn, function () {
-      throw 2;
-    });
-  } catch (error) {
-    /* empty */
-  }
-
-  var checkCorrectnessOfIteration = function checkCorrectnessOfIteration(exec, SKIP_CLOSING) {
-    if (!SKIP_CLOSING && !SAFE_CLOSING) return false;
-    var ITERATION_SUPPORT = false;
-
-    try {
-      var object = {};
-
-      object[ITERATOR$4] = function () {
-        return {
-          next: function next() {
-            return {
-              done: ITERATION_SUPPORT = true
-            };
-          }
-        };
-      };
-
-      exec(object);
-    } catch (error) {
-      /* empty */
-    }
-
-    return ITERATION_SUPPORT;
-  };
-
-  var SPECIES$3 = wellKnownSymbol('species'); // `SpeciesConstructor` abstract operation
-  // https://tc39.es/ecma262/#sec-speciesconstructor
-
-  var speciesConstructor = function speciesConstructor(O, defaultConstructor) {
-    var C = anObject(O).constructor;
-    var S;
-    return C === undefined || (S = anObject(C)[SPECIES$3]) == undefined ? defaultConstructor : aFunction$1(S);
-  };
-
-  var engineIsIos = /(iphone|ipod|ipad).*applewebkit/i.test(engineUserAgent);
-
-  var engineIsNode = classofRaw(global$1.process) == 'process';
-
-  var location = global$1.location;
-  var set$1 = global$1.setImmediate;
-  var clear = global$1.clearImmediate;
-  var process$1 = global$1.process;
-  var MessageChannel = global$1.MessageChannel;
-  var Dispatch = global$1.Dispatch;
-  var counter = 0;
-  var queue = {};
-  var ONREADYSTATECHANGE = 'onreadystatechange';
-  var defer, channel, port;
-
-  var run = function run(id) {
-    // eslint-disable-next-line no-prototype-builtins
-    if (queue.hasOwnProperty(id)) {
-      var fn = queue[id];
-      delete queue[id];
-      fn();
-    }
-  };
-
-  var runner = function runner(id) {
-    return function () {
-      run(id);
-    };
-  };
-
-  var listener = function listener(event) {
-    run(event.data);
-  };
-
-  var post = function post(id) {
-    // old engines have not location.origin
-    global$1.postMessage(id + '', location.protocol + '//' + location.host);
-  }; // Node.js 0.9+ & IE10+ has setImmediate, otherwise:
-
-
-  if (!set$1 || !clear) {
-    set$1 = function setImmediate(fn) {
-      var args = [];
-      var i = 1;
-
-      while (arguments.length > i) {
-        args.push(arguments[i++]);
-      }
-
-      queue[++counter] = function () {
-        // eslint-disable-next-line no-new-func
-        (typeof fn == 'function' ? fn : Function(fn)).apply(undefined, args);
-      };
-
-      defer(counter);
-      return counter;
-    };
-
-    clear = function clearImmediate(id) {
-      delete queue[id];
-    }; // Node.js 0.8-
-
-
-    if (engineIsNode) {
-      defer = function defer(id) {
-        process$1.nextTick(runner(id));
-      }; // Sphere (JS game engine) Dispatch API
-
-    } else if (Dispatch && Dispatch.now) {
-      defer = function defer(id) {
-        Dispatch.now(runner(id));
-      }; // Browsers with MessageChannel, includes WebWorkers
-      // except iOS - https://github.com/zloirock/core-js/issues/624
-
-    } else if (MessageChannel && !engineIsIos) {
-      channel = new MessageChannel();
-      port = channel.port2;
-      channel.port1.onmessage = listener;
-      defer = functionBindContext(port.postMessage, port, 1); // Browsers with postMessage, skip WebWorkers
-      // IE8 has postMessage, but it's sync & typeof its postMessage is 'object'
-    } else if (global$1.addEventListener && typeof postMessage == 'function' && !global$1.importScripts && location && location.protocol !== 'file:' && !fails(post)) {
-      defer = post;
-      global$1.addEventListener('message', listener, false); // IE8-
-    } else if (ONREADYSTATECHANGE in documentCreateElement('script')) {
-      defer = function defer(id) {
-        html.appendChild(documentCreateElement('script'))[ONREADYSTATECHANGE] = function () {
-          html.removeChild(this);
-          run(id);
-        };
-      }; // Rest old browsers
-
-    } else {
-      defer = function defer(id) {
-        setTimeout(runner(id), 0);
-      };
-    }
-  }
-
-  var task = {
-    set: set$1,
-    clear: clear
-  };
-
-  var engineIsWebosWebkit = /web0s(?!.*chrome)/i.test(engineUserAgent);
-
-  var getOwnPropertyDescriptor$3 = objectGetOwnPropertyDescriptor.f;
-  var macrotask = task.set;
-  var MutationObserver = global$1.MutationObserver || global$1.WebKitMutationObserver;
-  var document$2 = global$1.document;
-  var process$2 = global$1.process;
-  var Promise$1 = global$1.Promise; // Node.js 11 shows ExperimentalWarning on getting `queueMicrotask`
-
-  var queueMicrotaskDescriptor = getOwnPropertyDescriptor$3(global$1, 'queueMicrotask');
-  var queueMicrotask = queueMicrotaskDescriptor && queueMicrotaskDescriptor.value;
-  var flush, head, last, notify, toggle, node, promise, then; // modern engines have queueMicrotask method
-
-  if (!queueMicrotask) {
-    flush = function flush() {
-      var parent, fn;
-      if (engineIsNode && (parent = process$2.domain)) parent.exit();
-
-      while (head) {
-        fn = head.fn;
-        head = head.next;
-
-        try {
-          fn();
-        } catch (error) {
-          if (head) notify();else last = undefined;
-          throw error;
-        }
-      }
-
-      last = undefined;
-      if (parent) parent.enter();
-    }; // browsers with MutationObserver, except iOS - https://github.com/zloirock/core-js/issues/339
-    // also except WebOS Webkit https://github.com/zloirock/core-js/issues/898
-
-
-    if (!engineIsIos && !engineIsNode && !engineIsWebosWebkit && MutationObserver && document$2) {
-      toggle = true;
-      node = document$2.createTextNode('');
-      new MutationObserver(flush).observe(node, {
-        characterData: true
-      });
-
-      notify = function notify() {
-        node.data = toggle = !toggle;
-      }; // environments with maybe non-completely correct, but existent Promise
-
-    } else if (Promise$1 && Promise$1.resolve) {
-      // Promise.resolve without an argument throws an error in LG WebOS 2
-      promise = Promise$1.resolve(undefined);
-      then = promise.then;
-
-      notify = function notify() {
-        then.call(promise, flush);
-      }; // Node.js without promises
-
-    } else if (engineIsNode) {
-      notify = function notify() {
-        process$2.nextTick(flush);
-      }; // for other environments - macrotask based on:
-      // - setImmediate
-      // - MessageChannel
-      // - window.postMessag
-      // - onreadystatechange
-      // - setTimeout
-
-    } else {
-      notify = function notify() {
-        // strange IE + webpack dev server bug - use .call(global)
-        macrotask.call(global$1, flush);
-      };
-    }
-  }
-
-  var microtask = queueMicrotask || function (fn) {
-    var task = {
-      fn: fn,
-      next: undefined
-    };
-    if (last) last.next = task;
-
-    if (!head) {
-      head = task;
-      notify();
-    }
-
-    last = task;
-  };
-
-  var PromiseCapability = function PromiseCapability(C) {
-    var resolve, reject;
-    this.promise = new C(function ($$resolve, $$reject) {
-      if (resolve !== undefined || reject !== undefined) throw TypeError('Bad Promise constructor');
-      resolve = $$resolve;
-      reject = $$reject;
-    });
-    this.resolve = aFunction$1(resolve);
-    this.reject = aFunction$1(reject);
-  }; // 25.4.1.5 NewPromiseCapability(C)
-
-
-  var f$5 = function f(C) {
-    return new PromiseCapability(C);
-  };
-
-  var newPromiseCapability = {
-    f: f$5
-  };
-
-  var promiseResolve = function promiseResolve(C, x) {
-    anObject(C);
-    if (isObject(x) && x.constructor === C) return x;
-    var promiseCapability = newPromiseCapability.f(C);
-    var resolve = promiseCapability.resolve;
-    resolve(x);
-    return promiseCapability.promise;
-  };
-
-  var hostReportErrors = function hostReportErrors(a, b) {
-    var console = global$1.console;
-
-    if (console && console.error) {
-      arguments.length === 1 ? console.error(a) : console.error(a, b);
-    }
-  };
-
-  var perform = function perform(exec) {
-    try {
-      return {
-        error: false,
-        value: exec()
-      };
-    } catch (error) {
-      return {
-        error: true,
-        value: error
-      };
-    }
-  };
-
-  var task$1 = task.set;
-  var SPECIES$4 = wellKnownSymbol('species');
-  var PROMISE = 'Promise';
-  var getInternalState$1 = internalState.get;
-  var setInternalState$1 = internalState.set;
-  var getInternalPromiseState = internalState.getterFor(PROMISE);
-  var PromiseConstructor = nativePromiseConstructor;
-  var TypeError$1 = global$1.TypeError;
-  var document$3 = global$1.document;
-  var process$3 = global$1.process;
-  var $fetch = getBuiltIn('fetch');
-  var newPromiseCapability$1 = newPromiseCapability.f;
-  var newGenericPromiseCapability = newPromiseCapability$1;
-  var DISPATCH_EVENT = !!(document$3 && document$3.createEvent && global$1.dispatchEvent);
-  var NATIVE_REJECTION_EVENT = typeof PromiseRejectionEvent == 'function';
-  var UNHANDLED_REJECTION = 'unhandledrejection';
-  var REJECTION_HANDLED = 'rejectionhandled';
-  var PENDING = 0;
-  var FULFILLED = 1;
-  var REJECTED = 2;
-  var HANDLED = 1;
-  var UNHANDLED = 2;
-  var Internal, OwnPromiseCapability, PromiseWrapper, nativeThen;
-  var FORCED$1 = isForced_1(PROMISE, function () {
-    var GLOBAL_CORE_JS_PROMISE = inspectSource(PromiseConstructor) !== String(PromiseConstructor);
-
-    if (!GLOBAL_CORE_JS_PROMISE) {
-      // V8 6.6 (Node 10 and Chrome 66) have a bug with resolving custom thenables
-      // https://bugs.chromium.org/p/chromium/issues/detail?id=830565
-      // We can't detect it synchronously, so just check versions
-      if (engineV8Version === 66) return true; // Unhandled rejections tracking support, NodeJS Promise without it fails @@species test
-
-      if (!engineIsNode && !NATIVE_REJECTION_EVENT) return true;
-    } // We need Promise#finally in the pure version for preventing prototype pollution
-    // deoptimization and performance degradation
-    // https://github.com/zloirock/core-js/issues/679
-
-    if (engineV8Version >= 51 && /native code/.test(PromiseConstructor)) return false; // Detect correctness of subclassing with @@species support
-
-    var promise = PromiseConstructor.resolve(1);
-
-    var FakePromise = function FakePromise(exec) {
-      exec(function () {
-        /* empty */
-      }, function () {
-        /* empty */
-      });
-    };
-
-    var constructor = promise.constructor = {};
-    constructor[SPECIES$4] = FakePromise;
-    return !(promise.then(function () {
-      /* empty */
-    }) instanceof FakePromise);
-  });
-  var INCORRECT_ITERATION = FORCED$1 || !checkCorrectnessOfIteration(function (iterable) {
-    PromiseConstructor.all(iterable)['catch'](function () {
-      /* empty */
-    });
-  }); // helpers
-
-  var isThenable = function isThenable(it) {
-    var then;
-    return isObject(it) && typeof (then = it.then) == 'function' ? then : false;
-  };
-
-  var notify$1 = function notify(state, isReject) {
-    if (state.notified) return;
-    state.notified = true;
-    var chain = state.reactions;
-    microtask(function () {
-      var value = state.value;
-      var ok = state.state == FULFILLED;
-      var index = 0; // variable length - can't use forEach
-
-      while (chain.length > index) {
-        var reaction = chain[index++];
-        var handler = ok ? reaction.ok : reaction.fail;
-        var resolve = reaction.resolve;
-        var reject = reaction.reject;
-        var domain = reaction.domain;
-        var result, then, exited;
-
-        try {
-          if (handler) {
-            if (!ok) {
-              if (state.rejection === UNHANDLED) onHandleUnhandled(state);
-              state.rejection = HANDLED;
-            }
-
-            if (handler === true) result = value;else {
-              if (domain) domain.enter();
-              result = handler(value); // can throw
-
-              if (domain) {
-                domain.exit();
-                exited = true;
-              }
-            }
-
-            if (result === reaction.promise) {
-              reject(TypeError$1('Promise-chain cycle'));
-            } else if (then = isThenable(result)) {
-              then.call(result, resolve, reject);
-            } else resolve(result);
-          } else reject(value);
-        } catch (error) {
-          if (domain && !exited) domain.exit();
-          reject(error);
-        }
-      }
-
-      state.reactions = [];
-      state.notified = false;
-      if (isReject && !state.rejection) onUnhandled(state);
-    });
-  };
-
-  var dispatchEvent = function dispatchEvent(name, promise, reason) {
-    var event, handler;
-
-    if (DISPATCH_EVENT) {
-      event = document$3.createEvent('Event');
-      event.promise = promise;
-      event.reason = reason;
-      event.initEvent(name, false, true);
-      global$1.dispatchEvent(event);
-    } else event = {
-      promise: promise,
-      reason: reason
-    };
-
-    if (!NATIVE_REJECTION_EVENT && (handler = global$1['on' + name])) handler(event);else if (name === UNHANDLED_REJECTION) hostReportErrors('Unhandled promise rejection', reason);
-  };
-
-  var onUnhandled = function onUnhandled(state) {
-    task$1.call(global$1, function () {
-      var promise = state.facade;
-      var value = state.value;
-      var IS_UNHANDLED = isUnhandled(state);
-      var result;
-
-      if (IS_UNHANDLED) {
-        result = perform(function () {
-          if (engineIsNode) {
-            process$3.emit('unhandledRejection', value, promise);
-          } else dispatchEvent(UNHANDLED_REJECTION, promise, value);
-        }); // Browsers should not trigger `rejectionHandled` event if it was handled here, NodeJS - should
-
-        state.rejection = engineIsNode || isUnhandled(state) ? UNHANDLED : HANDLED;
-        if (result.error) throw result.value;
-      }
-    });
-  };
-
-  var isUnhandled = function isUnhandled(state) {
-    return state.rejection !== HANDLED && !state.parent;
-  };
-
-  var onHandleUnhandled = function onHandleUnhandled(state) {
-    task$1.call(global$1, function () {
-      var promise = state.facade;
-
-      if (engineIsNode) {
-        process$3.emit('rejectionHandled', promise);
-      } else dispatchEvent(REJECTION_HANDLED, promise, state.value);
-    });
-  };
-
-  var bind = function bind(fn, state, unwrap) {
-    return function (value) {
-      fn(state, value, unwrap);
-    };
-  };
-
-  var internalReject = function internalReject(state, value, unwrap) {
-    if (state.done) return;
-    state.done = true;
-    if (unwrap) state = unwrap;
-    state.value = value;
-    state.state = REJECTED;
-    notify$1(state, true);
-  };
-
-  var internalResolve = function internalResolve(state, value, unwrap) {
-    if (state.done) return;
-    state.done = true;
-    if (unwrap) state = unwrap;
-
-    try {
-      if (state.facade === value) throw TypeError$1("Promise can't be resolved itself");
-      var then = isThenable(value);
-
-      if (then) {
-        microtask(function () {
-          var wrapper = {
-            done: false
-          };
-
-          try {
-            then.call(value, bind(internalResolve, wrapper, state), bind(internalReject, wrapper, state));
-          } catch (error) {
-            internalReject(wrapper, error, state);
-          }
-        });
-      } else {
-        state.value = value;
-        state.state = FULFILLED;
-        notify$1(state, false);
-      }
-    } catch (error) {
-      internalReject({
-        done: false
-      }, error, state);
-    }
-  }; // constructor polyfill
-
-
-  if (FORCED$1) {
-    // 25.4.3.1 Promise(executor)
-    PromiseConstructor = function Promise(executor) {
-      anInstance(this, PromiseConstructor, PROMISE);
-      aFunction$1(executor);
-      Internal.call(this);
-      var state = getInternalState$1(this);
-
-      try {
-        executor(bind(internalResolve, state), bind(internalReject, state));
-      } catch (error) {
-        internalReject(state, error);
-      }
-    }; // eslint-disable-next-line no-unused-vars
-
-
-    Internal = function Promise(executor) {
-      setInternalState$1(this, {
-        type: PROMISE,
-        done: false,
-        notified: false,
-        parent: false,
-        reactions: [],
-        rejection: false,
-        state: PENDING,
-        value: undefined
-      });
-    };
-
-    Internal.prototype = redefineAll(PromiseConstructor.prototype, {
-      // `Promise.prototype.then` method
-      // https://tc39.es/ecma262/#sec-promise.prototype.then
-      then: function then(onFulfilled, onRejected) {
-        var state = getInternalPromiseState(this);
-        var reaction = newPromiseCapability$1(speciesConstructor(this, PromiseConstructor));
-        reaction.ok = typeof onFulfilled == 'function' ? onFulfilled : true;
-        reaction.fail = typeof onRejected == 'function' && onRejected;
-        reaction.domain = engineIsNode ? process$3.domain : undefined;
-        state.parent = true;
-        state.reactions.push(reaction);
-        if (state.state != PENDING) notify$1(state, false);
-        return reaction.promise;
-      },
-      // `Promise.prototype.catch` method
-      // https://tc39.es/ecma262/#sec-promise.prototype.catch
-      'catch': function _catch(onRejected) {
-        return this.then(undefined, onRejected);
-      }
-    });
-
-    OwnPromiseCapability = function OwnPromiseCapability() {
-      var promise = new Internal();
-      var state = getInternalState$1(promise);
-      this.promise = promise;
-      this.resolve = bind(internalResolve, state);
-      this.reject = bind(internalReject, state);
-    };
-
-    newPromiseCapability.f = newPromiseCapability$1 = function newPromiseCapability(C) {
-      return C === PromiseConstructor || C === PromiseWrapper ? new OwnPromiseCapability(C) : newGenericPromiseCapability(C);
-    };
-
-    if ( typeof nativePromiseConstructor == 'function') {
-      nativeThen = nativePromiseConstructor.prototype.then; // wrap native Promise#then for native async functions
-
-      redefine(nativePromiseConstructor.prototype, 'then', function then(onFulfilled, onRejected) {
-        var that = this;
-        return new PromiseConstructor(function (resolve, reject) {
-          nativeThen.call(that, resolve, reject);
-        }).then(onFulfilled, onRejected); // https://github.com/zloirock/core-js/issues/640
-      }, {
-        unsafe: true
-      }); // wrap fetch result
-
-      if (typeof $fetch == 'function') _export({
-        global: true,
-        enumerable: true,
-        forced: true
-      }, {
-        // eslint-disable-next-line no-unused-vars
-        fetch: function fetch(input
-        /* , init */
-        ) {
-          return promiseResolve(PromiseConstructor, $fetch.apply(global$1, arguments));
-        }
-      });
-    }
-  }
-
-  _export({
-    global: true,
-    wrap: true,
-    forced: FORCED$1
-  }, {
-    Promise: PromiseConstructor
-  });
-  setToStringTag(PromiseConstructor, PROMISE, false);
-  setSpecies(PROMISE);
-  PromiseWrapper = getBuiltIn(PROMISE); // statics
-
-  _export({
-    target: PROMISE,
-    stat: true,
-    forced: FORCED$1
-  }, {
-    // `Promise.reject` method
-    // https://tc39.es/ecma262/#sec-promise.reject
-    reject: function reject(r) {
-      var capability = newPromiseCapability$1(this);
-      capability.reject.call(undefined, r);
-      return capability.promise;
-    }
-  });
-  _export({
-    target: PROMISE,
-    stat: true,
-    forced:  FORCED$1
-  }, {
-    // `Promise.resolve` method
-    // https://tc39.es/ecma262/#sec-promise.resolve
-    resolve: function resolve(x) {
-      return promiseResolve( this, x);
-    }
-  });
-  _export({
-    target: PROMISE,
-    stat: true,
-    forced: INCORRECT_ITERATION
-  }, {
-    // `Promise.all` method
-    // https://tc39.es/ecma262/#sec-promise.all
-    all: function all(iterable) {
-      var C = this;
-      var capability = newPromiseCapability$1(C);
-      var resolve = capability.resolve;
-      var reject = capability.reject;
-      var result = perform(function () {
-        var $promiseResolve = aFunction$1(C.resolve);
-        var values = [];
-        var counter = 0;
-        var remaining = 1;
-        iterate(iterable, function (promise) {
-          var index = counter++;
-          var alreadyCalled = false;
-          values.push(undefined);
-          remaining++;
-          $promiseResolve.call(C, promise).then(function (value) {
-            if (alreadyCalled) return;
-            alreadyCalled = true;
-            values[index] = value;
-            --remaining || resolve(values);
-          }, reject);
-        });
-        --remaining || resolve(values);
-      });
-      if (result.error) reject(result.value);
-      return capability.promise;
-    },
-    // `Promise.race` method
-    // https://tc39.es/ecma262/#sec-promise.race
-    race: function race(iterable) {
-      var C = this;
-      var capability = newPromiseCapability$1(C);
-      var reject = capability.reject;
-      var result = perform(function () {
-        var $promiseResolve = aFunction$1(C.resolve);
-        iterate(iterable, function (promise) {
-          $promiseResolve.call(C, promise).then(capability.resolve, reject);
-        });
-      });
-      if (result.error) reject(result.value);
-      return capability.promise;
-    }
-  });
-
-  // https://tc39.es/ecma262/#sec-get-regexp.prototype.flags
-
-
-  var regexpFlags = function regexpFlags() {
-    var that = anObject(this);
-    var result = '';
-    if (that.global) result += 'g';
-    if (that.ignoreCase) result += 'i';
-    if (that.multiline) result += 'm';
-    if (that.dotAll) result += 's';
-    if (that.unicode) result += 'u';
-    if (that.sticky) result += 'y';
-    return result;
-  };
-
-  // so we use an intermediate function.
-
-
-  function RE(s, f) {
-    return RegExp(s, f);
-  }
-
-  var UNSUPPORTED_Y = fails(function () {
-    // babel-minify transpiles RegExp('a', 'y') -> /a/y and it causes SyntaxError
-    var re = RE('a', 'y');
-    re.lastIndex = 2;
-    return re.exec('abcd') != null;
-  });
-  var BROKEN_CARET = fails(function () {
-    // https://bugzilla.mozilla.org/show_bug.cgi?id=773687
-    var re = RE('^r', 'gy');
-    re.lastIndex = 2;
-    return re.exec('str') != null;
-  });
-  var regexpStickyHelpers = {
-    UNSUPPORTED_Y: UNSUPPORTED_Y,
-    BROKEN_CARET: BROKEN_CARET
-  };
-
-  var nativeExec = RegExp.prototype.exec; // This always refers to the native implementation, because the
-  // String#replace polyfill uses ./fix-regexp-well-known-symbol-logic.js,
-  // which loads this file before patching the method.
-
-  var nativeReplace = String.prototype.replace;
-  var patchedExec = nativeExec;
-
-  var UPDATES_LAST_INDEX_WRONG = function () {
-    var re1 = /a/;
-    var re2 = /b*/g;
-    nativeExec.call(re1, 'a');
-    nativeExec.call(re2, 'a');
-    return re1.lastIndex !== 0 || re2.lastIndex !== 0;
-  }();
-
-  var UNSUPPORTED_Y$1 = regexpStickyHelpers.UNSUPPORTED_Y || regexpStickyHelpers.BROKEN_CARET; // nonparticipating capturing group, copied from es5-shim's String#split patch.
-
-  var NPCG_INCLUDED = /()??/.exec('')[1] !== undefined;
-  var PATCH = UPDATES_LAST_INDEX_WRONG || NPCG_INCLUDED || UNSUPPORTED_Y$1;
-
-  if (PATCH) {
-    patchedExec = function exec(str) {
-      var re = this;
-      var lastIndex, reCopy, match, i;
-      var sticky = UNSUPPORTED_Y$1 && re.sticky;
-      var flags = regexpFlags.call(re);
-      var source = re.source;
-      var charsAdded = 0;
-      var strCopy = str;
-
-      if (sticky) {
-        flags = flags.replace('y', '');
-
-        if (flags.indexOf('g') === -1) {
-          flags += 'g';
-        }
-
-        strCopy = String(str).slice(re.lastIndex); // Support anchored sticky behavior.
-
-        if (re.lastIndex > 0 && (!re.multiline || re.multiline && str[re.lastIndex - 1] !== '\n')) {
-          source = '(?: ' + source + ')';
-          strCopy = ' ' + strCopy;
-          charsAdded++;
-        } // ^(? + rx + ) is needed, in combination with some str slicing, to
-        // simulate the 'y' flag.
-
-
-        reCopy = new RegExp('^(?:' + source + ')', flags);
-      }
-
-      if (NPCG_INCLUDED) {
-        reCopy = new RegExp('^' + source + '$(?!\\s)', flags);
-      }
-
-      if (UPDATES_LAST_INDEX_WRONG) lastIndex = re.lastIndex;
-      match = nativeExec.call(sticky ? reCopy : re, strCopy);
-
-      if (sticky) {
-        if (match) {
-          match.input = match.input.slice(charsAdded);
-          match[0] = match[0].slice(charsAdded);
-          match.index = re.lastIndex;
-          re.lastIndex += match[0].length;
-        } else re.lastIndex = 0;
-      } else if (UPDATES_LAST_INDEX_WRONG && match) {
-        re.lastIndex = re.global ? match.index + match[0].length : lastIndex;
-      }
-
-      if (NPCG_INCLUDED && match && match.length > 1) {
-        // Fix browsers whose `exec` methods don't consistently return `undefined`
-        // for NPCG, like IE8. NOTE: This doesn' work for /(.?)?/
-        nativeReplace.call(match[0], reCopy, function () {
-          for (i = 1; i < arguments.length - 2; i++) {
-            if (arguments[i] === undefined) match[i] = undefined;
-          }
-        });
-      }
-
-      return match;
-    };
-  }
-
-  var regexpExec = patchedExec;
-
-  // https://tc39.es/ecma262/#sec-regexp.prototype.exec
-
-
-  _export({
-    target: 'RegExp',
-    proto: true,
-    forced: /./.exec !== regexpExec
-  }, {
-    exec: regexpExec
-  });
-
-  var createMethod$3 = function createMethod(CONVERT_TO_STRING) {
-    return function ($this, pos) {
-      var S = String(requireObjectCoercible($this));
-      var position = toInteger(pos);
-      var size = S.length;
-      var first, second;
-      if (position < 0 || position >= size) return CONVERT_TO_STRING ? '' : undefined;
-      first = S.charCodeAt(position);
-      return first < 0xD800 || first > 0xDBFF || position + 1 === size || (second = S.charCodeAt(position + 1)) < 0xDC00 || second > 0xDFFF ? CONVERT_TO_STRING ? S.charAt(position) : first : CONVERT_TO_STRING ? S.slice(position, position + 2) : (first - 0xD800 << 10) + (second - 0xDC00) + 0x10000;
-    };
-  };
-
-  var stringMultibyte = {
-    // `String.prototype.codePointAt` method
-    // https://tc39.es/ecma262/#sec-string.prototype.codepointat
-    codeAt: createMethod$3(false),
-    // `String.prototype.at` method
-    // https://github.com/mathiasbynens/String.prototype.at
-    charAt: createMethod$3(true)
-  };
-
-  var charAt = stringMultibyte.charAt;
-  var STRING_ITERATOR = 'String Iterator';
-  var setInternalState$2 = internalState.set;
-  var getInternalState$2 = internalState.getterFor(STRING_ITERATOR); // `String.prototype[@@iterator]` method
-  // https://tc39.es/ecma262/#sec-string.prototype-@@iterator
-
-  defineIterator(String, 'String', function (iterated) {
-    setInternalState$2(this, {
-      type: STRING_ITERATOR,
-      string: String(iterated),
-      index: 0
-    }); // `%StringIteratorPrototype%.next` method
-    // https://tc39.es/ecma262/#sec-%stringiteratorprototype%.next
-  }, function next() {
-    var state = getInternalState$2(this);
-    var string = state.string;
-    var index = state.index;
-    var point;
-    if (index >= string.length) return {
-      value: undefined,
-      done: true
-    };
-    point = charAt(string, index);
-    state.index += point.length;
-    return {
-      value: point,
-      done: false
-    };
-  });
-
-  var SPECIES$5 = wellKnownSymbol('species');
-  var REPLACE_SUPPORTS_NAMED_GROUPS = !fails(function () {
-    // #replace needs built-in support for named groups.
-    // #match works fine because it just return the exec results, even if it has
-    // a "grops" property.
-    var re = /./;
-
-    re.exec = function () {
-      var result = [];
-      result.groups = {
-        a: '7'
-      };
-      return result;
-    };
-
-    return ''.replace(re, '$<a>') !== '7';
-  }); // IE <= 11 replaces $0 with the whole match, as if it was $&
-  // https://stackoverflow.com/questions/6024666/getting-ie-to-replace-a-regex-with-the-literal-string-0
-
-  var REPLACE_KEEPS_$0 = function () {
-    return 'a'.replace(/./, '$0') === '$0';
-  }();
-
-  var REPLACE = wellKnownSymbol('replace'); // Safari <= 13.0.3(?) substitutes nth capture where n>m with an empty string
-
-  var REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE = function () {
-    if (/./[REPLACE]) {
-      return /./[REPLACE]('a', '$0') === '';
-    }
-
-    return false;
-  }(); // Chrome 51 has a buggy "split" implementation when RegExp#exec !== nativeExec
-  // Weex JS has frozen built-in prototypes, so use try / catch wrapper
-
-
-  var SPLIT_WORKS_WITH_OVERWRITTEN_EXEC = !fails(function () {
-    var re = /(?:)/;
-    var originalExec = re.exec;
-
-    re.exec = function () {
-      return originalExec.apply(this, arguments);
-    };
-
-    var result = 'ab'.split(re);
-    return result.length !== 2 || result[0] !== 'a' || result[1] !== 'b';
-  });
-
-  var fixRegexpWellKnownSymbolLogic = function fixRegexpWellKnownSymbolLogic(KEY, length, exec, sham) {
-    var SYMBOL = wellKnownSymbol(KEY);
-    var DELEGATES_TO_SYMBOL = !fails(function () {
-      // String methods call symbol-named RegEp methods
-      var O = {};
-
-      O[SYMBOL] = function () {
-        return 7;
-      };
-
-      return ''[KEY](O) != 7;
-    });
-    var DELEGATES_TO_EXEC = DELEGATES_TO_SYMBOL && !fails(function () {
-      // Symbol-named RegExp methods call .exec
-      var execCalled = false;
-      var re = /a/;
-
-      if (KEY === 'split') {
-        // We can't use real regex here since it causes deoptimization
-        // and serious performance degradation in V8
-        // https://github.com/zloirock/core-js/issues/306
-        re = {}; // RegExp[@@split] doesn't call the regex's exec method, but first creates
-        // a new one. We need to return the patched regex when creating the new one.
-
-        re.constructor = {};
-
-        re.constructor[SPECIES$5] = function () {
-          return re;
-        };
-
-        re.flags = '';
-        re[SYMBOL] = /./[SYMBOL];
-      }
-
-      re.exec = function () {
-        execCalled = true;
-        return null;
-      };
-
-      re[SYMBOL]('');
-      return !execCalled;
-    });
-
-    if (!DELEGATES_TO_SYMBOL || !DELEGATES_TO_EXEC || KEY === 'replace' && !(REPLACE_SUPPORTS_NAMED_GROUPS && REPLACE_KEEPS_$0 && !REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE) || KEY === 'split' && !SPLIT_WORKS_WITH_OVERWRITTEN_EXEC) {
-      var nativeRegExpMethod = /./[SYMBOL];
-      var methods = exec(SYMBOL, ''[KEY], function (nativeMethod, regexp, str, arg2, forceStringMethod) {
-        if (regexp.exec === regexpExec) {
-          if (DELEGATES_TO_SYMBOL && !forceStringMethod) {
-            // The native String method already delegates to @@method (this
-            // polyfilled function), leasing to infinite recursion.
-            // We avoid it by directly calling the native @@method method.
-            return {
-              done: true,
-              value: nativeRegExpMethod.call(regexp, str, arg2)
-            };
-          }
-
-          return {
-            done: true,
-            value: nativeMethod.call(str, regexp, arg2)
-          };
-        }
-
-        return {
-          done: false
-        };
-      }, {
-        REPLACE_KEEPS_$0: REPLACE_KEEPS_$0,
-        REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE: REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE
-      });
-      var stringMethod = methods[0];
-      var regexMethod = methods[1];
-      redefine(String.prototype, KEY, stringMethod);
-      redefine(RegExp.prototype, SYMBOL, length == 2 // 21.2.5.8 RegExp.prototype[@@replace](string, replaceValue)
-      // 21.2.5.11 RegExp.prototype[@@split](string, limit)
-      ? function (string, arg) {
-        return regexMethod.call(string, this, arg);
-      } // 21.2.5.6 RegExp.prototype[@@match](string)
-      // 21.2.5.9 RegExp.prototype[@@search](string)
-      : function (string) {
-        return regexMethod.call(string, this);
-      });
-    }
-
-    if (sham) createNonEnumerableProperty(RegExp.prototype[SYMBOL], 'sham', true);
-  };
-
-  var charAt$1 = stringMultibyte.charAt; // `AdvanceStringIndex` abstract operation
-  // https://tc39.es/ecma262/#sec-advancestringindex
-
-  var advanceStringIndex = function advanceStringIndex(S, index, unicode) {
-    return index + (unicode ? charAt$1(S, index).length : 1);
-  };
-
-  var floor$1 = Math.floor;
-  var replace = ''.replace;
-  var SUBSTITUTION_SYMBOLS = /\$([$&'`]|\d\d?|<[^>]*>)/g;
-  var SUBSTITUTION_SYMBOLS_NO_NAMED = /\$([$&'`]|\d\d?)/g; // https://tc39.es/ecma262/#sec-getsubstitution
-
-  var getSubstitution = function getSubstitution(matched, str, position, captures, namedCaptures, replacement) {
-    var tailPos = position + matched.length;
-    var m = captures.length;
-    var symbols = SUBSTITUTION_SYMBOLS_NO_NAMED;
-
-    if (namedCaptures !== undefined) {
-      namedCaptures = toObject(namedCaptures);
-      symbols = SUBSTITUTION_SYMBOLS;
-    }
-
-    return replace.call(replacement, symbols, function (match, ch) {
-      var capture;
-
-      switch (ch.charAt(0)) {
-        case '$':
-          return '$';
-
-        case '&':
-          return matched;
-
-        case '`':
-          return str.slice(0, position);
-
-        case "'":
-          return str.slice(tailPos);
-
-        case '<':
-          capture = namedCaptures[ch.slice(1, -1)];
-          break;
-
-        default:
-          // \d\d?
-          var n = +ch;
-          if (n === 0) return match;
-
-          if (n > m) {
-            var f = floor$1(n / 10);
-            if (f === 0) return match;
-            if (f <= m) return captures[f - 1] === undefined ? ch.charAt(1) : captures[f - 1] + ch.charAt(1);
-            return match;
-          }
-
-          capture = captures[n - 1];
-      }
-
-      return capture === undefined ? '' : capture;
-    });
-  };
-
-  // https://tc39.es/ecma262/#sec-regexpexec
-
-  var regexpExecAbstract = function regexpExecAbstract(R, S) {
-    var exec = R.exec;
-
-    if (typeof exec === 'function') {
-      var result = exec.call(R, S);
-
-      if (_typeof(result) !== 'object') {
-        throw TypeError('RegExp exec method returned something other than an Object or null');
-      }
-
-      return result;
-    }
-
-    if (classofRaw(R) !== 'RegExp') {
-      throw TypeError('RegExp#exec called on incompatible receiver');
-    }
-
-    return regexpExec.call(R, S);
-  };
-
-  var max$2 = Math.max;
-  var min$3 = Math.min;
-
-  var maybeToString = function maybeToString(it) {
-    return it === undefined ? it : String(it);
-  }; // @@replace logic
-
-
-  fixRegexpWellKnownSymbolLogic('replace', 2, function (REPLACE, nativeReplace, maybeCallNative, reason) {
-    var REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE = reason.REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE;
-    var REPLACE_KEEPS_$0 = reason.REPLACE_KEEPS_$0;
-    var UNSAFE_SUBSTITUTE = REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE ? '$' : '$0';
-    return [// `String.prototype.replace` method
-    // https://tc39.es/ecma262/#sec-string.prototype.replace
-    function replace(searchValue, replaceValue) {
-      var O = requireObjectCoercible(this);
-      var replacer = searchValue == undefined ? undefined : searchValue[REPLACE];
-      return replacer !== undefined ? replacer.call(searchValue, O, replaceValue) : nativeReplace.call(String(O), searchValue, replaceValue);
-    }, // `RegExp.prototype[@@replace]` method
-    // https://tc39.es/ecma262/#sec-regexp.prototype-@@replace
-    function (regexp, replaceValue) {
-      if (!REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE && REPLACE_KEEPS_$0 || typeof replaceValue === 'string' && replaceValue.indexOf(UNSAFE_SUBSTITUTE) === -1) {
-        var res = maybeCallNative(nativeReplace, regexp, this, replaceValue);
-        if (res.done) return res.value;
-      }
-
-      var rx = anObject(regexp);
-      var S = String(this);
-      var functionalReplace = typeof replaceValue === 'function';
-      if (!functionalReplace) replaceValue = String(replaceValue);
-      var global = rx.global;
-
-      if (global) {
-        var fullUnicode = rx.unicode;
-        rx.lastIndex = 0;
-      }
-
-      var results = [];
-
-      while (true) {
-        var result = regexpExecAbstract(rx, S);
-        if (result === null) break;
-        results.push(result);
-        if (!global) break;
-        var matchStr = String(result[0]);
-        if (matchStr === '') rx.lastIndex = advanceStringIndex(S, toLength(rx.lastIndex), fullUnicode);
-      }
-
-      var accumulatedResult = '';
-      var nextSourcePosition = 0;
-
-      for (var i = 0; i < results.length; i++) {
-        result = results[i];
-        var matched = String(result[0]);
-        var position = max$2(min$3(toInteger(result.index), S.length), 0);
-        var captures = []; // NOTE: This is equivalent to
-        //   captures = result.slice(1).map(maybeToString)
-        // but for some reason `nativeSlice.call(result, 1, result.length)` (called in
-        // the slice polyfill when slicing native arrays) "doesn't work" in safari 9 and
-        // causes a crash (https://pastebin.com/N21QzeQA) when trying to debug it.
-
-        for (var j = 1; j < result.length; j++) {
-          captures.push(maybeToString(result[j]));
-        }
-
-        var namedCaptures = result.groups;
-
-        if (functionalReplace) {
-          var replacerArgs = [matched].concat(captures, position, S);
-          if (namedCaptures !== undefined) replacerArgs.push(namedCaptures);
-          var replacement = String(replaceValue.apply(undefined, replacerArgs));
-        } else {
-          replacement = getSubstitution(matched, S, position, captures, namedCaptures, replaceValue);
-        }
-
-        if (position >= nextSourcePosition) {
-          accumulatedResult += S.slice(nextSourcePosition, position) + replacement;
-          nextSourcePosition = position + matched.length;
-        }
-      }
-
-      return accumulatedResult + S.slice(nextSourcePosition);
-    }];
-  });
-
-  // iterable DOM collections
-  // flag - `iterable` interface - 'entries', 'keys', 'values', 'forEach' methods
-  var domIterables = {
-    CSSRuleList: 0,
-    CSSStyleDeclaration: 0,
-    CSSValueList: 0,
-    ClientRectList: 0,
-    DOMRectList: 0,
-    DOMStringList: 0,
-    DOMTokenList: 1,
-    DataTransferItemList: 0,
-    FileList: 0,
-    HTMLAllCollection: 0,
-    HTMLCollection: 0,
-    HTMLFormElement: 0,
-    HTMLSelectElement: 0,
-    MediaList: 0,
-    MimeTypeArray: 0,
-    NamedNodeMap: 0,
-    NodeList: 1,
-    PaintRequestList: 0,
-    Plugin: 0,
-    PluginArray: 0,
-    SVGLengthList: 0,
-    SVGNumberList: 0,
-    SVGPathSegList: 0,
-    SVGPointList: 0,
-    SVGStringList: 0,
-    SVGTransformList: 0,
-    SourceBufferList: 0,
-    StyleSheetList: 0,
-    TextTrackCueList: 0,
-    TextTrackList: 0,
-    TouchList: 0
-  };
-
-  var ITERATOR$5 = wellKnownSymbol('iterator');
-  var TO_STRING_TAG$3 = wellKnownSymbol('toStringTag');
-  var ArrayValues = es_array_iterator.values;
-
-  for (var COLLECTION_NAME in domIterables) {
-    var Collection = global$1[COLLECTION_NAME];
-    var CollectionPrototype = Collection && Collection.prototype;
-
-    if (CollectionPrototype) {
-      // some Chrome versions have non-configurable methods on DOMTokenList
-      if (CollectionPrototype[ITERATOR$5] !== ArrayValues) try {
-        createNonEnumerableProperty(CollectionPrototype, ITERATOR$5, ArrayValues);
-      } catch (error) {
-        CollectionPrototype[ITERATOR$5] = ArrayValues;
-      }
-
-      if (!CollectionPrototype[TO_STRING_TAG$3]) {
-        createNonEnumerableProperty(CollectionPrototype, TO_STRING_TAG$3, COLLECTION_NAME);
-      }
-
-      if (domIterables[COLLECTION_NAME]) for (var METHOD_NAME in es_array_iterator) {
-        // some Chrome versions have non-configurable methods on DOMTokenList
-        if (CollectionPrototype[METHOD_NAME] !== es_array_iterator[METHOD_NAME]) try {
-          createNonEnumerableProperty(CollectionPrototype, METHOD_NAME, es_array_iterator[METHOD_NAME]);
-        } catch (error) {
-          CollectionPrototype[METHOD_NAME] = es_array_iterator[METHOD_NAME];
-        }
-      }
-    }
-  }
-
-  var runtime_1 = createCommonjsModule(function (module) {
-    var runtime = function (exports) {
-
-      var Op = Object.prototype;
-      var hasOwn = Op.hasOwnProperty;
-      var undefined$1; // More compressible than void 0.
-
-      var $Symbol = typeof Symbol === "function" ? Symbol : {};
-      var iteratorSymbol = $Symbol.iterator || "@@iterator";
-      var asyncIteratorSymbol = $Symbol.asyncIterator || "@@asyncIterator";
-      var toStringTagSymbol = $Symbol.toStringTag || "@@toStringTag";
-
-      function define(obj, key, value) {
-        Object.defineProperty(obj, key, {
-          value: value,
-          enumerable: true,
-          configurable: true,
-          writable: true
-        });
-        return obj[key];
-      }
-
-      try {
-        // IE 8 has a broken Object.defineProperty that only works on DOM objects.
-        define({}, "");
-      } catch (err) {
-        define = function define(obj, key, value) {
-          return obj[key] = value;
-        };
-      }
-
-      function wrap(innerFn, outerFn, self, tryLocsList) {
-        // If outerFn provided and outerFn.prototype is a Generator, then outerFn.prototype instanceof Generator.
-        var protoGenerator = outerFn && outerFn.prototype instanceof Generator ? outerFn : Generator;
-        var generator = Object.create(protoGenerator.prototype);
-        var context = new Context(tryLocsList || []); // The ._invoke method unifies the implementations of the .next,
-        // .throw, and .return methods.
-
-        generator._invoke = makeInvokeMethod(innerFn, self, context);
-        return generator;
-      }
-
-      exports.wrap = wrap; // Try/catch helper to minimize deoptimizations. Returns a completion
-      // record like context.tryEntries[i].completion. This interface could
-      // have been (and was previously) designed to take a closure to be
-      // invoked without arguments, but in all the cases we care about we
-      // already have an existing method we want to call, so there's no need
-      // to create a new function object. We can even get away with assuming
-      // the method takes exactly one argument, since that happens to be true
-      // in every case, so we don't have to touch the arguments object. The
-      // only additional allocation required is the completion record, which
-      // has a stable shape and so hopefully should be cheap to allocate.
-
-      function tryCatch(fn, obj, arg) {
-        try {
-          return {
-            type: "normal",
-            arg: fn.call(obj, arg)
-          };
-        } catch (err) {
-          return {
-            type: "throw",
-            arg: err
-          };
-        }
-      }
-
-      var GenStateSuspendedStart = "suspendedStart";
-      var GenStateSuspendedYield = "suspendedYield";
-      var GenStateExecuting = "executing";
-      var GenStateCompleted = "completed"; // Returning this object from the innerFn has the same effect as
-      // breaking out of the dispatch switch statement.
-
-      var ContinueSentinel = {}; // Dummy constructor functions that we use as the .constructor and
-      // .constructor.prototype properties for functions that return Generator
-      // objects. For full spec compliance, you may wish to configure your
-      // minifier not to mangle the names of these two functions.
-
-      function Generator() {}
-
-      function GeneratorFunction() {}
-
-      function GeneratorFunctionPrototype() {} // This is a polyfill for %IteratorPrototype% for environments that
-      // don't natively support it.
-
-
-      var IteratorPrototype = {};
-
-      IteratorPrototype[iteratorSymbol] = function () {
-        return this;
-      };
-
-      var getProto = Object.getPrototypeOf;
-      var NativeIteratorPrototype = getProto && getProto(getProto(values([])));
-
-      if (NativeIteratorPrototype && NativeIteratorPrototype !== Op && hasOwn.call(NativeIteratorPrototype, iteratorSymbol)) {
-        // This environment has a native %IteratorPrototype%; use it instead
-        // of the polyfill.
-        IteratorPrototype = NativeIteratorPrototype;
-      }
-
-      var Gp = GeneratorFunctionPrototype.prototype = Generator.prototype = Object.create(IteratorPrototype);
-      GeneratorFunction.prototype = Gp.constructor = GeneratorFunctionPrototype;
-      GeneratorFunctionPrototype.constructor = GeneratorFunction;
-      GeneratorFunction.displayName = define(GeneratorFunctionPrototype, toStringTagSymbol, "GeneratorFunction"); // Helper for defining the .next, .throw, and .return methods of the
-      // Iterator interface in terms of a single ._invoke method.
-
-      function defineIteratorMethods(prototype) {
-        ["next", "throw", "return"].forEach(function (method) {
-          define(prototype, method, function (arg) {
-            return this._invoke(method, arg);
-          });
-        });
-      }
-
-      exports.isGeneratorFunction = function (genFun) {
-        var ctor = typeof genFun === "function" && genFun.constructor;
-        return ctor ? ctor === GeneratorFunction || // For the native GeneratorFunction constructor, the best we can
-        // do is to check its .name property.
-        (ctor.displayName || ctor.name) === "GeneratorFunction" : false;
-      };
-
-      exports.mark = function (genFun) {
-        if (Object.setPrototypeOf) {
-          Object.setPrototypeOf(genFun, GeneratorFunctionPrototype);
-        } else {
-          genFun.__proto__ = GeneratorFunctionPrototype;
-          define(genFun, toStringTagSymbol, "GeneratorFunction");
-        }
-
-        genFun.prototype = Object.create(Gp);
-        return genFun;
-      }; // Within the body of any async function, `await x` is transformed to
-      // `yield regeneratorRuntime.awrap(x)`, so that the runtime can test
-      // `hasOwn.call(value, "__await")` to determine if the yielded value is
-      // meant to be awaited.
-
-
-      exports.awrap = function (arg) {
-        return {
-          __await: arg
-        };
-      };
-
-      function AsyncIterator(generator, PromiseImpl) {
-        function invoke(method, arg, resolve, reject) {
-          var record = tryCatch(generator[method], generator, arg);
-
-          if (record.type === "throw") {
-            reject(record.arg);
-          } else {
-            var result = record.arg;
-            var value = result.value;
-
-            if (value && _typeof(value) === "object" && hasOwn.call(value, "__await")) {
-              return PromiseImpl.resolve(value.__await).then(function (value) {
-                invoke("next", value, resolve, reject);
-              }, function (err) {
-                invoke("throw", err, resolve, reject);
-              });
-            }
-
-            return PromiseImpl.resolve(value).then(function (unwrapped) {
-              // When a yielded Promise is resolved, its final value becomes
-              // the .value of the Promise<{value,done}> result for the
-              // current iteration.
-              result.value = unwrapped;
-              resolve(result);
-            }, function (error) {
-              // If a rejected Promise was yielded, throw the rejection back
-              // into the async generator function so it can be handled there.
-              return invoke("throw", error, resolve, reject);
-            });
-          }
-        }
-
-        var previousPromise;
-
-        function enqueue(method, arg) {
-          function callInvokeWithMethodAndArg() {
-            return new PromiseImpl(function (resolve, reject) {
-              invoke(method, arg, resolve, reject);
-            });
-          }
-
-          return previousPromise = // If enqueue has been called before, then we want to wait until
-          // all previous Promises have been resolved before calling invoke,
-          // so that results are always delivered in the correct order. If
-          // enqueue has not been called before, then it is important to
-          // call invoke immediately, without waiting on a callback to fire,
-          // so that the async generator function has the opportunity to do
-          // any necessary setup in a predictable way. This predictability
-          // is why the Promise constructor synchronously invokes its
-          // executor callback, and why async functions synchronously
-          // execute code before the first await. Since we implement simple
-          // async functions in terms of async generators, it is especially
-          // important to get this right, even though it requires care.
-          previousPromise ? previousPromise.then(callInvokeWithMethodAndArg, // Avoid propagating failures to Promises returned by later
-          // invocations of the iterator.
-          callInvokeWithMethodAndArg) : callInvokeWithMethodAndArg();
-        } // Define the unified helper method that is used to implement .next,
-        // .throw, and .return (see defineIteratorMethods).
-
-
-        this._invoke = enqueue;
-      }
-
-      defineIteratorMethods(AsyncIterator.prototype);
-
-      AsyncIterator.prototype[asyncIteratorSymbol] = function () {
-        return this;
-      };
-
-      exports.AsyncIterator = AsyncIterator; // Note that simple async functions are implemented on top of
-      // AsyncIterator objects; they just return a Promise for the value of
-      // the final result produced by the iterator.
-
-      exports.async = function (innerFn, outerFn, self, tryLocsList, PromiseImpl) {
-        if (PromiseImpl === void 0) PromiseImpl = Promise;
-        var iter = new AsyncIterator(wrap(innerFn, outerFn, self, tryLocsList), PromiseImpl);
-        return exports.isGeneratorFunction(outerFn) ? iter // If outerFn is a generator, return the full iterator.
-        : iter.next().then(function (result) {
-          return result.done ? result.value : iter.next();
-        });
-      };
-
-      function makeInvokeMethod(innerFn, self, context) {
-        var state = GenStateSuspendedStart;
-        return function invoke(method, arg) {
-          if (state === GenStateExecuting) {
-            throw new Error("Generator is already running");
-          }
-
-          if (state === GenStateCompleted) {
-            if (method === "throw") {
-              throw arg;
-            } // Be forgiving, per 25.3.3.3.3 of the spec:
-            // https://people.mozilla.org/~jorendorff/es6-draft.html#sec-generatorresume
-
-
-            return doneResult();
-          }
-
-          context.method = method;
-          context.arg = arg;
-
-          while (true) {
-            var delegate = context.delegate;
-
-            if (delegate) {
-              var delegateResult = maybeInvokeDelegate(delegate, context);
-
-              if (delegateResult) {
-                if (delegateResult === ContinueSentinel) continue;
-                return delegateResult;
-              }
-            }
-
-            if (context.method === "next") {
-              // Setting context._sent for legacy support of Babel's
-              // function.sent implementation.
-              context.sent = context._sent = context.arg;
-            } else if (context.method === "throw") {
-              if (state === GenStateSuspendedStart) {
-                state = GenStateCompleted;
-                throw context.arg;
-              }
-
-              context.dispatchException(context.arg);
-            } else if (context.method === "return") {
-              context.abrupt("return", context.arg);
-            }
-
-            state = GenStateExecuting;
-            var record = tryCatch(innerFn, self, context);
-
-            if (record.type === "normal") {
-              // If an exception is thrown from innerFn, we leave state ===
-              // GenStateExecuting and loop back for another invocation.
-              state = context.done ? GenStateCompleted : GenStateSuspendedYield;
-
-              if (record.arg === ContinueSentinel) {
-                continue;
-              }
-
-              return {
-                value: record.arg,
-                done: context.done
-              };
-            } else if (record.type === "throw") {
-              state = GenStateCompleted; // Dispatch the exception by looping back around to the
-              // context.dispatchException(context.arg) call above.
-
-              context.method = "throw";
-              context.arg = record.arg;
-            }
-          }
-        };
-      } // Call delegate.iterator[context.method](context.arg) and handle the
-      // result, either by returning a { value, done } result from the
-      // delegate iterator, or by modifying context.method and context.arg,
-      // setting context.delegate to null, and returning the ContinueSentinel.
-
-
-      function maybeInvokeDelegate(delegate, context) {
-        var method = delegate.iterator[context.method];
-
-        if (method === undefined$1) {
-          // A .throw or .return when the delegate iterator has no .throw
-          // method always terminates the yield* loop.
-          context.delegate = null;
-
-          if (context.method === "throw") {
-            // Note: ["return"] must be used for ES3 parsing compatibility.
-            if (delegate.iterator["return"]) {
-              // If the delegate iterator has a return method, give it a
-              // chance to clean up.
-              context.method = "return";
-              context.arg = undefined$1;
-              maybeInvokeDelegate(delegate, context);
-
-              if (context.method === "throw") {
-                // If maybeInvokeDelegate(context) changed context.method from
-                // "return" to "throw", let that override the TypeError below.
-                return ContinueSentinel;
-              }
-            }
-
-            context.method = "throw";
-            context.arg = new TypeError("The iterator does not provide a 'throw' method");
-          }
-
-          return ContinueSentinel;
-        }
-
-        var record = tryCatch(method, delegate.iterator, context.arg);
-
-        if (record.type === "throw") {
-          context.method = "throw";
-          context.arg = record.arg;
-          context.delegate = null;
-          return ContinueSentinel;
-        }
-
-        var info = record.arg;
-
-        if (!info) {
-          context.method = "throw";
-          context.arg = new TypeError("iterator result is not an object");
-          context.delegate = null;
-          return ContinueSentinel;
-        }
-
-        if (info.done) {
-          // Assign the result of the finished delegate to the temporary
-          // variable specified by delegate.resultName (see delegateYield).
-          context[delegate.resultName] = info.value; // Resume execution at the desired location (see delegateYield).
-
-          context.next = delegate.nextLoc; // If context.method was "throw" but the delegate handled the
-          // exception, let the outer generator proceed normally. If
-          // context.method was "next", forget context.arg since it has been
-          // "consumed" by the delegate iterator. If context.method was
-          // "return", allow the original .return call to continue in the
-          // outer generator.
-
-          if (context.method !== "return") {
-            context.method = "next";
-            context.arg = undefined$1;
-          }
-        } else {
-          // Re-yield the result returned by the delegate method.
-          return info;
-        } // The delegate iterator is finished, so forget it and continue with
-        // the outer generator.
-
-
-        context.delegate = null;
-        return ContinueSentinel;
-      } // Define Generator.prototype.{next,throw,return} in terms of the
-      // unified ._invoke helper method.
-
-
-      defineIteratorMethods(Gp);
-      define(Gp, toStringTagSymbol, "Generator"); // A Generator should always return itself as the iterator object when the
-      // @@iterator function is called on it. Some browsers' implementations of the
-      // iterator prototype chain incorrectly implement this, causing the Generator
-      // object to not be returned from this call. This ensures that doesn't happen.
-      // See https://github.com/facebook/regenerator/issues/274 for more details.
-
-      Gp[iteratorSymbol] = function () {
-        return this;
-      };
-
-      Gp.toString = function () {
-        return "[object Generator]";
-      };
-
-      function pushTryEntry(locs) {
-        var entry = {
-          tryLoc: locs[0]
-        };
-
-        if (1 in locs) {
-          entry.catchLoc = locs[1];
-        }
-
-        if (2 in locs) {
-          entry.finallyLoc = locs[2];
-          entry.afterLoc = locs[3];
-        }
-
-        this.tryEntries.push(entry);
-      }
-
-      function resetTryEntry(entry) {
-        var record = entry.completion || {};
-        record.type = "normal";
-        delete record.arg;
-        entry.completion = record;
-      }
-
-      function Context(tryLocsList) {
-        // The root entry object (effectively a try statement without a catch
-        // or a finally block) gives us a place to store values thrown from
-        // locations where there is no enclosing try statement.
-        this.tryEntries = [{
-          tryLoc: "root"
-        }];
-        tryLocsList.forEach(pushTryEntry, this);
-        this.reset(true);
-      }
-
-      exports.keys = function (object) {
-        var keys = [];
-
-        for (var key in object) {
-          keys.push(key);
-        }
-
-        keys.reverse(); // Rather than returning an object with a next method, we keep
-        // things simple and return the next function itself.
-
-        return function next() {
-          while (keys.length) {
-            var key = keys.pop();
-
-            if (key in object) {
-              next.value = key;
-              next.done = false;
-              return next;
-            }
-          } // To avoid creating an additional object, we just hang the .value
-          // and .done properties off the next function object itself. This
-          // also ensures that the minifier will not anonymize the function.
-
-
-          next.done = true;
-          return next;
-        };
-      };
-
-      function values(iterable) {
-        if (iterable) {
-          var iteratorMethod = iterable[iteratorSymbol];
-
-          if (iteratorMethod) {
-            return iteratorMethod.call(iterable);
-          }
-
-          if (typeof iterable.next === "function") {
-            return iterable;
-          }
-
-          if (!isNaN(iterable.length)) {
-            var i = -1,
-                next = function next() {
-              while (++i < iterable.length) {
-                if (hasOwn.call(iterable, i)) {
-                  next.value = iterable[i];
-                  next.done = false;
-                  return next;
-                }
-              }
-
-              next.value = undefined$1;
-              next.done = true;
-              return next;
-            };
-
-            return next.next = next;
-          }
-        } // Return an iterator with no values.
-
-
-        return {
-          next: doneResult
-        };
-      }
-
-      exports.values = values;
-
-      function doneResult() {
-        return {
-          value: undefined$1,
-          done: true
-        };
-      }
-
-      Context.prototype = {
-        constructor: Context,
-        reset: function reset(skipTempReset) {
-          this.prev = 0;
-          this.next = 0; // Resetting context._sent for legacy support of Babel's
-          // function.sent implementation.
-
-          this.sent = this._sent = undefined$1;
-          this.done = false;
-          this.delegate = null;
-          this.method = "next";
-          this.arg = undefined$1;
-          this.tryEntries.forEach(resetTryEntry);
-
-          if (!skipTempReset) {
-            for (var name in this) {
-              // Not sure about the optimal order of these conditions:
-              if (name.charAt(0) === "t" && hasOwn.call(this, name) && !isNaN(+name.slice(1))) {
-                this[name] = undefined$1;
-              }
-            }
-          }
-        },
-        stop: function stop() {
-          this.done = true;
-          var rootEntry = this.tryEntries[0];
-          var rootRecord = rootEntry.completion;
-
-          if (rootRecord.type === "throw") {
-            throw rootRecord.arg;
-          }
-
-          return this.rval;
-        },
-        dispatchException: function dispatchException(exception) {
-          if (this.done) {
-            throw exception;
-          }
-
-          var context = this;
-
-          function handle(loc, caught) {
-            record.type = "throw";
-            record.arg = exception;
-            context.next = loc;
-
-            if (caught) {
-              // If the dispatched exception was caught by a catch block,
-              // then let that catch block handle the exception normally.
-              context.method = "next";
-              context.arg = undefined$1;
-            }
-
-            return !!caught;
-          }
-
-          for (var i = this.tryEntries.length - 1; i >= 0; --i) {
-            var entry = this.tryEntries[i];
-            var record = entry.completion;
-
-            if (entry.tryLoc === "root") {
-              // Exception thrown outside of any try block that could handle
-              // it, so set the completion value of the entire function to
-              // throw the exception.
-              return handle("end");
-            }
-
-            if (entry.tryLoc <= this.prev) {
-              var hasCatch = hasOwn.call(entry, "catchLoc");
-              var hasFinally = hasOwn.call(entry, "finallyLoc");
-
-              if (hasCatch && hasFinally) {
-                if (this.prev < entry.catchLoc) {
-                  return handle(entry.catchLoc, true);
-                } else if (this.prev < entry.finallyLoc) {
-                  return handle(entry.finallyLoc);
-                }
-              } else if (hasCatch) {
-                if (this.prev < entry.catchLoc) {
-                  return handle(entry.catchLoc, true);
-                }
-              } else if (hasFinally) {
-                if (this.prev < entry.finallyLoc) {
-                  return handle(entry.finallyLoc);
-                }
-              } else {
-                throw new Error("try statement without catch or finally");
-              }
-            }
-          }
-        },
-        abrupt: function abrupt(type, arg) {
-          for (var i = this.tryEntries.length - 1; i >= 0; --i) {
-            var entry = this.tryEntries[i];
-
-            if (entry.tryLoc <= this.prev && hasOwn.call(entry, "finallyLoc") && this.prev < entry.finallyLoc) {
-              var finallyEntry = entry;
-              break;
-            }
-          }
-
-          if (finallyEntry && (type === "break" || type === "continue") && finallyEntry.tryLoc <= arg && arg <= finallyEntry.finallyLoc) {
-            // Ignore the finally entry if control is not jumping to a
-            // location outside the try/catch block.
-            finallyEntry = null;
-          }
-
-          var record = finallyEntry ? finallyEntry.completion : {};
-          record.type = type;
-          record.arg = arg;
-
-          if (finallyEntry) {
-            this.method = "next";
-            this.next = finallyEntry.finallyLoc;
-            return ContinueSentinel;
-          }
-
-          return this.complete(record);
-        },
-        complete: function complete(record, afterLoc) {
-          if (record.type === "throw") {
-            throw record.arg;
-          }
-
-          if (record.type === "break" || record.type === "continue") {
-            this.next = record.arg;
-          } else if (record.type === "return") {
-            this.rval = this.arg = record.arg;
-            this.method = "return";
-            this.next = "end";
-          } else if (record.type === "normal" && afterLoc) {
-            this.next = afterLoc;
-          }
-
-          return ContinueSentinel;
-        },
-        finish: function finish(finallyLoc) {
-          for (var i = this.tryEntries.length - 1; i >= 0; --i) {
-            var entry = this.tryEntries[i];
-
-            if (entry.finallyLoc === finallyLoc) {
-              this.complete(entry.completion, entry.afterLoc);
-              resetTryEntry(entry);
-              return ContinueSentinel;
-            }
-          }
-        },
-        "catch": function _catch(tryLoc) {
-          for (var i = this.tryEntries.length - 1; i >= 0; --i) {
-            var entry = this.tryEntries[i];
-
-            if (entry.tryLoc === tryLoc) {
-              var record = entry.completion;
-
-              if (record.type === "throw") {
-                var thrown = record.arg;
-                resetTryEntry(entry);
-              }
-
-              return thrown;
-            }
-          } // The context.catch method must only be called with a location
-          // argument that corresponds to a known catch block.
-
-
-          throw new Error("illegal catch attempt");
-        },
-        delegateYield: function delegateYield(iterable, resultName, nextLoc) {
-          this.delegate = {
-            iterator: values(iterable),
-            resultName: resultName,
-            nextLoc: nextLoc
-          };
-
-          if (this.method === "next") {
-            // Deliberately forget the last sent value so that we don't
-            // accidentally pass it on to the delegate.
-            this.arg = undefined$1;
-          }
-
-          return ContinueSentinel;
-        }
-      }; // Regardless of whether this script is executing as a CommonJS module
-      // or not, return the runtime object so that we can declare the variable
-      // regeneratorRuntime in the outer scope, which allows this module to be
-      // injected easily by `bin/regenerator --include-runtime script.js`.
-
-      return exports;
-    }( // If this script is executing as a CommonJS module, use module.exports
-    // as the regeneratorRuntime namespace. Otherwise create a new empty
-    // object. Either way, the resulting object will be used to initialize
-    // the regeneratorRuntime variable at the top of this file.
-     module.exports );
-
-    try {
-      regeneratorRuntime = runtime;
-    } catch (accidentalStrictMode) {
-      // This module should not be running in strict mode, so the above
-      // assignment should always work unless something is misconfigured. Just
-      // in case runtime.js accidentally runs in strict mode, we can escape
-      // strict mode using a global Function call. This could conceivably fail
-      // if a Content Security Policy forbids using Function, but in that case
-      // the proper solution is to fix the accidental strict mode problem. If
-      // you've misconfigured your bundler to force strict mode and applied a
-      // CSP to forbid Function, and you're not willing to fix either of those
-      // problems, please detail your unique predicament in a GitHub issue.
-      Function("r", "regeneratorRuntime = r")(runtime);
-    }
-  });
-
-  var $includes = arrayIncludes.includes;
-  var USES_TO_LENGTH$2 = arrayMethodUsesToLength('indexOf', {
-    ACCESSORS: true,
-    1: 0
-  }); // `Array.prototype.includes` method
-  // https://tc39.es/ecma262/#sec-array.prototype.includes
-
-  _export({
-    target: 'Array',
-    proto: true,
-    forced: !USES_TO_LENGTH$2
-  }, {
-    includes: function includes(el
-    /* , fromIndex = 0 */
-    ) {
-      return $includes(this, el, arguments.length > 1 ? arguments[1] : undefined);
-    }
-  }); // https://tc39.es/ecma262/#sec-array.prototype-@@unscopables
-
-  addToUnscopables('includes');
-
-  var arrayMethodIsStrict = function arrayMethodIsStrict(METHOD_NAME, argument) {
-    var method = [][METHOD_NAME];
-    return !!method && fails(function () {
-      // eslint-disable-next-line no-useless-call,no-throw-literal
-      method.call(null, argument || function () {
-        throw 1;
-      }, 1);
-    });
-  };
-
-  var $indexOf = arrayIncludes.indexOf;
-  var nativeIndexOf = [].indexOf;
-  var NEGATIVE_ZERO = !!nativeIndexOf && 1 / [1].indexOf(1, -0) < 0;
-  var STRICT_METHOD = arrayMethodIsStrict('indexOf');
-  var USES_TO_LENGTH$3 = arrayMethodUsesToLength('indexOf', {
-    ACCESSORS: true,
-    1: 0
-  }); // `Array.prototype.indexOf` method
-  // https://tc39.es/ecma262/#sec-array.prototype.indexof
-
-  _export({
-    target: 'Array',
-    proto: true,
-    forced: NEGATIVE_ZERO || !STRICT_METHOD || !USES_TO_LENGTH$3
-  }, {
-    indexOf: function indexOf(searchElement
-    /* , fromIndex = 0 */
-    ) {
-      return NEGATIVE_ZERO // convert -0 to +0
-      ? nativeIndexOf.apply(this, arguments) || 0 : $indexOf(this, searchElement, arguments.length > 1 ? arguments[1] : undefined);
-    }
-  });
-
-  var $map = arrayIteration.map;
-  var HAS_SPECIES_SUPPORT$2 = arrayMethodHasSpeciesSupport('map'); // FF49- issue
-
-  var USES_TO_LENGTH$4 = arrayMethodUsesToLength('map'); // `Array.prototype.map` method
-  // https://tc39.es/ecma262/#sec-array.prototype.map
-  // with adding support of @@species
-
-  _export({
-    target: 'Array',
-    proto: true,
-    forced: !HAS_SPECIES_SUPPORT$2 || !USES_TO_LENGTH$4
-  }, {
-    map: function map(callbackfn
-    /* , thisArg */
-    ) {
-      return $map(this, callbackfn, arguments.length > 1 ? arguments[1] : undefined);
-    }
-  });
-
-  var propertyIsEnumerable = objectPropertyIsEnumerable.f; // `Object.{ entries, values }` methods implementation
-
-  var createMethod$4 = function createMethod(TO_ENTRIES) {
-    return function (it) {
-      var O = toIndexedObject(it);
-      var keys = objectKeys(O);
-      var length = keys.length;
-      var i = 0;
-      var result = [];
-      var key;
-
-      while (length > i) {
-        key = keys[i++];
-
-        if (!descriptors || propertyIsEnumerable.call(O, key)) {
-          result.push(TO_ENTRIES ? [key, O[key]] : O[key]);
-        }
-      }
-
-      return result;
-    };
-  };
-
-  var objectToArray = {
-    // `Object.entries` method
-    // https://tc39.es/ecma262/#sec-object.entries
-    entries: createMethod$4(true),
-    // `Object.values` method
-    // https://tc39.es/ecma262/#sec-object.values
-    values: createMethod$4(false)
-  };
-
-  var $entries = objectToArray.entries; // `Object.entries` method
-  // https://tc39.es/ecma262/#sec-object.entries
-
-  _export({
-    target: 'Object',
-    stat: true
-  }, {
-    entries: function entries(O) {
-      return $entries(O);
-    }
-  });
-
-  var FAILS_ON_PRIMITIVES = fails(function () {
-    objectKeys(1);
-  }); // `Object.keys` method
-  // https://tc39.es/ecma262/#sec-object.keys
-
-  _export({
-    target: 'Object',
-    stat: true,
-    forced: FAILS_ON_PRIMITIVES
-  }, {
-    keys: function keys(it) {
-      return objectKeys(toObject(it));
-    }
-  });
-
-  var MATCH = wellKnownSymbol('match'); // `IsRegExp` abstract operation
-  // https://tc39.es/ecma262/#sec-isregexp
-
-  var isRegexp = function isRegexp(it) {
-    var isRegExp;
-    return isObject(it) && ((isRegExp = it[MATCH]) !== undefined ? !!isRegExp : classofRaw(it) == 'RegExp');
-  };
-
-  var notARegexp = function notARegexp(it) {
-    if (isRegexp(it)) {
-      throw TypeError("The method doesn't accept regular expressions");
-    }
-
-    return it;
-  };
-
-  var MATCH$1 = wellKnownSymbol('match');
-
-  var correctIsRegexpLogic = function correctIsRegexpLogic(METHOD_NAME) {
-    var regexp = /./;
-
-    try {
-      '/./'[METHOD_NAME](regexp);
-    } catch (error1) {
-      try {
-        regexp[MATCH$1] = false;
-        return '/./'[METHOD_NAME](regexp);
-      } catch (error2) {
-        /* empty */
-      }
-    }
-
-    return false;
-  };
-
-  // https://tc39.es/ecma262/#sec-string.prototype.includes
-
-
-  _export({
-    target: 'String',
-    proto: true,
-    forced: !correctIsRegexpLogic('includes')
-  }, {
-    includes: function includes(searchString
-    /* , position = 0 */
-    ) {
-      return !!~String(requireObjectCoercible(this)).indexOf(notARegexp(searchString), arguments.length > 1 ? arguments[1] : undefined);
-    }
-  });
-
-  /**
-   * A base-class (or a mixin) adding support for event-listener and dispatchers.
-   */
-
-  /**
-   * Hooks exist to allow users to alter flow.js file processing. This is intended for users relying on a dropzone and other higher-level components
-   * when the flow between `addFiles()` and `upload()` is hardly configurable.
-   * Users calling `await flow.asyncAddFiles()` have more room for customization before calling `upload();` without having to rely upon hooks.
-   *
-   * Hooks can *alter* the parameters they receive (javascript pass-by-reference rules will apply).
-   * For example, the `file-added` hook receives a `flowfile` parameter. `delete flowfile` or `flowfile = {}` have no effect
-   *  because parent function still hold reference. But `delete flowfile.file` would remove the File() and is supported as a way to
-   *  dequeue a file from a list after its initialization.
-   */
-  var HOOKS = ['file-added', 'files-added', 'files-submitted'];
-  /**
-   * Additionally, some hooks are said filtering-hooks.
-   * Code will consider the combined (OR-ed) return value of the callbacks to
-   * decide whether or not keep processing this path/item.
-   */
-
-  var FILTERING_HOOKS = ['filter-file'];
-  /**
-   * Events are recognized (case-sensitive) CustomEvent processed using dispatchEvent.
-   * This is a list of those fire by Flow.js, but any name can be attached too.
-   */
-
-  var EVENTS = ['complete', 'error', 'file-error', 'file-progress', 'file-removed', 'file-retry', 'file-success', 'progress', 'upload-start'];
-  /**
-   * This class:
-   * - add EventListener support to an object.
-   * - wrap EventListener attachment in order to ease their removal
-   * - add the concept of processing hooks similar to native events (explained below) 
-   *
-   * The file is organized in three parts:
-   * 1. isHook, isFilter, isEvent, on, off
-   *    wrap the above concept and offer an unified interface. Whether a callback
-   *    apply to a hook or an event is determined by its name (and the "async" nature of
-   *    the callback).
-   *
-   * 2. Events: addEventListener, removeEventListener and *emit()*
-   *    apply to addition/removal/dispatching of *events*.
-   *
-   * 3. Hooks: addHook, hasHook, removeHook apply to addition/removal of *hooks*.
-   *    - *hook()* trigger the hook execution.
-   *    - *aHook()* is the async counterpart.
-   */
-
-  EventTarget.prototype._addEventListener = EventTarget.prototype.addEventListener;
-  EventTarget.prototype._removeEventListener = EventTarget.prototype.removeEventListener;
-
-  var _default = /*#__PURE__*/function (_EventTarget) {
-    _inherits(_default, _EventTarget);
-
-    var _super = _createSuper(_default);
-
-    /**
-     * List of hooks or events:
-     *  key stands for hook or event name
-     *  value array list of callbacks
-     *
-     * Each key is check against an hardcoded to list to defined whether:
-     * - it's a "native" CustomEvent (dispatched asynchronously dirsregarding its value)
-     * - it's a known event (whether a "filter" or an "action", and in this case, whether
-     *   each callback is asynchronous or not.
-     * @type {}
-     */
-    function _default() {
-      var _this;
-
-      var hooks_events = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
-
-      _classCallCheck(this, _default);
-
-      _this = _super.call(this);
-      _this._events = {};
-      _this._hooks = {};
-      _this._asyncHooks = {};
-      /**
-       * Hooks and events are distinguished based on the name.
-       * Anything not being a know hook is assumed an event
-       */
-
-      for (var _i = 0, _Object$entries = Object.entries(hooks_events); _i < _Object$entries.length; _i++) {
-        var _Object$entries$_i = _slicedToArray(_Object$entries[_i], 2),
-            name = _Object$entries$_i[0],
-            callbacks = _Object$entries$_i[1];
-
-        var _iterator = _createForOfIteratorHelper(callbacks),
-            _step;
-
-        try {
-          for (_iterator.s(); !(_step = _iterator.n()).done;) {
-            var callback = _step.value;
-
-            _this.on(name, callback);
-          }
-        } catch (err) {
-          _iterator.e(err);
-        } finally {
-          _iterator.f();
-        }
-      }
-
-      return _this;
-    }
-
-    _createClass(_default, [{
-      key: "isHook",
-      value: function isHook(name) {
-        return HOOKS.includes(name) || this.isFilter(name);
-      }
-    }, {
-      key: "isFilter",
-      value: function isFilter(name) {
-        return FILTERING_HOOKS.includes(name);
-      }
-    }, {
-      key: "isEvent",
-      value: function isEvent(name) {
-        return !this.isHook(name);
-      }
-    }, {
-      key: "_camelToDashCase",
-      value: function _camelToDashCase(str) {
-        return str.replace(/[A-Z]/g, function (letter) {
-          return "-".concat(letter.toLowerCase());
-        });
-      }
-      /**
-       * A wrapper for addEventListener to alternatively add hooks or events.
-       */
-
-    }, {
-      key: "on",
-      value: function on(event, callback, options) {
-        var revent = this._camelToDashCase(event);
-
-        if (revent != event) {
-          console.warn("Flow.js v3: Do not rely on camel-case (".concat(event, ") event names."));
-
-          if (HOOKS.concat(FILTERING_HOOKS, EVENTS).includes(revent)) {
-            event = revent;
-            console.info("Using \"".concat(revent, "\" instead."));
-          }
-        }
-
-        return this.isEvent(event) ? this.addEventListener(event, callback, options) : this.addHook(event, callback, options);
-      }
-      /**
-       * A wrapper for addEventListener to alternatively add hooks or events.
-       */
-
-    }, {
-      key: "once",
-      value: function once(event, callback, options) {
-        return this.isEvent(event) ? this.addEventListener(event, callback, _objectSpread2(_objectSpread2({}, options), {}, {
-          once: true
-        })) : console.warn('once() is not implemented for hooks.');
-      }
-      /**
-       * A wrapper for removeEventListener to alternatively remove hooks or events.
-       */
-
-    }, {
-      key: "off",
-      value: function off(event, callback, options) {
-        if (this.isEvent(event) || !event) {
-          // console.log(`[event] Remove event listeners...`);
-          this.removeEventListener(event, callback, options);
-        }
-
-        if (!this.isEvent(event) || !event) {
-          // console.log(`[event] Remove hooks...`);
-          this.removeHook(event, callback, options);
-        }
-      }
-      /**
-       * A wrapper around native Target event listeners taken from:
-       * https://github.com/alex2844/js-events
-       *
-       * Return an unbinder() callback, like https://github.com/ai/nanoevents
-       *
-       * @doc: https://developer.mozilla.org/en-US/docs/Web/API/EventTarget
-       */
-
-    }, {
-      key: "addEventListener",
-      value: function addEventListener(event, callback) {
-        var _arguments = arguments,
-            _this2 = this;
-
-        var options = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;
-
-        var _callback = callback,
-            runUnbinder = function runUnbinder() {
-          _this2.removeEventListener(event, callback, options);
-
-          _callback.apply(_this2, _arguments);
-        },
-            unbinder = function unbinder() {
-          _this2.removeEventListener(event, callback, options);
-        };
-
-        if (options && options.once) {
-          callback = runUnbinder;
-        }
-
-        this._addEventListener(event, callback, options);
-
-        if (!this._events) {
-          this._events = {};
-          Object.defineProperty(this, '_events', {
-            enumerable: false
-          });
-        }
-
-        if (!this._events[event]) {
-          this._events[event] = [];
-        }
-
-        this._events[event].push({
-          listener: callback,
-          useCapture: options === true || options.capture || false,
-          passive: options && options.passive || false,
-          once: options && options.once || false,
-          type: event
-        });
-
-        return unbinder;
-      }
-    }, {
-      key: "removeEventListener",
-      value: function removeEventListener(event) {
-        var callback = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : null;
-        var options = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;
-
-        // var callback = e => callback.call(this, ...e.detail);
-        if (callback) {
-          this._removeEventListener(event, callback, options);
-        }
-
-        if (!this._events || event && !this._events[event]) {
-          return;
-        }
-
-        if (!event || event === '*') {
-          for (var _i2 = 0, _Object$keys = Object.keys(this._events); _i2 < _Object$keys.length; _i2++) {
-            var name = _Object$keys[_i2];
-            // console.log('[event] Removing all event listeners');
-            this.removeEventListener(name);
-          }
-
-          return;
-        }
-
-        var _iterator2 = _createForOfIteratorHelper(this._events[event].entries()),
-            _step2;
-
-        try {
-          for (_iterator2.s(); !(_step2 = _iterator2.n()).done;) {
-            var _step2$value = _slicedToArray(_step2.value, 2),
-                i = _step2$value[0],
-                v = _step2$value[1];
-
-            if ((!callback || v.listener == callback) && v.useCapture == options) {
-              // console.log(`[event] Removed one callback from "${event}"`);
-              this._events[event].splice(i, 1);
-
-              if (!callback) {
-                this._removeEventListener(event, v.listener, v);
-              } else {
-                break;
-              }
-            }
-          }
-        } catch (err) {
-          _iterator2.e(err);
-        } finally {
-          _iterator2.f();
-        }
-
-        if (this._events[event].length == 0) {
-          delete this._events[event];
-        }
-      }
-      /**
-       * A wrapper for dispatchEvent handling "catch-all"
-       */
-
-    }, {
-      key: "emit",
-      value: function () {
-        var _emit = _asyncToGenerator( /*#__PURE__*/regeneratorRuntime.mark(function _callee(name) {
-          var _len,
-              args,
-              _key,
-              _args = arguments;
-
-          return regeneratorRuntime.wrap(function _callee$(_context) {
-            while (1) {
-              switch (_context.prev = _context.next) {
-                case 0:
-                  for (_len = _args.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
-                    args[_key - 1] = _args[_key];
-                  }
-
-                  // console.log(`[event] Fire native event "${name}"${args.length ? ' with ' + args.length + ' arguments' : ''}`);
-                  this.dispatchEvent(new CustomEvent(name, {
-                    detail: args
-                  }));
-
-                  if (name != 'catch-all') {
-                    this.emitCatchAll.apply(this, [name].concat(args));
-                  }
-
-                case 3:
-                case "end":
-                  return _context.stop();
-              }
-            }
-          }, _callee, this);
-        }));
-
-        function emit(_x) {
-          return _emit.apply(this, arguments);
-        }
-
-        return emit;
-      }()
-    }, {
-      key: "emitCatchAll",
-      value: function () {
-        var _emitCatchAll = _asyncToGenerator( /*#__PURE__*/regeneratorRuntime.mark(function _callee2(name) {
-          var _len2,
-              args,
-              _key2,
-              _args2 = arguments;
-
-          return regeneratorRuntime.wrap(function _callee2$(_context2) {
-            while (1) {
-              switch (_context2.prev = _context2.next) {
-                case 0:
-                  for (_len2 = _args2.length, args = new Array(_len2 > 1 ? _len2 - 1 : 0), _key2 = 1; _key2 < _len2; _key2++) {
-                    args[_key2 - 1] = _args2[_key2];
-                  }
-
-                  this.dispatchEvent(new CustomEvent('catch-all', {
-                    detail: [name].concat(args)
-                  }));
-
-                case 2:
-                case "end":
-                  return _context2.stop();
-              }
-            }
-          }, _callee2, this);
-        }));
-
-        function emitCatchAll(_x2) {
-          return _emitCatchAll.apply(this, arguments);
-        }
-
-        return emitCatchAll;
-      }()
-      /**
-       * ### HOOKS ###
-       */
-
-    }, {
-      key: "addHook",
-      value: function addHook(event, callback, options) {
-        var isAsync = callback.constructor.name === 'AsyncFunction',
-            target = isAsync ? this._asyncHooks : this._hooks;
-
-        if (!target.hasOwnProperty(event)) {
-          target[event] = [];
-        }
-
-        target[event].push(callback);
-      }
-    }, {
-      key: "hasHook",
-      value: function hasHook(async, events) {
-        events = typeof events === 'string' ? [events] : events || [];
-        var target = async ? this._asyncHooks : this._hooks;
-
-        for (var _i3 = 0, _Object$entries2 = Object.entries(target); _i3 < _Object$entries2.length; _i3++) {
-          var _Object$entries2$_i = _slicedToArray(_Object$entries2[_i3], 2),
-              k = _Object$entries2$_i[0],
-              v = _Object$entries2$_i[1];
-
-          if (events.length > 0 && !events.includes(k)) {
-            continue;
-          }
-
-          if (v.length > 0) {
-            return true;
-          }
-        }
-
-        return false;
-      }
-      /**
-       * Remove one of more hooks' callbacks.
-       */
-
-    }, {
-      key: "removeHook",
-      value: function removeHook(event, callback, options) {
-        var arrayRemove = function arrayRemove(array, value) {
-          var index = array.indexOf(value);
-
-          if (index > -1) {
-            array.splice(index, 1);
-          }
-        };
-
-        if (event && event != '*') {
-          if (callback) {
-            var isAsync = callback.constructor.name === 'AsyncFunction',
-                target = isAsync ? this._asyncHooks : this._hooks;
-
-            if (target.hasOwnProperty(event)) {
-              arrayRemove(target[event], callback);
-            }
-          } else {
-            delete this._hooks[event];
-            delete this._asyncHooks[event];
-          }
-        } else {
-          this._hooks = {};
-          this._asyncHooks = {};
-        }
-      }
-      /**
-       * Run a synchronous hook (action or filter).
-       *
-       * @param {string} event event name
-       * @param {...} args arguments of a callback
-       *
-       * @return {bool} In the case of *filters*, indicates whether processing must continue.
-       * @return null   In the case of *actions*.
-       */
-
-    }, {
-      key: "hook",
-      value: function hook(name) {
-        var value,
-            preventDefault = false,
-            isFilter = this.isFilter(name),
-            callbacks = this._hooks[name] || [];
-
-        for (var _len3 = arguments.length, args = new Array(_len3 > 1 ? _len3 - 1 : 0), _key3 = 1; _key3 < _len3; _key3++) {
-          args[_key3 - 1] = arguments[_key3];
-        }
-
-        var _iterator3 = _createForOfIteratorHelper(callbacks),
-            _step3;
-
-        try {
-          for (_iterator3.s(); !(_step3 = _iterator3.n()).done;) {
-            var callback = _step3.value;
-            // console.log(`[event] Fire hook "${name}"${args.length ? ' with ' + args.length + ' arguments' : ''}`);
-            value = callback.apply(this, args);
-
-            if (name === 'file-added' && value === false) {
-              console.warn('In Flow.js 3.x, file-added event is an action rather than a fitler. return value is ignored but removing the `file` property allows to skip an enqueued file.');
-            }
-
-            if (isFilter) {
-              // console.log(`[filter-event] ${event} returned:`, item.value);
-              preventDefault |= value === false;
-            } else {// Changes happen by reference. We ignore iterator.next().value.
-            }
-          }
-        } catch (err) {
-          _iterator3.e(err);
-        } finally {
-          _iterator3.f();
-        }
-
-        this.emitCatchAll.apply(this, [name].concat(args));
-        return isFilter ? !preventDefault : null;
-      }
-      /**
-       * Run an asynchronous hook (action or filter).
-       *
-       * @param {string} event event name
-       * @param {...} args arguments of a callback
-       *
-       * @return {bool} In the case of *filters*, indicates whether processing must continue.
-       * @return {mixed} In the case of *actions*: The first argument (possibly modified by hooks).
-       */
-
-    }, {
-      key: "aHook",
-      value: function () {
-        var _aHook = _asyncToGenerator( /*#__PURE__*/regeneratorRuntime.mark(function _callee3(name) {
-          var _this3 = this;
-
-          var _len4,
-              args,
-              _key4,
-              calls,
-              isFilter,
-              returns,
-              _args3 = arguments;
-
-          return regeneratorRuntime.wrap(function _callee3$(_context3) {
-            while (1) {
-              switch (_context3.prev = _context3.next) {
-                case 0:
-                  for (_len4 = _args3.length, args = new Array(_len4 > 1 ? _len4 - 1 : 0), _key4 = 1; _key4 < _len4; _key4++) {
-                    args[_key4 - 1] = _args3[_key4];
-                  }
-
-                  calls = this._asyncHooks[name] || [], isFilter = this.isFilter(name);
-
-                  if (calls.length) {
-                    _context3.next = 4;
-                    break;
-                  }
-
-                  return _context3.abrupt("return", isFilter ? true : args[0]);
-
-                case 4:
-                  _context3.next = 6;
-                  return Promise.all(calls.map(function (e) {
-                    return e.apply(_this3, args);
-                  }));
-
-                case 6:
-                  returns = _context3.sent;
-                  this.emitCatchAll.apply(this, [name].concat(args));
-                  return _context3.abrupt("return", isFilter ? returns.include(false) : returns);
-
-                case 9:
-                case "end":
-                  return _context3.stop();
-              }
-            }
-          }, _callee3, this);
-        }));
-
-        function aHook(_x3) {
-          return _aHook.apply(this, arguments);
-        }
-
-        return aHook;
-      }()
-    }]);
-
-    return _default;
-  }( /*#__PURE__*/_wrapNativeSuper(EventTarget));
-
-  var min$4 = Math.min;
-  var nativeLastIndexOf = [].lastIndexOf;
-  var NEGATIVE_ZERO$1 = !!nativeLastIndexOf && 1 / [1].lastIndexOf(1, -0) < 0;
-  var STRICT_METHOD$1 = arrayMethodIsStrict('lastIndexOf'); // For preventing possible almost infinite loop in non-standard implementations, test the forward version of the method
-
-  var USES_TO_LENGTH$5 = arrayMethodUsesToLength('indexOf', {
-    ACCESSORS: true,
-    1: 0
-  });
-  var FORCED$2 = NEGATIVE_ZERO$1 || !STRICT_METHOD$1 || !USES_TO_LENGTH$5; // `Array.prototype.lastIndexOf` method implementation
-  // https://tc39.es/ecma262/#sec-array.prototype.lastindexof
-
-  var arrayLastIndexOf = FORCED$2 ? function lastIndexOf(searchElement
-  /* , fromIndex = @[*-1] */
-  ) {
-    // convert -0 to +0
-    if (NEGATIVE_ZERO$1) return nativeLastIndexOf.apply(this, arguments) || 0;
-    var O = toIndexedObject(this);
-    var length = toLength(O.length);
-    var index = length - 1;
-    if (arguments.length > 1) index = min$4(index, toInteger(arguments[1]));
-    if (index < 0) index = length + index;
-
-    for (; index >= 0; index--) {
-      if (index in O && O[index] === searchElement) return index || 0;
-    }
-
-    return -1;
-  } : nativeLastIndexOf;
-
-  // https://tc39.es/ecma262/#sec-array.prototype.lastindexof
-
-  _export({
-    target: 'Array',
-    proto: true,
-    forced: arrayLastIndexOf !== [].lastIndexOf
-  }, {
-    lastIndexOf: arrayLastIndexOf
-  });
-
-  var arrayPush = [].push;
-  var min$5 = Math.min;
-  var MAX_UINT32 = 0xFFFFFFFF; // babel-minify transpiles RegExp('x', 'y') -> /x/y and it causes SyntaxError
-
-  var SUPPORTS_Y = !fails(function () {
-    return !RegExp(MAX_UINT32, 'y');
-  }); // @@split logic
-
-  fixRegexpWellKnownSymbolLogic('split', 2, function (SPLIT, nativeSplit, maybeCallNative) {
-    var internalSplit;
-
-    if ('abbc'.split(/(b)*/)[1] == 'c' || 'test'.split(/(?:)/, -1).length != 4 || 'ab'.split(/(?:ab)*/).length != 2 || '.'.split(/(.?)(.?)/).length != 4 || '.'.split(/()()/).length > 1 || ''.split(/.?/).length) {
-      // based on es5-shim implementation, need to rework it
-      internalSplit = function internalSplit(separator, limit) {
-        var string = String(requireObjectCoercible(this));
-        var lim = limit === undefined ? MAX_UINT32 : limit >>> 0;
-        if (lim === 0) return [];
-        if (separator === undefined) return [string]; // If `separator` is not a regex, use native split
-
-        if (!isRegexp(separator)) {
-          return nativeSplit.call(string, separator, lim);
-        }
-
-        var output = [];
-        var flags = (separator.ignoreCase ? 'i' : '') + (separator.multiline ? 'm' : '') + (separator.unicode ? 'u' : '') + (separator.sticky ? 'y' : '');
-        var lastLastIndex = 0; // Make `global` and avoid `lastIndex` issues by working with a copy
-
-        var separatorCopy = new RegExp(separator.source, flags + 'g');
-        var match, lastIndex, lastLength;
-
-        while (match = regexpExec.call(separatorCopy, string)) {
-          lastIndex = separatorCopy.lastIndex;
-
-          if (lastIndex > lastLastIndex) {
-            output.push(string.slice(lastLastIndex, match.index));
-            if (match.length > 1 && match.index < string.length) arrayPush.apply(output, match.slice(1));
-            lastLength = match[0].length;
-            lastLastIndex = lastIndex;
-            if (output.length >= lim) break;
-          }
-
-          if (separatorCopy.lastIndex === match.index) separatorCopy.lastIndex++; // Avoid an infinite loop
-        }
-
-        if (lastLastIndex === string.length) {
-          if (lastLength || !separatorCopy.test('')) output.push('');
-        } else output.push(string.slice(lastLastIndex));
-
-        return output.length > lim ? output.slice(0, lim) : output;
-      }; // Chakra, V8
-
-    } else if ('0'.split(undefined, 0).length) {
-      internalSplit = function internalSplit(separator, limit) {
-        return separator === undefined && limit === 0 ? [] : nativeSplit.call(this, separator, limit);
-      };
-    } else internalSplit = nativeSplit;
-
-    return [// `String.prototype.split` method
-    // https://tc39.es/ecma262/#sec-string.prototype.split
-    function split(separator, limit) {
-      var O = requireObjectCoercible(this);
-      var splitter = separator == undefined ? undefined : separator[SPLIT];
-      return splitter !== undefined ? splitter.call(separator, O, limit) : internalSplit.call(String(O), separator, limit);
-    }, // `RegExp.prototype[@@split]` method
-    // https://tc39.es/ecma262/#sec-regexp.prototype-@@split
-    //
-    // NOTE: This cannot be properly polyfilled in engines that don't support
-    // the 'y' flag.
-    function (regexp, limit) {
-      var res = maybeCallNative(internalSplit, regexp, this, limit, internalSplit !== nativeSplit);
-      if (res.done) return res.value;
-      var rx = anObject(regexp);
-      var S = String(this);
-      var C = speciesConstructor(rx, RegExp);
-      var unicodeMatching = rx.unicode;
-      var flags = (rx.ignoreCase ? 'i' : '') + (rx.multiline ? 'm' : '') + (rx.unicode ? 'u' : '') + (SUPPORTS_Y ? 'y' : 'g'); // ^(? + rx + ) is needed, in combination with some S slicing, to
-      // simulate the 'y' flag.
-
-      var splitter = new C(SUPPORTS_Y ? rx : '^(?:' + rx.source + ')', flags);
-      var lim = limit === undefined ? MAX_UINT32 : limit >>> 0;
-      if (lim === 0) return [];
-      if (S.length === 0) return regexpExecAbstract(splitter, S) === null ? [S] : [];
-      var p = 0;
-      var q = 0;
-      var A = [];
-
-      while (q < S.length) {
-        splitter.lastIndex = SUPPORTS_Y ? q : 0;
-        var z = regexpExecAbstract(splitter, SUPPORTS_Y ? S : S.slice(q));
-        var e;
-
-        if (z === null || (e = min$5(toLength(splitter.lastIndex + (SUPPORTS_Y ? 0 : q)), S.length)) === p) {
-          q = advanceStringIndex(S, q, unicodeMatching);
-        } else {
-          A.push(S.slice(p, q));
-          if (A.length === lim) return A;
-
-          for (var i = 1; i <= z.length - 1; i++) {
-            A.push(z[i]);
-            if (A.length === lim) return A;
-          }
-
-          q = p = e;
-        }
-      }
-
-      A.push(S.slice(p));
-      return A;
-    }];
-  }, !SUPPORTS_Y);
-
-  var nativeJoin = [].join;
-  var ES3_STRINGS = indexedObject != Object;
-  var STRICT_METHOD$2 = arrayMethodIsStrict('join', ','); // `Array.prototype.join` method
-  // https://tc39.es/ecma262/#sec-array.prototype.join
-
-  _export({
-    target: 'Array',
-    proto: true,
-    forced: ES3_STRINGS || !STRICT_METHOD$2
-  }, {
-    join: function join(separator) {
-      return nativeJoin.call(toIndexedObject(this), separator === undefined ? ',' : separator);
-    }
-  });
-
-  var HAS_SPECIES_SUPPORT$3 = arrayMethodHasSpeciesSupport('slice');
-  var USES_TO_LENGTH$6 = arrayMethodUsesToLength('slice', {
-    ACCESSORS: true,
-    0: 0,
-    1: 2
-  });
-  var SPECIES$6 = wellKnownSymbol('species');
-  var nativeSlice = [].slice;
-  var max$3 = Math.max; // `Array.prototype.slice` method
-  // https://tc39.es/ecma262/#sec-array.prototype.slice
-  // fallback for not array-like ES3 strings and DOM objects
-
-  _export({
-    target: 'Array',
-    proto: true,
-    forced: !HAS_SPECIES_SUPPORT$3 || !USES_TO_LENGTH$6
-  }, {
-    slice: function slice(start, end) {
-      var O = toIndexedObject(this);
-      var length = toLength(O.length);
-      var k = toAbsoluteIndex(start, length);
-      var fin = toAbsoluteIndex(end === undefined ? length : end, length); // inline `ArraySpeciesCreate` for usage native `Array#slice` where it's possible
-
-      var Constructor, result, n;
-
-      if (isArray(O)) {
-        Constructor = O.constructor; // cross-realm fallback
-
-        if (typeof Constructor == 'function' && (Constructor === Array || isArray(Constructor.prototype))) {
-          Constructor = undefined;
-        } else if (isObject(Constructor)) {
-          Constructor = Constructor[SPECIES$6];
-          if (Constructor === null) Constructor = undefined;
-        }
-
-        if (Constructor === Array || Constructor === undefined) {
-          return nativeSlice.call(O, k, fin);
-        }
-      }
-
-      result = new (Constructor === undefined ? Array : Constructor)(max$3(fin - k, 0));
-
-      for (n = 0; k < fin; k++, n++) {
-        if (k in O) createProperty(result, n, O[k]);
-      }
-
-      result.length = n;
-      return result;
-    }
-  });
-
-  /**
-   * Default read function using the webAPI
-   *
-   * @function webAPIFileRead(fileObj, startByte, endByte, fileType, chunk)
-   *
-   */
-  function webAPIFileRead(fileObj, startByte, endByte, fileType, chunk) {
-    var function_name = 'slice';
-    if (fileObj.file.slice) function_name = 'slice';else if (fileObj.file.mozSlice) function_name = 'mozSlice';else if (fileObj.file.webkitSlice) function_name = 'webkitSlice';
-    chunk.readFinished(fileObj.file[function_name](startByte, endByte, fileType));
-  }
-  /**
-   * If option is a function, evaluate it with given params
-   * @param {*} data
-   * @param {...} args arguments of a callback
-   * @returns {*}
-   */
-
-
-  function evalOpts(data, args) {
-    if (typeof data === "function") {
-      // `arguments` is an object, not array, in FF, so:
-      args = Array.prototype.slice.call(arguments);
-      data = data.apply(null, args.slice(1));
-    }
-
-    return data;
-  }
-  /**
-   * Iterate each element of an object
-   * @function
-   * @param {Array|Object} obj object or an array to iterate
-   * @param {Function} callback first argument is a value and second is a key.
-   * @param {Object=} context Object to become context (`this`) for the iterator function.
-   */
-
-
-  function each(obj, callback, context) {
-    if (!obj) {
-      return;
-    }
-
-    var key; // Is Array?
-    // Array.isArray won't work, not only arrays can be iterated by index https://github.com/flowjs/ng-flow/issues/236#
-
-    if (typeof obj.length !== 'undefined') {
-      for (key = 0; key < obj.length; key++) {
-        if (callback.call(context, obj[key], key) === false) {
-          return;
-        }
-      }
-    } else {
-      for (key in obj) {
-        if (obj.hasOwnProperty(key) && callback.call(context, obj[key], key) === false) {
-          return;
-        }
-      }
-    }
-  }
-  /**
-   * Exclusively for test purposes
-   * (Until Grunt+Karma+Jasmine can allow test to use (ES) `import` of tools.js)
-   */
-
-
-  var g = typeof window !== 'undefined' ? window : typeof global !== 'undefined' ? global : typeof self !== 'undefined' ? self : {};
-  g.evalOpts = evalOpts;
-
-  var nativeGetOwnPropertyNames = objectGetOwnPropertyNames.f;
-  var toString$1 = {}.toString;
-  var windowNames = (typeof window === "undefined" ? "undefined" : _typeof(window)) == 'object' && window && Object.getOwnPropertyNames ? Object.getOwnPropertyNames(window) : [];
-
-  var getWindowNames = function getWindowNames(it) {
-    try {
-      return nativeGetOwnPropertyNames(it);
-    } catch (error) {
-      return windowNames.slice();
-    }
-  }; // fallback for IE11 buggy Object.getOwnPropertyNames with iframe and window
-
-
-  var f$6 = function getOwnPropertyNames(it) {
-    return windowNames && toString$1.call(it) == '[object Window]' ? getWindowNames(it) : nativeGetOwnPropertyNames(toIndexedObject(it));
-  };
-
-  var objectGetOwnPropertyNamesExternal = {
-    f: f$6
-  };
-
-  var f$7 = wellKnownSymbol;
-  var wellKnownSymbolWrapped = {
-    f: f$7
-  };
-
-  var defineProperty$5 = objectDefineProperty.f;
-
-  var defineWellKnownSymbol = function defineWellKnownSymbol(NAME) {
-    var _Symbol = path.Symbol || (path.Symbol = {});
-
-    if (!has(_Symbol, NAME)) defineProperty$5(_Symbol, NAME, {
-      value: wellKnownSymbolWrapped.f(NAME)
-    });
-  };
-
-  var $forEach = arrayIteration.forEach;
-  var HIDDEN = sharedKey('hidden');
-  var SYMBOL = 'Symbol';
-  var PROTOTYPE$1 = 'prototype';
-  var TO_PRIMITIVE = wellKnownSymbol('toPrimitive');
-  var setInternalState$3 = internalState.set;
-  var getInternalState$3 = internalState.getterFor(SYMBOL);
-  var ObjectPrototype$1 = Object[PROTOTYPE$1];
-  var $Symbol = global$1.Symbol;
-  var $stringify = getBuiltIn('JSON', 'stringify');
-  var nativeGetOwnPropertyDescriptor$1 = objectGetOwnPropertyDescriptor.f;
-  var nativeDefineProperty$1 = objectDefineProperty.f;
-  var nativeGetOwnPropertyNames$1 = objectGetOwnPropertyNamesExternal.f;
-  var nativePropertyIsEnumerable$1 = objectPropertyIsEnumerable.f;
-  var AllSymbols = shared('symbols');
-  var ObjectPrototypeSymbols = shared('op-symbols');
-  var StringToSymbolRegistry = shared('string-to-symbol-registry');
-  var SymbolToStringRegistry = shared('symbol-to-string-registry');
-  var WellKnownSymbolsStore$1 = shared('wks');
-  var QObject = global$1.QObject; // Don't use setters in Qt Script, https://github.com/zloirock/core-js/issues/173
-
-  var USE_SETTER = !QObject || !QObject[PROTOTYPE$1] || !QObject[PROTOTYPE$1].findChild; // fallback for old Android, https://code.google.com/p/v8/issues/detail?id=687
-
-  var setSymbolDescriptor = descriptors && fails(function () {
-    return objectCreate(nativeDefineProperty$1({}, 'a', {
-      get: function get() {
-        return nativeDefineProperty$1(this, 'a', {
-          value: 7
-        }).a;
-      }
-    })).a != 7;
-  }) ? function (O, P, Attributes) {
-    var ObjectPrototypeDescriptor = nativeGetOwnPropertyDescriptor$1(ObjectPrototype$1, P);
-    if (ObjectPrototypeDescriptor) delete ObjectPrototype$1[P];
-    nativeDefineProperty$1(O, P, Attributes);
-
-    if (ObjectPrototypeDescriptor && O !== ObjectPrototype$1) {
-      nativeDefineProperty$1(ObjectPrototype$1, P, ObjectPrototypeDescriptor);
-    }
-  } : nativeDefineProperty$1;
-
-  var wrap = function wrap(tag, description) {
-    var symbol = AllSymbols[tag] = objectCreate($Symbol[PROTOTYPE$1]);
-    setInternalState$3(symbol, {
-      type: SYMBOL,
-      tag: tag,
-      description: description
-    });
-    if (!descriptors) symbol.description = description;
-    return symbol;
-  };
-
-  var isSymbol = useSymbolAsUid ? function (it) {
-    return _typeof(it) == 'symbol';
-  } : function (it) {
-    return Object(it) instanceof $Symbol;
-  };
-
-  var $defineProperty = function defineProperty(O, P, Attributes) {
-    if (O === ObjectPrototype$1) $defineProperty(ObjectPrototypeSymbols, P, Attributes);
-    anObject(O);
-    var key = toPrimitive(P, true);
-    anObject(Attributes);
-
-    if (has(AllSymbols, key)) {
-      if (!Attributes.enumerable) {
-        if (!has(O, HIDDEN)) nativeDefineProperty$1(O, HIDDEN, createPropertyDescriptor(1, {}));
-        O[HIDDEN][key] = true;
-      } else {
-        if (has(O, HIDDEN) && O[HIDDEN][key]) O[HIDDEN][key] = false;
-        Attributes = objectCreate(Attributes, {
-          enumerable: createPropertyDescriptor(0, false)
-        });
-      }
-
-      return setSymbolDescriptor(O, key, Attributes);
-    }
-
-    return nativeDefineProperty$1(O, key, Attributes);
-  };
-
-  var $defineProperties = function defineProperties(O, Properties) {
-    anObject(O);
-    var properties = toIndexedObject(Properties);
-    var keys = objectKeys(properties).concat($getOwnPropertySymbols(properties));
-    $forEach(keys, function (key) {
-      if (!descriptors || $propertyIsEnumerable.call(properties, key)) $defineProperty(O, key, properties[key]);
-    });
-    return O;
-  };
-
-  var $create = function create(O, Properties) {
-    return Properties === undefined ? objectCreate(O) : $defineProperties(objectCreate(O), Properties);
-  };
-
-  var $propertyIsEnumerable = function propertyIsEnumerable(V) {
-    var P = toPrimitive(V, true);
-    var enumerable = nativePropertyIsEnumerable$1.call(this, P);
-    if (this === ObjectPrototype$1 && has(AllSymbols, P) && !has(ObjectPrototypeSymbols, P)) return false;
-    return enumerable || !has(this, P) || !has(AllSymbols, P) || has(this, HIDDEN) && this[HIDDEN][P] ? enumerable : true;
-  };
-
-  var $getOwnPropertyDescriptor = function getOwnPropertyDescriptor(O, P) {
-    var it = toIndexedObject(O);
-    var key = toPrimitive(P, true);
-    if (it === ObjectPrototype$1 && has(AllSymbols, key) && !has(ObjectPrototypeSymbols, key)) return;
-    var descriptor = nativeGetOwnPropertyDescriptor$1(it, key);
-
-    if (descriptor && has(AllSymbols, key) && !(has(it, HIDDEN) && it[HIDDEN][key])) {
-      descriptor.enumerable = true;
-    }
-
-    return descriptor;
-  };
-
-  var $getOwnPropertyNames = function getOwnPropertyNames(O) {
-    var names = nativeGetOwnPropertyNames$1(toIndexedObject(O));
-    var result = [];
-    $forEach(names, function (key) {
-      if (!has(AllSymbols, key) && !has(hiddenKeys, key)) result.push(key);
-    });
-    return result;
-  };
-
-  var $getOwnPropertySymbols = function getOwnPropertySymbols(O) {
-    var IS_OBJECT_PROTOTYPE = O === ObjectPrototype$1;
-    var names = nativeGetOwnPropertyNames$1(IS_OBJECT_PROTOTYPE ? ObjectPrototypeSymbols : toIndexedObject(O));
-    var result = [];
-    $forEach(names, function (key) {
-      if (has(AllSymbols, key) && (!IS_OBJECT_PROTOTYPE || has(ObjectPrototype$1, key))) {
-        result.push(AllSymbols[key]);
-      }
-    });
-    return result;
-  }; // `Symbol` constructor
-  // https://tc39.es/ecma262/#sec-symbol-constructor
-
-
-  if (!nativeSymbol) {
-    $Symbol = function _Symbol() {
-      if (this instanceof $Symbol) throw TypeError('Symbol is not a constructor');
-      var description = !arguments.length || arguments[0] === undefined ? undefined : String(arguments[0]);
-      var tag = uid(description);
-
-      var setter = function setter(value) {
-        if (this === ObjectPrototype$1) setter.call(ObjectPrototypeSymbols, value);
-        if (has(this, HIDDEN) && has(this[HIDDEN], tag)) this[HIDDEN][tag] = false;
-        setSymbolDescriptor(this, tag, createPropertyDescriptor(1, value));
-      };
-
-      if (descriptors && USE_SETTER) setSymbolDescriptor(ObjectPrototype$1, tag, {
-        configurable: true,
-        set: setter
-      });
-      return wrap(tag, description);
-    };
-
-    redefine($Symbol[PROTOTYPE$1], 'toString', function toString() {
-      return getInternalState$3(this).tag;
-    });
-    redefine($Symbol, 'withoutSetter', function (description) {
-      return wrap(uid(description), description);
-    });
-    objectPropertyIsEnumerable.f = $propertyIsEnumerable;
-    objectDefineProperty.f = $defineProperty;
-    objectGetOwnPropertyDescriptor.f = $getOwnPropertyDescriptor;
-    objectGetOwnPropertyNames.f = objectGetOwnPropertyNamesExternal.f = $getOwnPropertyNames;
-    objectGetOwnPropertySymbols.f = $getOwnPropertySymbols;
-
-    wellKnownSymbolWrapped.f = function (name) {
-      return wrap(wellKnownSymbol(name), name);
-    };
-
-    if (descriptors) {
-      // https://github.com/tc39/proposal-Symbol-description
-      nativeDefineProperty$1($Symbol[PROTOTYPE$1], 'description', {
-        configurable: true,
-        get: function description() {
-          return getInternalState$3(this).description;
-        }
-      });
-
-      {
-        redefine(ObjectPrototype$1, 'propertyIsEnumerable', $propertyIsEnumerable, {
-          unsafe: true
-        });
-      }
-    }
-  }
-
-  _export({
-    global: true,
-    wrap: true,
-    forced: !nativeSymbol,
-    sham: !nativeSymbol
-  }, {
-    Symbol: $Symbol
-  });
-  $forEach(objectKeys(WellKnownSymbolsStore$1), function (name) {
-    defineWellKnownSymbol(name);
-  });
-  _export({
-    target: SYMBOL,
-    stat: true,
-    forced: !nativeSymbol
-  }, {
-    // `Symbol.for` method
-    // https://tc39.es/ecma262/#sec-symbol.for
-    'for': function _for(key) {
-      var string = String(key);
-      if (has(StringToSymbolRegistry, string)) return StringToSymbolRegistry[string];
-      var symbol = $Symbol(string);
-      StringToSymbolRegistry[string] = symbol;
-      SymbolToStringRegistry[symbol] = string;
-      return symbol;
-    },
-    // `Symbol.keyFor` method
-    // https://tc39.es/ecma262/#sec-symbol.keyfor
-    keyFor: function keyFor(sym) {
-      if (!isSymbol(sym)) throw TypeError(sym + ' is not a symbol');
-      if (has(SymbolToStringRegistry, sym)) return SymbolToStringRegistry[sym];
-    },
-    useSetter: function useSetter() {
-      USE_SETTER = true;
-    },
-    useSimple: function useSimple() {
-      USE_SETTER = false;
-    }
-  });
-  _export({
-    target: 'Object',
-    stat: true,
-    forced: !nativeSymbol,
-    sham: !descriptors
-  }, {
-    // `Object.create` method
-    // https://tc39.es/ecma262/#sec-object.create
-    create: $create,
-    // `Object.defineProperty` method
-    // https://tc39.es/ecma262/#sec-object.defineproperty
-    defineProperty: $defineProperty,
-    // `Object.defineProperties` method
-    // https://tc39.es/ecma262/#sec-object.defineproperties
-    defineProperties: $defineProperties,
-    // `Object.getOwnPropertyDescriptor` method
-    // https://tc39.es/ecma262/#sec-object.getownpropertydescriptors
-    getOwnPropertyDescriptor: $getOwnPropertyDescriptor
-  });
-  _export({
-    target: 'Object',
-    stat: true,
-    forced: !nativeSymbol
-  }, {
-    // `Object.getOwnPropertyNames` method
-    // https://tc39.es/ecma262/#sec-object.getownpropertynames
-    getOwnPropertyNames: $getOwnPropertyNames,
-    // `Object.getOwnPropertySymbols` method
-    // https://tc39.es/ecma262/#sec-object.getownpropertysymbols
-    getOwnPropertySymbols: $getOwnPropertySymbols
-  }); // Chrome 38 and 39 `Object.getOwnPropertySymbols` fails on primitives
-  // https://bugs.chromium.org/p/v8/issues/detail?id=3443
-
-  _export({
-    target: 'Object',
-    stat: true,
-    forced: fails(function () {
-      objectGetOwnPropertySymbols.f(1);
-    })
-  }, {
-    getOwnPropertySymbols: function getOwnPropertySymbols(it) {
-      return objectGetOwnPropertySymbols.f(toObject(it));
-    }
-  }); // `JSON.stringify` method behavior with symbols
-  // https://tc39.es/ecma262/#sec-json.stringify
-
-  if ($stringify) {
-    var FORCED_JSON_STRINGIFY = !nativeSymbol || fails(function () {
-      var symbol = $Symbol(); // MS Edge converts symbol values to JSON as {}
-
-      return $stringify([symbol]) != '[null]' // WebKit converts symbol values to JSON as null
-      || $stringify({
-        a: symbol
-      }) != '{}' // V8 throws on boxed symbols
-      || $stringify(Object(symbol)) != '{}';
-    });
-    _export({
-      target: 'JSON',
-      stat: true,
-      forced: FORCED_JSON_STRINGIFY
-    }, {
-      // eslint-disable-next-line no-unused-vars
-      stringify: function stringify(it, replacer, space) {
-        var args = [it];
-        var index = 1;
-        var $replacer;
-
-        while (arguments.length > index) {
-          args.push(arguments[index++]);
-        }
-
-        $replacer = replacer;
-        if (!isObject(replacer) && it === undefined || isSymbol(it)) return; // IE8 returns string on undefined
-
-        if (!isArray(replacer)) replacer = function replacer(key, value) {
-          if (typeof $replacer == 'function') value = $replacer.call(this, key, value);
-          if (!isSymbol(value)) return value;
-        };
-        args[1] = replacer;
-        return $stringify.apply(null, args);
-      }
-    });
-  } // `Symbol.prototype[@@toPrimitive]` method
-  // https://tc39.es/ecma262/#sec-symbol.prototype-@@toprimitive
-
-
-  if (!$Symbol[PROTOTYPE$1][TO_PRIMITIVE]) {
-    createNonEnumerableProperty($Symbol[PROTOTYPE$1], TO_PRIMITIVE, $Symbol[PROTOTYPE$1].valueOf);
-  } // `Symbol.prototype[@@toStringTag]` property
-  // https://tc39.es/ecma262/#sec-symbol.prototype-@@tostringtag
-
-
-  setToStringTag($Symbol, SYMBOL);
-  hiddenKeys[HIDDEN] = true;
-
-  var defineProperty$6 = objectDefineProperty.f;
-  var NativeSymbol = global$1.Symbol;
-
-  if (descriptors && typeof NativeSymbol == 'function' && (!('description' in NativeSymbol.prototype) || // Safari 12 bug
-  NativeSymbol().description !== undefined)) {
-    var EmptyStringDescriptionStore = {}; // wrap Symbol constructor for correct work with undefined description
-
-    var SymbolWrapper = function _Symbol() {
-      var description = arguments.length < 1 || arguments[0] === undefined ? undefined : String(arguments[0]);
-      var result = this instanceof SymbolWrapper ? new NativeSymbol(description) // in Edge 13, String(Symbol(undefined)) === 'Symbol(undefined)'
-      : description === undefined ? NativeSymbol() : NativeSymbol(description);
-      if (description === '') EmptyStringDescriptionStore[result] = true;
-      return result;
-    };
-
-    copyConstructorProperties(SymbolWrapper, NativeSymbol);
-    var symbolPrototype = SymbolWrapper.prototype = NativeSymbol.prototype;
-    symbolPrototype.constructor = SymbolWrapper;
-    var symbolToString = symbolPrototype.toString;
-    var native = String(NativeSymbol('test')) == 'Symbol(test)';
-    var regexp = /^Symbol\((.*)\)[^)]+$/;
-    defineProperty$6(symbolPrototype, 'description', {
-      configurable: true,
-      get: function description() {
-        var symbol = isObject(this) ? this.valueOf() : this;
-        var string = symbolToString.call(symbol);
-        if (has(EmptyStringDescriptionStore, symbol)) return '';
-        var desc = native ? string.slice(7, -1) : string.replace(regexp, '$1');
-        return desc === '' ? undefined : desc;
-      }
-    });
-    _export({
-      global: true,
-      forced: true
-    }, {
-      Symbol: SymbolWrapper
-    });
-  }
-
-  // https://tc39.es/ecma262/#sec-symbol.tostringtag
-
-  defineWellKnownSymbol('toStringTag');
-
-  // https://tc39.es/ecma262/#sec-json-@@tostringtag
-
-  setToStringTag(global$1.JSON, 'JSON', true);
-
-  // https://tc39.es/ecma262/#sec-math-@@tostringtag
-
-  setToStringTag(Math, 'Math', true);
-
-  var DeferredPromise = // https://stackoverflow.com/a/47112177
-  function DeferredPromise() {
-    var _this = this;
-
-    _classCallCheck(this, DeferredPromise);
-
-    this.resolved = false;
-    this._promise = new Promise(function (resolve, reject) {
-      // assign the resolve and reject functions to `this`
-      // making them usable on the class instance
-      _this.resolve = function () {
-        _this.resolved = true;
-        return resolve();
-      };
-
-      _this.reject = reject;
-    }); // bind `then` and `catch` to implement the same interface as Promise
-
-    this.then = this._promise.then.bind(this._promise);
-    this.catch = this._promise.catch.bind(this._promise);
-    this[Symbol.toStringTag] = 'Promise';
-  };
-
-  /**
-   * Class for storing a single chunk
-   * @name FlowChunk
-   * @param {Flow} flowObj
-   * @param {FlowFile} fileObj
-   * @param {number} offset
-   * @constructor
-   */
-
-  var FlowChunk = /*#__PURE__*/function () {
-    function FlowChunk(flowObj, fileObj, offset) {
-      _classCallCheck(this, FlowChunk);
-
-      /**
-       * Reference to parent flow object
-       * @type {Flow}
-       */
-      this.flowObj = flowObj;
-      /**
-       * Reference to parent FlowFile object
-       * @type {FlowFile}
-       */
-
-      this.fileObj = fileObj;
-      /**
-       * File offset
-       * @type {number}
-       */
-
-      this.offset = offset;
-      /**
-       * Indicates if chunk existence was checked on the server
-       * @type {boolean}
-       */
-
-      this.tested = false;
-      /**
-       * Number of retries performed
-       * @type {number}
-       */
-
-      this.retries = 0;
-      /**
-       * Pending retry
-       * @type {boolean}
-       */
-
-      this.pendingRetry = false;
-      /**
-       * Preprocess state
-       * @type {number} 0 = unprocessed, 1 = processing, 2 = finished
-       */
-
-      this.preprocessState = 0;
-      /**
-       * Read state
-       * @type {number} 0 = not read, 1 = reading, 2 = finished
-       */
-
-      this.readState = 0;
-      /**
-       * The payload.
-       * @type {Blob|string}
-       */
-
-      this.payload = null;
-      /**
-       * Mostly for streams: how many bytes were actually read
-       * @type {number} -1 = not read
-       */
-
-      this.readBytes = -1;
-      /**
-       * File-level read state.
-       * When reading from a stream we can't slice a known-size buffer in chunks.
-       * These are constructed sequentially from blocking read. This list stores the
-       * respective Promise status of each chunk.
-       * @type {Promise}
-       */
-
-      this.readStreamState = new DeferredPromise();
-      /**
-       * Bytes transferred from total request size
-       * @type {number}
-       */
-
-      this.loaded = 0;
-      /**
-       * Total request size
-       * @type {number}
-       */
-
-      this.total = 0;
-      /**
-       * Size of a chunk
-       * @type {number}
-       */
-
-      this.chunkSize = this.fileObj.chunkSize;
-      /**
-       * Chunk start byte in a file
-       * @type {number}
-       */
-
-      this.startByte = this.offset * this.chunkSize;
-      /**
-       * A specific filename for this chunk which otherwise default to the main name
-       * @type {string}
-       */
-
-      this.filename = null;
-      /**
-       * Chunk end byte in a file
-       * @type {number}
-       */
-
-      this.endByte = this.computeEndByte();
-      /**
-       * XMLHttpRequest
-       * @type {XMLHttpRequest}
-       */
-
-      this.xhr = null;
-    }
-    /**
-     * Compute the endbyte in a file
-     *
-     */
-
-
-    _createClass(FlowChunk, [{
-      key: "computeEndByte",
-      value: function computeEndByte() {
-        var endByte = Math.min(this.fileObj.size, (this.offset + 1) * this.chunkSize);
-
-        if (this.fileObj.size - endByte < this.chunkSize && !this.flowObj.opts.forceChunkSize) {
-          // The last chunk will be bigger than the chunk size,
-          // but less than 2 * this.chunkSize
-          endByte = this.fileObj.size;
-        }
-
-        return endByte;
-      }
-      /**
-       * Send chunk event
-       * @param event
-       * @param {...} args arguments of a callback
-       */
-
-    }, {
-      key: "event",
-      value: function event(_event, args) {
-        args = Array.prototype.slice.call(arguments);
-        args.unshift(this);
-        this.fileObj.chunkEvent.apply(this.fileObj, args);
-      }
-      /**
-       * Catch progress event
-       * @param {ProgressEvent} event
-       */
-
-    }, {
-      key: "progressHandler",
-      value: function progressHandler(event) {
-        // console.log(event);
-        if (event.lengthComputable) {
-          this.loaded = event.loaded;
-          this.total = event.total;
-        }
-
-        this.event('progress', event);
-      }
-      /**
-       * Catch test event
-       * @param {Event} event
-       */
-
-    }, {
-      key: "testHandler",
-      value: function testHandler(event) {
-        var status = this.status(true);
-
-        if (status === 'error') {
-          this.event(status, this.message());
-          this.flowObj.uploadNextChunk();
-        } else if (status === 'success') {
-          this.tested = true;
-          this.event(status, this.message());
-          this.flowObj.uploadNextChunk();
-        } else if (!this.fileObj.paused) {
-          // Error might be caused by file pause method
-          // Chunks does not exist on the server side
-          this.tested = true;
-          this.send();
-        }
-      }
-      /**
-       * Upload has stopped
-       * @param {Event} event
-       */
-
-    }, {
-      key: "doneHandler",
-      value: function doneHandler(event) {
-        var _this = this;
-
-        var status = this.status();
-
-        if (status === 'success' || status === 'error') {
-          delete this.data;
-          this.event(status, this.message());
-          this.flowObj.uploadNextChunk();
-        } else if (!this.fileObj.paused) {
-          this.event('retry', this.message());
-          this.pendingRetry = true;
-          this.abort();
-          this.retries++;
-          var retryInterval = this.flowObj.opts.chunkRetryInterval;
-
-          if (retryInterval !== null) {
-            setTimeout(function () {
-              return _this.send();
-            }, retryInterval);
-          } else {
-            this.send();
-          }
-        }
-      }
-      /**
-       * Get params for a request
-       * @function
-       */
-
-    }, {
-      key: "getParams",
-      value: function getParams() {
-        return {
-          flowChunkNumber: this.offset + 1,
-          flowChunkSize: this.chunkSize,
-          flowCurrentChunkSize: this.endByte - this.startByte,
-          flowTotalSize: this.fileObj.size,
-          flowIdentifier: this.fileObj.uniqueIdentifier,
-          flowFilename: this.fileObj.name,
-          flowRelativePath: this.fileObj.relativePath,
-          flowTotalChunks: this.fileObj.chunks.length
-        };
-      }
-      /**
-       * Get target option with query params
-       * @function
-       * @param params
-       * @returns {string}
-       */
-
-    }, {
-      key: "getTarget",
-      value: function getTarget(target, params) {
-        if (params.length == 0) {
-          return target;
-        }
-
-        if (target.indexOf('?') < 0) {
-          target += '?';
-        } else {
-          target += '&';
-        }
-
-        return target + params.join('&');
-      }
-      /**
-       * Makes a GET request without any data to see if the chunk has already
-       * been uploaded in a previous session
-       * @function
-       */
-
-    }, {
-      key: "test",
-      value: function test() {
-        // Set up request and listen for event
-        this.xhr = new XMLHttpRequest();
-        this.xhr.addEventListener("load", this.testHandler.bind(this), false);
-        this.xhr.addEventListener("error", this.testHandler.bind(this), false);
-        var testMethod = evalOpts(this.flowObj.opts.testMethod, this.fileObj, this);
-        var data = this.prepareXhrRequest(testMethod, true);
-        this.xhr.send(data);
-      }
-      /**
-       * Finish preprocess state
-       * @function
-       */
-
-    }, {
-      key: "preprocessFinished",
-      value: function () {
-        var _preprocessFinished = _asyncToGenerator( /*#__PURE__*/regeneratorRuntime.mark(function _callee() {
-          return regeneratorRuntime.wrap(function _callee$(_context) {
-            while (1) {
-              switch (_context.prev = _context.next) {
-                case 0:
-                  // Re-compute the endByte after the preprocess function to allow an
-                  // implementer of preprocess to set the fileObj size
-                  this.endByte = this.computeEndByte();
-                  this.preprocessState = 2;
-                  _context.next = 4;
-                  return this.send();
-
-                case 4:
-                case "end":
-                  return _context.stop();
-              }
-            }
-          }, _callee, this);
-        }));
-
-        function preprocessFinished() {
-          return _preprocessFinished.apply(this, arguments);
-        }
-
-        return preprocessFinished;
-      }()
-      /**
-       * Finish read state
-       * @function
-       */
-
-    }, {
-      key: "readFinished",
-      value: function readFinished(payload) {
-        this.readState = 2;
-        this.payload = payload;
-        this.send();
-      }
-      /**
-       * asyncReadFileFn() helper provides the ability of asynchronous read()
-       * Eg: When reading from a ReadableStream.getReader().
-       *
-       * But:
-       * - FlowChunk.send() can be called up to {simultaneousUploads} times.
-       * - Concurrent or misordered read() would result in a corrupted payload.
-       *
-       * This function guards from this: As soon a previous chunk exists and as long as
-       *  this previous chunk is not fully read(), we assume corresponding reader is unavailable
-       *  and wait for it.
-       * @function
-       */
-
-    }, {
-      key: "readStreamGuard",
-      value: function () {
-        var _readStreamGuard = _asyncToGenerator( /*#__PURE__*/regeneratorRuntime.mark(function _callee2() {
-          var map;
-          return regeneratorRuntime.wrap(function _callee2$(_context2) {
-            while (1) {
-              switch (_context2.prev = _context2.next) {
-                case 0:
-                  map = this.fileObj.chunks.map(function (e) {
-                    return e.readStreamState;
-                  }).slice(0, this.offset);
-                  _context2.prev = 1;
-                  _context2.next = 4;
-                  return Promise.all(map);
-
-                case 4:
-                  _context2.next = 10;
-                  break;
-
-                case 6:
-                  _context2.prev = 6;
-                  _context2.t0 = _context2["catch"](1);
-                  console.error("Chunk ".concat(this.offset, ": Error while waiting for ").concat(map.length, " previous chunks being read."));
-                  throw _context2.t0;
-
-                case 10:
-                case "end":
-                  return _context2.stop();
-              }
-            }
-          }, _callee2, this, [[1, 6]]);
-        }));
-
-        function readStreamGuard() {
-          return _readStreamGuard.apply(this, arguments);
-        }
-
-        return readStreamGuard;
-      }()
-    }, {
-      key: "readStreamChunk",
-      value: function () {
-        var _readStreamChunk = _asyncToGenerator( /*#__PURE__*/regeneratorRuntime.mark(function _callee3() {
-          var data, asyncRead;
-          return regeneratorRuntime.wrap(function _callee3$(_context3) {
-            while (1) {
-              switch (_context3.prev = _context3.next) {
-                case 0:
-                  if (!this.readStreamState.resolved) {
-                    _context3.next = 6;
-                    break;
-                  }
-
-                  if (!(this.payload && this.pendingRetry)) {
-                    _context3.next = 4;
-                    break;
-                  }
-
-                  console.info("Retrying chunk ".concat(this.offset, " upload"));
-                  return _context3.abrupt("return", this.uploadStreamChunk(this.payload));
-
-                case 4:
-                  console.warn("Chunk ".concat(this.offset, " already read. xhr initialized = ").concat(this.xhr ? 1 : 0, ". payload size = ").concat(this.payload ? this.payload.size : null, ". readState = ").concat(this.readState, ". retry = ").concat(this.pendingRetry)); // ... but never try to read that same chunk from the (non-rewindable) stream again or we'd risk
-                  // not only misordered chunks but a corrupted file.
-
-                  return _context3.abrupt("return", null);
-
-                case 6:
-                  this.readState = 1;
-                  _context3.next = 9;
-                  return this.readStreamGuard();
-
-                case 9:
-                  asyncRead = this.flowObj.opts.asyncReadFileFn;
-                  _context3.next = 12;
-                  return asyncRead(this.fileObj, this.startByte, this.endByte, this.fileObj.file.type, this);
-
-                case 12:
-                  data = _context3.sent;
-                  this.readStreamState.resolve(); // Equivalent to readFinished()
-
-                  this.readState = 2;
-
-                  if (data) {
-                    this.readBytes = data.size || data.size === 0 ? data.size : -1;
-                  }
-
-                  return _context3.abrupt("return", this.uploadStreamChunk(data));
-
-                case 17:
-                case "end":
-                  return _context3.stop();
-              }
-            }
-          }, _callee3, this);
-        }));
-
-        function readStreamChunk() {
-          return _readStreamChunk.apply(this, arguments);
-        }
-
-        return readStreamChunk;
-      }()
-    }, {
-      key: "uploadStreamChunk",
-      value: function () {
-        var _uploadStreamChunk = _asyncToGenerator( /*#__PURE__*/regeneratorRuntime.mark(function _callee4(data) {
-          var lastReadBytes;
-          return regeneratorRuntime.wrap(function _callee4$(_context4) {
-            while (1) {
-              switch (_context4.prev = _context4.next) {
-                case 0:
-                  if (!(data && data.size > 0)) {
-                    _context4.next = 5;
-                    break;
-                  }
-
-                  if (this.fileObj.chunkSize && data.size > this.fileObj.chunkSize) {
-                    // This may imply a miscalculation of the total chunk numbers.
-                    console.warn("Chunk ".concat(this.offset, ": returned too much data. Got ").concat(data.size, ". Expected not more than ").concat(this.flowObj.chunkSize, "."));
-                  }
-
-                  this.payload = data;
-                  this.xhrSend(data);
-                  return _context4.abrupt("return");
-
-                case 5:
-                  if (!(this.offset > 0)) {
-                    _context4.next = 13;
-                    break;
-                  }
-
-                  // last size of the buffer read for the previous chunk
-                  lastReadBytes = this.fileObj.chunks[this.offset - 1].readBytes;
-
-                  if (!(lastReadBytes < parseInt(this.chunkSize))) {
-                    _context4.next = 13;
-                    break;
-                  }
-
-                  console.warn("Chunk ".concat(this.offset, " seems superfluous. No byte read() meanwhile previous chunk was only ").concat(lastReadBytes, " bytes instead of ").concat(this.chunkSize)); // The last chunk's buffer wasn't even full. That means the number of chunk may
-                  // have been miscomputed and this chunk is superfluous.
-                  // We make a fake request so that overall status is "complete" and we can move on
-                  // on this FlowFile.
-
-                  this.pendingRetry = false;
-                  this.xhr = {
-                    readyState: 4,
-                    status: 200,
-                    abort: function abort(e) {
-                      return null;
-                    }
-                  };
-                  this.doneHandler(null);
-                  return _context4.abrupt("return");
-
-                case 13:
-                  console.warn("Chunk ".concat(this.offset, ": no byte to read()"));
-                  this.pendingRetry = false;
-
-                case 15:
-                case "end":
-                  return _context4.stop();
-              }
-            }
-          }, _callee4, this);
-        }));
-
-        function uploadStreamChunk(_x) {
-          return _uploadStreamChunk.apply(this, arguments);
-        }
-
-        return uploadStreamChunk;
-      }()
-      /**
-       * Prepare data (preprocess/read) data then call xhrSend()
-       * @function
-       */
-
-    }, {
-      key: "send",
-      value: function () {
-        var _send = _asyncToGenerator( /*#__PURE__*/regeneratorRuntime.mark(function _callee5() {
-          var preprocess, read, asyncRead;
-          return regeneratorRuntime.wrap(function _callee5$(_context5) {
-            while (1) {
-              switch (_context5.prev = _context5.next) {
-                case 0:
-                  preprocess = this.flowObj.opts.preprocess;
-                  read = this.flowObj.opts.readFileFn;
-                  asyncRead = this.flowObj.opts.asyncReadFileFn;
-
-                  if (!(typeof preprocess === 'function')) {
-                    _context5.next = 11;
-                    break;
-                  }
-
-                  _context5.t0 = this.preprocessState;
-                  _context5.next = _context5.t0 === 0 ? 7 : _context5.t0 === 1 ? 10 : 11;
-                  break;
-
-                case 7:
-                  this.preprocessState = 1;
-                  preprocess(this);
-                  return _context5.abrupt("return");
-
-                case 10:
-                  return _context5.abrupt("return");
-
-                case 11:
-                  if (!asyncRead) {
-                    _context5.next = 15;
-                    break;
-                  }
-
-                  _context5.next = 14;
-                  return this.readStreamChunk();
-
-                case 14:
-                  return _context5.abrupt("return");
-
-                case 15:
-                  _context5.t1 = this.readState;
-                  _context5.next = _context5.t1 === 0 ? 18 : _context5.t1 === 1 ? 21 : 22;
-                  break;
-
-                case 18:
-                  this.readState = 1;
-                  read(this.fileObj, this.startByte, this.endByte, this.fileObj.file.type, this);
-                  return _context5.abrupt("return");
-
-                case 21:
-                  return _context5.abrupt("return");
-
-                case 22:
-                  this.xhrSend(this.payload);
-
-                case 23:
-                case "end":
-                  return _context5.stop();
-              }
-            }
-          }, _callee5, this);
-        }));
-
-        function send() {
-          return _send.apply(this, arguments);
-        }
-
-        return send;
-      }()
-      /**
-       * Actually uploads data in a POST call
-       * @function
-       */
-
-    }, {
-      key: "xhrSend",
-      value: function xhrSend(payload) {
-        if (this.flowObj.opts.testChunks && !this.tested) {
-          this.test();
-          return;
-        }
-
-        this.loaded = 0;
-        this.total = 0;
-        this.pendingRetry = false; // Set up request and listen for event
-
-        this.xhr = new XMLHttpRequest();
-        this.xhr.upload.addEventListener('progress', this.progressHandler.bind(this), false);
-        this.xhr.addEventListener('load', this.doneHandler.bind(this), false);
-        this.xhr.addEventListener('error', this.doneHandler.bind(this), false);
-        var uploadMethod = evalOpts(this.flowObj.opts.uploadMethod, this.fileObj, this);
-        var xhrPayload = this.prepareXhrRequest(uploadMethod, false, this.flowObj.opts.method, payload);
-        var changeRawDataBeforeSend = this.flowObj.opts.changeRawDataBeforeSend;
-
-        if (typeof changeRawDataBeforeSend === 'function') {
-          xhrPayload = changeRawDataBeforeSend(this, xhrPayload);
-        }
-
-        this.xhr.send(xhrPayload);
-      }
-      /**
-       * Abort current xhr request
-       * @function
-       */
-
-    }, {
-      key: "abort",
-      value: function abort() {
-        if (this.xhr) {
-          this.xhr.abort();
-        }
-
-        this.xhr = null;
-      }
-      /**
-       * Retrieve current chunk upload status
-       * @function
-       * @returns {string} 'pending', 'uploading', 'success', 'error'
-       */
-
-    }, {
-      key: "status",
-      value: function status(isTest) {
-        if (this.readState === 1) {
-          return 'reading';
-        } else if (this.preprocessState === 1) {
-          // if pending retry then that's effectively the same as actively uploading,
-          // there might just be a slight delay before the retry starts
-          return 'uploading';
-        } else if (!this.xhr || this.pendingRetry) {
-          return 'pending';
-        } else if (this.xhr.readyState < 4) {
-          // Status is really 'OPENED', 'HEADERS_RECEIVED'
-          // or 'LOADING' - meaning that stuff is happening
-          return 'uploading';
-        } else {
-          if (this.flowObj.opts.successStatuses.indexOf(this.xhr.status) > -1) {
-            // HTTP 200, perfect
-            // HTTP 202 Accepted - The request has been accepted for processing, but the processing has not been completed.
-            return 'success';
-          } else if (this.flowObj.opts.permanentErrors.indexOf(this.xhr.status) > -1 || !isTest && this.retries >= this.flowObj.opts.maxChunkRetries) {
-            // HTTP 413/415/500/501, permanent error
-            return 'error';
-          } else {
-            // this should never happen, but we'll reset and queue a retry
-            // a likely case for this would be 503 service unavailable
-            this.abort();
-            return 'pending';
-          }
-        }
-      }
-      /**
-       * Get response from xhr request
-       * @function
-       * @returns {String}
-       */
-
-    }, {
-      key: "message",
-      value: function message() {
-        return this.xhr ? this.xhr.responseText : '';
-      }
-      /**
-       * Get upload progress
-       * @function
-       * @returns {number}
-       */
-
-    }, {
-      key: "progress",
-      value: function progress() {
-        if (this.pendingRetry) {
-          return 0;
-        }
-
-        var s = this.status();
-
-        if (s === 'success' || s === 'error') {
-          return 1;
-        } else if (s === 'pending') {
-          return 0;
-        } else {
-          return this.total > 0 ? this.loaded / this.total : 0;
-        }
-      }
-      /**
-       * Count total size uploaded
-       * @function
-       * @returns {number}
-       */
-
-    }, {
-      key: "sizeUploaded",
-      value: function sizeUploaded() {
-        var size = this.endByte - this.startByte; // can't return only chunk.loaded value, because it is bigger than chunk size
-
-        if (this.status() !== 'success') {
-          size = this.progress() * size;
-        }
-
-        return size;
-      }
-      /**
-       * Prepare Xhr request. Set query, headers and data
-       * @param {string} method GET or POST
-       * @param {bool} isTest is this a test request
-       * @param {string} [paramsMethod] octet or form
-       * @param {Blob} [blob] to send
-       * @returns {FormData|Blob|Null} data to send
-       */
-
-    }, {
-      key: "prepareXhrRequest",
-      value: function prepareXhrRequest(method, isTest, paramsMethod, blob) {
-        // Add data from the query options
-        var query = evalOpts(this.flowObj.opts.query, this.fileObj, this, isTest);
-        query = Object.assign({}, query || {}, this.getParams());
-        var target = evalOpts(this.flowObj.opts.target, this.fileObj, this, isTest);
-        var data = null;
-
-        if (method === 'GET' || paramsMethod === 'octet') {
-          // Add data from the query options
-          var params = [];
-          each(query, function (v, k) {
-            params.push([encodeURIComponent(k), encodeURIComponent(v)].join('='));
-          });
-          target = this.getTarget(target, params);
-          data = blob || null;
-        } else {
-          // Add data from the query options
-          data = new FormData();
-          each(query, function (v, k) {
-            data.append(k, v);
-          });
-
-          if (typeof blob !== "undefined") {
-            data.append(this.flowObj.opts.fileParameterName, blob, this.filename || this.fileObj.file.name);
-          }
-        }
-
-        this.xhr.open(method, target, true);
-        this.xhr.withCredentials = this.flowObj.opts.withCredentials; // Add data from header options
-
-        each(evalOpts(this.flowObj.opts.headers, this.fileObj, this, isTest), function (v, k) {
-          this.xhr.setRequestHeader(k, v);
-        }, this);
-        return data;
-      }
-    }]);
-
-    return FlowChunk;
-  }();
+  }
 
   /**
    * FlowFile class
@@ -6292,553 +1002,419 @@
    * @param {string} uniqueIdentifier
    * @constructor
    */
+  class FlowFile {
 
-  var FlowFile = /*#__PURE__*/function () {
-    function FlowFile(flowObj, file, uniqueIdentifier) {
-      _classCallCheck(this, FlowFile);
+    constructor(flowObj, file, uniqueIdentifier) {
 
       /**
        * Reference to parent Flow instance
        * @type {Flow}
        */
       this.flowObj = flowObj;
+
       /**
        * Reference to file
        * @type {File}
        */
-
       this.file = file;
+
       /**
        * File name. Some confusion in different versions of Firefox
        * @type {string}
        */
-
       this.name = file.fileName || file.name;
+
       /**
        * File size
        * @type {number}
        */
-
       this.size = file.size;
+
       /**
        * Relative file path
        * @type {string}
        */
-
       this.relativePath = file.relativePath || file.webkitRelativePath || this.name;
+
       /**
        * File unique identifier
        * @type {string}
        */
+      this.uniqueIdentifier = (uniqueIdentifier === undefined ? flowObj.generateUniqueIdentifier(file) : uniqueIdentifier);
 
-      this.uniqueIdentifier = uniqueIdentifier === undefined ? flowObj.generateUniqueIdentifier(file) : uniqueIdentifier;
       /**
        * Size of Each Chunk
        * @type {number}
        */
-
       this.chunkSize = 0;
+
       /**
        * List of chunks
        * @type {Array.<FlowChunk>}
        */
-
       this.chunks = [];
+
       /**
        * Indicated if file is paused
        * @type {boolean}
        */
-
       this.paused = false;
+
       /**
        * Indicated if file has encountered an error
        * @type {boolean}
        */
-
       this.error = false;
+
       /**
        * Average upload speed
        * @type {number}
        */
-
       this.averageSpeed = 0;
+
       /**
        * Current upload speed
        * @type {number}
        */
-
       this.currentSpeed = 0;
+
       /**
        * Date then progress was called last time
        * @type {number}
        * @private
        */
-
       this._lastProgressCallback = Date.now();
+
       /**
        * Previously uploaded file size
        * @type {number}
        * @private
        */
-
       this._prevUploadedSize = 0;
+
       /**
        * Holds previous progress
        * @type {number}
        * @private
        */
-
       this._prevProgress = 0;
     }
+
     /**
      * Update speed parameters
      * @link http://stackoverflow.com/questions/2779600/how-to-estimate-download-time-remaining-accurately
      * @function
      */
-
-
-    _createClass(FlowFile, [{
-      key: "measureSpeed",
-      value: function measureSpeed() {
-        var timeSpan = Date.now() - this._lastProgressCallback;
-
-        if (!timeSpan) {
-          return;
-        }
-
-        var smoothingFactor = this.flowObj.opts.speedSmoothingFactor;
-        var uploaded = this.sizeUploaded(); // Prevent negative upload speed after file upload resume
-
-        this.currentSpeed = Math.max((uploaded - this._prevUploadedSize) / timeSpan * 1000, 0);
-        this.averageSpeed = smoothingFactor * this.currentSpeed + (1 - smoothingFactor) * this.averageSpeed;
-        this._prevUploadedSize = uploaded;
+    measureSpeed() {
+      var timeSpan = Date.now() - this._lastProgressCallback;
+      if (!timeSpan) {
+        return ;
       }
-      /**
-       * For internal usage only.
-       * Callback when something happens within the chunk.
-       * @function
-       * @param {FlowChunk} chunk
-       * @param {string} event can be 'progress', 'success', 'error' or 'retry'
-       * @param {string} [message]
-       */
-
-    }, {
-      key: "chunkEvent",
-      value: function chunkEvent(chunk, event, message) {
-        switch (event) {
-          case 'progress':
-            if (Date.now() - this._lastProgressCallback < this.flowObj.opts.progressCallbacksInterval) {
-              break;
-            }
-
-            this.measureSpeed();
-            this.flowObj.emit('file-progress', this, chunk);
-            this.flowObj.emit('progress');
-            this._lastProgressCallback = Date.now();
-            break;
-
-          case 'error':
-            this.error = true;
-            this.abort(true);
-            this.flowObj.emit('file-error', this, message, chunk);
-            this.flowObj.emit('error', message, this, chunk);
-            break;
-
-          case 'success':
-            if (this.error) {
-              return;
-            }
-
-            this.measureSpeed();
-            this.flowObj.emit('file-progress', this, chunk);
-            this.flowObj.emit('progress');
-            this._lastProgressCallback = Date.now();
-
-            if (this.isComplete()) {
-              this.currentSpeed = 0;
-              this.averageSpeed = 0;
-              this.flowObj.emit('file-success', this, message, chunk);
-            }
-
-            break;
+      var smoothingFactor = this.flowObj.opts.speedSmoothingFactor;
+      var uploaded = this.sizeUploaded();
+      // Prevent negative upload speed after file upload resume
+      this.currentSpeed = Math.max((uploaded - this._prevUploadedSize) / timeSpan * 1000, 0);
+      this.averageSpeed = smoothingFactor * this.currentSpeed + (1 - smoothingFactor) * this.averageSpeed;
+      this._prevUploadedSize = uploaded;
+    }
 
-          case 'retry':
-            this.flowObj.emit('file-retry', this, chunk);
+    /**
+     * For internal usage only.
+     * Callback when something happens within the chunk.
+     * @function
+     * @param {FlowChunk} chunk
+     * @param {string} event can be 'progress', 'success', 'error' or 'retry'
+     * @param {string} [message]
+     */
+    chunkEvent(chunk, event, message) {
+      switch (event) {
+        case 'progress':
+          if (Date.now() - this._lastProgressCallback <
+              this.flowObj.opts.progressCallbacksInterval) {
             break;
-        }
-      }
-      /**
-       * Pause file upload
-       * @function
-       */
-
-    }, {
-      key: "pause",
-      value: function pause() {
-        this.paused = true;
-        this.abort();
-      }
-      /**
-       * Resume file upload
-       * @function
-       */
-
-    }, {
-      key: "resume",
-      value: function resume() {
-        this.paused = false;
-        this.flowObj.upload();
-      }
-      /**
-       * Abort current upload
-       * @function
-       */
-
-    }, {
-      key: "abort",
-      value: function abort(reset) {
-        this.currentSpeed = 0;
-        this.averageSpeed = 0;
-
-        if (reset) {
-          this.chunks = [];
-        }
-
-        var _iterator = _createForOfIteratorHelper(this.chunks),
-            _step;
-
-        try {
-          for (_iterator.s(); !(_step = _iterator.n()).done;) {
-            var c = _step.value;
-
-            if (c.status() === 'uploading') {
-              c.abort();
-              c.pendingRetry = true;
-              this.flowObj.uploadNextChunk();
-            }
           }
-        } catch (err) {
-          _iterator.e(err);
-        } finally {
-          _iterator.f();
-        }
-      }
-      /**
-       * Cancel current upload and remove from a list
-       * @function
-       */
-
-    }, {
-      key: "cancel",
-      value: function cancel() {
-        this.flowObj.removeFile(this);
-      }
-      /**
-       * Retry aborted file upload
-       * @function
-       */
-
-    }, {
-      key: "retry",
-      value: function retry() {
-        this.bootstrap('retry');
-        this.flowObj.upload();
+          this.measureSpeed();
+          this.flowObj.emit('file-progress', this, chunk);
+          this.flowObj.emit('progress');
+          this._lastProgressCallback = Date.now();
+          break;
+        case 'error':
+          this.error = true;
+          this.abort(true);
+          this.flowObj.emit('file-error', this, message, chunk);
+          this.flowObj.emit('error', message, this, chunk);
+          break;
+        case 'success':
+          if (this.error) {
+            return;
+          }
+          this.measureSpeed();
+          this.flowObj.emit('file-progress', this, chunk);
+          this.flowObj.emit('progress');
+          this._lastProgressCallback = Date.now();
+          if (this.isComplete()) {
+            this.currentSpeed = 0;
+            this.averageSpeed = 0;
+            this.flowObj.emit('file-success', this, message, chunk);
+          }
+          break;
+        case 'retry':
+          this.flowObj.emit('file-retry', this, chunk);
+          break;
       }
-      /**
-       * Clear current chunks and slice file again
-       * @function
-       */
+    }
 
-    }, {
-      key: "bootstrap",
-      value: function bootstrap() {
-        var initFileFn = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : this.flowObj.opts.initFileFn;
+    /**
+     * Pause file upload
+     * @function
+     */
+    pause() {
+      this.paused = true;
+      this.abort();
+    }
 
-        if (typeof initFileFn === "function") {
-          initFileFn(this);
-        }
+    /**
+     * Resume file upload
+     * @function
+     */
+    resume() {
+      this.paused = false;
+      this.flowObj.upload();
+    }
 
-        this._bootstrap();
+    /**
+     * Abort current upload
+     * @function
+     */
+    abort(reset) {
+      this.currentSpeed = 0;
+      this.averageSpeed = 0;
+      if (reset) {
+        this.chunks = [];
       }
-    }, {
-      key: "_bootstrap",
-      value: function _bootstrap() {
-        this.abort(true);
-        this.error = false; // Rebuild stack of chunks from file
-
-        this._prevProgress = 0;
-        var round = this.flowObj.opts.forceChunkSize ? Math.ceil : Math.floor;
-        this.chunkSize = evalOpts(this.flowObj.opts.chunkSize, this);
-        var chunks = Math.max(round(this.size / this.chunkSize), 1);
-
-        for (var offset = 0; offset < chunks; offset++) {
-          this.chunks.push(new FlowChunk(this.flowObj, this, offset));
+      for (let c of this.chunks) {
+        if (c.status() === 'uploading') {
+          c.abort();
+          c.pendingRetry = true;
+          this.flowObj.uploadNextChunk();
         }
       }
-      /**
-       * Get current upload progress status
-       * @function
-       * @returns {number} from 0 to 1
-       */
-
-    }, {
-      key: "progress",
-      value: function progress() {
-        if (this.error) {
-          return 1;
-        }
-
-        if (this.chunks.length === 1) {
-          this._prevProgress = Math.max(this._prevProgress, this.chunks[0].progress());
-          return this._prevProgress;
-        } // Sum up progress across everything
-
+    }
 
-        var bytesLoaded = 0;
-        each(this.chunks, function (c) {
-          // get chunk progress relative to entire file
-          bytesLoaded += c.progress() * (c.endByte - c.startByte);
-        });
-        var percent = bytesLoaded / this.size; // We don't want to lose percentages when an upload is paused
+    /**
+     * Cancel current upload and remove from a list
+     * @function
+     */
+    cancel() {
+      this.flowObj.removeFile(this);
+    }
 
-        this._prevProgress = Math.max(this._prevProgress, percent > 0.9999 ? 1 : percent);
-        return this._prevProgress;
-      }
-      /**
-       * Indicates if file is being uploaded at the moment
-       * @function
-       * @returns {boolean}
-       */
+    /**
+     * Retry aborted file upload
+     * @function
+     */
+    retry() {
+      this.bootstrap('retry');
+      this.flowObj.upload();
+    }
 
-    }, {
-      key: "isUploading",
-      value: function isUploading() {
-        var uploading = false;
-        each(this.chunks, function (chunk) {
-          if (chunk.status() === 'uploading') {
-            uploading = true;
-            return false;
-          }
-        });
-        return uploading;
+    /**
+     * Clear current chunks and slice file again
+     * @function
+     */
+    bootstrap(event = null, initFileFn = this.flowObj.opts.initFileFn) {
+      if (typeof initFileFn === "function") {
+        initFileFn(this);
       }
-      /**
-       * Indicates if file is has finished uploading and received a response
-       * @function
-       * @returns {boolean}
-       */
 
-    }, {
-      key: "isComplete",
-      value: function isComplete() {
-        var outstanding = false;
-        each(this.chunks, function (chunk) {
-          var status = chunk.status();
+      this._bootstrap();
+    }
 
-          if (status === 'pending' || status === 'uploading' || status === 'reading' || chunk.preprocessState === 1 || chunk.readState === 1) {
-            outstanding = true;
-            return false;
-          }
-        });
-        return !outstanding;
+    _bootstrap() {
+      this.abort(true);
+      this.error = false;
+      // Rebuild stack of chunks from file
+      this._prevProgress = 0;
+      var round = this.flowObj.opts.forceChunkSize ? Math.ceil : Math.floor;
+      this.chunkSize = evalOpts(this.flowObj.opts.chunkSize, this);
+      var chunks = Math.max(
+        round(this.size / this.chunkSize), 1
+      );
+      for (var offset = 0; offset < chunks; offset++) {
+        this.chunks.push(
+          new FlowChunk(this.flowObj, this, offset)
+        );
       }
-      /**
-       * Count total size uploaded
-       * @function
-       * @returns {number}
-       */
+    }
 
-    }, {
-      key: "sizeUploaded",
-      value: function sizeUploaded() {
-        var size = 0;
-        each(this.chunks, function (chunk) {
-          size += chunk.sizeUploaded();
-        });
-        return size;
+    /**
+     * Get current upload progress status
+     * @function
+     * @returns {number} from 0 to 1
+     */
+    progress() {
+      if (this.error) {
+        return 1;
       }
-      /**
-       * Returns remaining time to finish upload file in seconds. Accuracy is based on average speed.
-       * If speed is zero, time remaining will be equal to positive infinity `Number.POSITIVE_INFINITY`
-       * @function
-       * @returns {number}
-       */
+      if (this.chunks.length === 1) {
+        this._prevProgress = Math.max(this._prevProgress, this.chunks[0].progress());
+        return this._prevProgress;
+      }
+      // Sum up progress across everything
+      var bytesLoaded = 0;
+      each(this.chunks, function (c) {
+        // get chunk progress relative to entire file
+        bytesLoaded += c.progress() * (c.endByte - c.startByte);
+      });
+      var percent = bytesLoaded / this.size;
+      // We don't want to lose percentages when an upload is paused
+      this._prevProgress = Math.max(this._prevProgress, percent > 0.9999 ? 1 : percent);
+      return this._prevProgress;
+    }
 
-    }, {
-      key: "timeRemaining",
-      value: function timeRemaining() {
-        if (this.paused || this.error) {
-          return 0;
+    /**
+     * Indicates if file is being uploaded at the moment
+     * @function
+     * @returns {boolean}
+     */
+    isUploading() {
+      var uploading = false;
+      each(this.chunks, function (chunk) {
+        if (chunk.status() === 'uploading') {
+          uploading = true;
+          return false;
         }
+      });
+      return uploading;
+    }
 
-        var delta = this.size - this.sizeUploaded();
-
-        if (delta && !this.averageSpeed) {
-          return Number.POSITIVE_INFINITY;
+    /**
+     * Indicates if file is has finished uploading and received a response
+     * @function
+     * @returns {boolean}
+     */
+    isComplete() {
+      var outstanding = false;
+      each(this.chunks, function (chunk) {
+        var status = chunk.status();
+        if (status === 'pending' || status === 'uploading' || status === 'reading' || chunk.preprocessState === 1 || chunk.readState === 1) {
+          outstanding = true;
+          return false;
         }
+      });
+      return !outstanding;
+    }
 
-        if (!delta && !this.averageSpeed) {
-          return 0;
-        }
+    /**
+     * Count total size uploaded
+     * @function
+     * @returns {number}
+     */
+    sizeUploaded() {
+      var size = 0;
+      each(this.chunks, function (chunk) {
+        size += chunk.sizeUploaded();
+      });
+      return size;
+    }
 
-        return Math.floor(delta / this.averageSpeed);
+    /**
+     * Returns remaining time to finish upload file in seconds. Accuracy is based on average speed.
+     * If speed is zero, time remaining will be equal to positive infinity `Number.POSITIVE_INFINITY`
+     * @function
+     * @returns {number}
+     */
+    timeRemaining() {
+      if (this.paused || this.error) {
+        return 0;
       }
-      /**
-       * Get file type
-       * @function
-       * @returns {string}
-       */
-
-    }, {
-      key: "getType",
-      value: function getType() {
-        return this.file.type && this.file.type.split('/')[1];
+      var delta = this.size - this.sizeUploaded();
+      if (delta && !this.averageSpeed) {
+        return Number.POSITIVE_INFINITY;
       }
-      /**
-       * Get file extension
-       * @function
-       * @returns {string}
-       */
-
-    }, {
-      key: "getExtension",
-      value: function getExtension() {
-        return this.name.substr((~-this.name.lastIndexOf(".") >>> 0) + 2).toLowerCase();
+      if (!delta && !this.averageSpeed) {
+        return 0;
       }
-    }]);
+      return Math.floor(delta / this.averageSpeed);
+    }
+
+    /**
+     * Get file type
+     * @function
+     * @returns {string}
+     */
+    getType() {
+      return this.file.type && this.file.type.split('/')[1];
+    }
+
+    /**
+     * Get file extension
+     * @function
+     * @returns {string}
+     */
+    getExtension() {
+      return this.name.substr((~-this.name.lastIndexOf(".") >>> 0) + 2).toLowerCase();
+    }
+  }
 
-    return FlowFile;
-  }();
-  var g$1 = typeof window !== 'undefined' ? window : typeof global !== 'undefined' ? global : typeof self !== 'undefined' ? self : {};
-  g$1.FlowFile = FlowFile;
+  /**
+   * Exclusively for test purposes
+   * (Until Grunt+Karma+Jasmine can allow test to use (ES) `import` of tools.js)
+   */
+  var g = typeof window !== 'undefined' ? window
+      : typeof global !== 'undefined' ? global
+      : typeof self !== 'undefined' ? self : {};
+  g.FlowFile = FlowFile;
 
   /**
    * AsyncFlowFile class
    * @name AsyncFlowFile
    */
+  class AsyncFlowFile extends FlowFile {
 
-  var AsyncFlowFile = /*#__PURE__*/function (_FlowFile) {
-    _inherits(AsyncFlowFile, _FlowFile);
-
-    var _super = _createSuper(AsyncFlowFile);
-
-    function AsyncFlowFile() {
-      _classCallCheck(this, AsyncFlowFile);
-
-      return _super.apply(this, arguments);
+    /**
+     * Retry aborted file upload
+     * @function
+     */
+    async retry() {
+      await this.bootstrap('retry');
+      return await this.flowObj.upload();
     }
 
-    _createClass(AsyncFlowFile, [{
-      key: "retry",
-
-      /**
-       * Retry aborted file upload
-       * @function
-       */
-      value: function () {
-        var _retry = _asyncToGenerator( /*#__PURE__*/regeneratorRuntime.mark(function _callee() {
-          return regeneratorRuntime.wrap(function _callee$(_context) {
-            while (1) {
-              switch (_context.prev = _context.next) {
-                case 0:
-                  _context.next = 2;
-                  return this.bootstrap('retry');
-
-                case 2:
-                  return _context.abrupt("return", this.flowObj.upload());
-
-                case 3:
-                case "end":
-                  return _context.stop();
-              }
-            }
-          }, _callee, this);
-        }));
-
-        function retry() {
-          return _retry.apply(this, arguments);
-        }
-
-        return retry;
-      }()
-    }, {
-      key: "bootstrap",
-      value: function () {
-        var _bootstrap = _asyncToGenerator( /*#__PURE__*/regeneratorRuntime.mark(function _callee2() {
-          var event,
-              initFileFn,
-              _args2 = arguments;
-          return regeneratorRuntime.wrap(function _callee2$(_context2) {
-            while (1) {
-              switch (_context2.prev = _context2.next) {
-                case 0:
-                  event = _args2.length > 0 && _args2[0] !== undefined ? _args2[0] : null;
-                  initFileFn = _args2.length > 1 && _args2[1] !== undefined ? _args2[1] : this.flowObj.opts.initFileFn;
-
-                  if (!(typeof initFileFn === 'function')) {
-                    _context2.next = 5;
-                    break;
-                  }
-
-                  _context2.next = 5;
-                  return initFileFn(this, event);
-
-                case 5:
-                  this._bootstrap();
-
-                  if (event !== 'retry') {
-                    this.flowObj.hook('file-added', this, event);
-                  } // console.log("Flowfile returns [async]", this._bootstrapped);
-
-
-                  return _context2.abrupt("return", this);
-
-                case 8:
-                case "end":
-                  return _context2.stop();
-              }
-            }
-          }, _callee2, this);
-        }));
-
-        function bootstrap() {
-          return _bootstrap.apply(this, arguments);
-        }
-
-        return bootstrap;
-      }()
+    async bootstrap(event = null, initFileFn = this.flowObj.opts.initFileFn) {
       /**
-       * Indicates if string is being read at the moment
-       * @function
-       * @returns {boolean}
+       * Asynchronous initialization function, if defined, is run
+       * Then _bootstrap follow-up occurs
+       * And, optionally (in case of initial FlowFile creation), the `file-added` event is fired.
        */
+      if (typeof initFileFn === 'function') {
+        await initFileFn(this, event);
+      }
 
-    }, {
-      key: "isReading",
-      value: function isReading() {
-        var _iterator = _createForOfIteratorHelper(this.chunks),
-            _step;
+      this._bootstrap();
 
-        try {
-          for (_iterator.s(); !(_step = _iterator.n()).done;) {
-            var chunk = _step.value;
+      // console.log("Flowfile returns [async]", this._bootstrapped);
+      return this;
+    }
 
-            if (chunk.status() === 'reading') {
-              return true;
-            }
-          }
-        } catch (err) {
-          _iterator.e(err);
-        } finally {
-          _iterator.f();
+    /**
+     * Indicates if string is being read at the moment
+     * @function
+     * @returns {boolean}
+     */
+    isReading() {
+      for (let chunk of this.chunks) {
+        if (chunk.status() === 'reading') {
+          return true;
         }
-
-        return false;
       }
-    }]);
+      return false;
+    }
+  }
 
-    return AsyncFlowFile;
-  }(FlowFile);
+  /**
+   * @license MIT
+   */
 
   /**
    * Flow.js is a library providing multiple simultaneous, stable and
@@ -6871,11 +1447,7 @@
    * @param {Function} [opts.generateUniqueIdentifier]
    * @constructor
    */
-
-  var Flow = /*#__PURE__*/function (_Eventizer) {
-    _inherits(Flow, _Eventizer);
-
-    var _super = _createSuper(Flow);
+  class Flow extends Eventizer {
 
     /**
      * For the events object:
@@ -6883,36 +1455,36 @@
      *  - values: array list of callbacks
      * All keys are lowercased as on() would do.
      */
-    function Flow(opts, events) {
-      var _this;
-
-      _classCallCheck(this, Flow);
+    constructor(opts, events) {
+      super(events);
 
-      _this = _super.call(this, events);
       /**
        * Library version
        * @type {string}
        */
-
       Flow.version = '3.0.0-alpha.0';
+
       /**
        * Check if directory upload is supported
        * @type {boolean}
        */
+      this.supportDirectory = (
+        /Chrome/.test(window.navigator.userAgent) ||
+        /Firefox/.test(window.navigator.userAgent) ||
+        /Edge/.test(window.navigator.userAgent)
+      );
 
-      _this.supportDirectory = /Chrome/.test(window.navigator.userAgent) || /Firefox/.test(window.navigator.userAgent) || /Edge/.test(window.navigator.userAgent);
       /**
        * List of FlowFile objects
        * @type {Array.<FlowFile>}
        */
+      this.files = [];
 
-      _this.files = [];
       /**
        * Default options for flow.js
        * @type {Object}
        */
-
-      _this.defaults = {
+      this.defaults = {
         chunkSize: 1024 * 1024,
         forceChunkSize: false,
         simultaneousUploads: 3,
@@ -6942,1098 +1514,555 @@
         readFileFn: webAPIFileRead,
         asyncReadFileFn: null
       };
-      /**
-       * Current options
-       * @type {Object}
-       */
-
-      _this.opts = {};
-      /**
-       * Current options
-       * @type {Object}
-       */
-
-      _this.opts = Object.assign({}, _this.defaults, opts || {}); // A workaround for using this.method.bind(this) as a (removable) event handler.
-      // https://stackoverflow.com/questions/11565471
-
-      _this._onDropBound = null;
-      return _this;
-    }
-    /**
-     * On drop event
-     * @function
-     * @param {MouseEvent} event
-     */
-
-
-    _createClass(Flow, [{
-      key: "onDrop",
-      value: function onDrop(event) {
-        if (this.opts.onDropStopPropagation) {
-          event.stopPropagation();
-        }
-
-        event.preventDefault();
-        var dataTransfer = event.dataTransfer;
-
-        if (dataTransfer.items && dataTransfer.items[0] && dataTransfer.items[0].webkitGetAsEntry) {
-          this.webkitReadDataTransfer(event);
-        } else {
-          this.addFiles(dataTransfer.files, event);
-        }
-      }
-      /**
-       * On drop event when file/stream initialization is asynchronous
-       * @function
-       * @param {MouseEvent} event
-       */
-
-    }, {
-      key: "asyncOnDrop",
-      value: function () {
-        var _asyncOnDrop = _asyncToGenerator( /*#__PURE__*/regeneratorRuntime.mark(function _callee(event) {
-          var dataTransfer;
-          return regeneratorRuntime.wrap(function _callee$(_context) {
-            while (1) {
-              switch (_context.prev = _context.next) {
-                case 0:
-                  if (this.opts.onDropStopPropagation) {
-                    event.stopPropagation();
-                  }
-
-                  event.preventDefault();
-                  dataTransfer = event.dataTransfer;
-
-                  if (!(dataTransfer.items && dataTransfer.items[0] && dataTransfer.items[0].webkitGetAsEntry)) {
-                    _context.next = 7;
-                    break;
-                  }
-
-                  this.webkitReadDataTransfer(event);
-                  _context.next = 9;
-                  break;
-
-                case 7:
-                  _context.next = 9;
-                  return this.asyncAddFiles(dataTransfer.files, event);
-
-                case 9:
-                case "end":
-                  return _context.stop();
-              }
-            }
-          }, _callee, this);
-        }));
-
-        function asyncOnDrop(_x) {
-          return _asyncOnDrop.apply(this, arguments);
-        }
-
-        return asyncOnDrop;
-      }()
-      /**
-       * Prevent default
-       * @function
-       * @param {MouseEvent} event
-       */
-
-    }, {
-      key: "preventEvent",
-      value: function preventEvent(event) {
-        event.preventDefault();
-      }
-      /**
-       * Read webkit dataTransfer object
-       * @param event
-       */
-
-    }, {
-      key: "webkitReadDataTransfer",
-      value: function webkitReadDataTransfer(event) {
-        var _this2 = this;
-
-        var queue = event.dataTransfer.items.length;
-
-        var decrement = function decrement() {
-          if (--queue == 0) {
-            _this2.addFiles(files, event);
-          }
-        };
-
-        var files = [];
-
-        var _iterator = _createForOfIteratorHelper(event.dataTransfer.items),
-            _step;
-
-        try {
-          for (_iterator.s(); !(_step = _iterator.n()).done;) {
-            var item = _step.value;
-            var entry = item.webkitGetAsEntry();
-
-            if (!entry) {
-              decrement();
-              return;
-            }
-
-            if (entry.isFile) {
-              // due to a bug in Chrome's File System API impl - #149735
-              fileReadSuccess(item.getAsFile(), entry.fullPath);
-            } else {
-              readDirectory(entry.createReader());
-            }
-          }
-        } catch (err) {
-          _iterator.e(err);
-        } finally {
-          _iterator.f();
-        }
-
-        function readDirectory(reader) {
-          reader.readEntries(function (entries) {
-            if (entries.length) {
-              queue += entries.length;
-              var fullPaths = {};
-
-              var _iterator2 = _createForOfIteratorHelper(entries),
-                  _step2;
-
-              try {
-                for (_iterator2.s(); !(_step2 = _iterator2.n()).done;) {
-                  var _entry = _step2.value;
-
-                  if (_entry.isFile) {
-                    fullPaths[_entry.name] = _entry.fullPath;
-
-                    _entry.file(function (file) {
-                      return fileReadSuccess(file, fullPaths[file.name]);
-                    }, readError);
-                  } else if (_entry.isDirectory) {
-                    readDirectory(_entry.createReader());
-                  }
-                }
-              } catch (err) {
-                _iterator2.e(err);
-              } finally {
-                _iterator2.f();
-              }
-
-              readDirectory(reader);
-            } else {
-              decrement();
-            }
-          }, readError);
-        }
 
-        function fileReadSuccess(file, fullPath) {
-          // relative path should not start with "/"
-          file.relativePath = fullPath.substring(1);
-          files.push(file);
-          decrement();
-        }
-
-        function readError(fileError) {
-          decrement();
-          throw fileError;
-        }
-      }
-      /**
-       * Generate unique identifier for a file
-       * @function
-       * @param {FlowFile} file
-       * @returns {string}
-       */
-
-    }, {
-      key: "generateUniqueIdentifier",
-      value: function generateUniqueIdentifier(file) {
-        var custom = this.opts.generateUniqueIdentifier;
-
-        if (typeof custom === 'function') {
-          return custom(file);
-        } // Some confusion in different versions of Firefox
-
-
-        var relativePath = file.relativePath || file.webkitRelativePath || file.fileName || file.name;
-        return file.size + '-' + relativePath.replace(/[^0-9a-zA-Z_-]/img, '');
-      }
-      /**
-       * Upload next chunk from the queue
-       * @function
-       * @returns {boolean}
-       * @private
-       */
-
-    }, {
-      key: "uploadNextChunk",
-      value: function uploadNextChunk(preventEvents) {
-        // In some cases (such as videos) it's really handy to upload the first
-        // and last chunk of a file quickly; this let's the server check the file's
-        // metadata and determine if there's even a point in continuing.
-        var found = false;
-
-        if (this.opts.prioritizeFirstAndLastChunk) {
-          var _iterator3 = _createForOfIteratorHelper(this.files),
-              _step3;
-
-          try {
-            for (_iterator3.s(); !(_step3 = _iterator3.n()).done;) {
-              var file = _step3.value;
-
-              if (!file.paused && file.chunks.length && file.chunks[0].status() === 'pending') {
-                file.chunks[0].send();
-                found = true;
-                break;
-              }
-
-              if (!file.paused && file.chunks.length > 1 && file.chunks[file.chunks.length - 1].status() === 'pending') {
-                file.chunks[file.chunks.length - 1].send();
-                found = true;
-                break;
-              }
-            }
-          } catch (err) {
-            _iterator3.e(err);
-          } finally {
-            _iterator3.f();
-          }
-
-          if (found) {
-            return found;
-          }
-        } // Now, simply look for the next, best thing to upload
-
-
-        var _iterator4 = _createForOfIteratorHelper(this.files),
-            _step4;
-
-        try {
-          outer_loop: for (_iterator4.s(); !(_step4 = _iterator4.n()).done;) {
-            var _file = _step4.value;
-
-            if (_file.paused) {
-              continue;
-            }
-
-            var _iterator6 = _createForOfIteratorHelper(_file.chunks),
-                _step6;
-
-            try {
-              for (_iterator6.s(); !(_step6 = _iterator6.n()).done;) {
-                var chunk = _step6.value;
-
-                if (chunk.status() === 'pending') {
-                  chunk.send();
-                  found = true;
-                  break outer_loop;
-                }
-              }
-            } catch (err) {
-              _iterator6.e(err);
-            } finally {
-              _iterator6.f();
-            }
-          }
-        } catch (err) {
-          _iterator4.e(err);
-        } finally {
-          _iterator4.f();
-        }
-
-        if (found) {
-          return true;
-        } // The are no more outstanding chunks to upload, check if everything is done
-
-
-        var outstanding = false;
-
-        var _iterator5 = _createForOfIteratorHelper(this.files),
-            _step5;
-
-        try {
-          for (_iterator5.s(); !(_step5 = _iterator5.n()).done;) {
-            var _file2 = _step5.value;
-
-            if (!_file2.isComplete()) {
-              outstanding = true;
-              break;
-            }
-          }
-        } catch (err) {
-          _iterator5.e(err);
-        } finally {
-          _iterator5.f();
-        }
-
-        if (!outstanding && !preventEvents) {
-          // All chunks have been uploaded, complete
-          this.emit('complete');
-        }
-
-        return false;
-      }
-      /**
-       * Assign a browse action to one or more DOM nodes.
-       * @function
-       * @param {Element|Array.<Element>} domNodes
-       * @param {boolean} isDirectory Pass in true to allow directories to
-       * @param {boolean} singleFile prevent multi file upload
-       * @param {Object} attributes set custom attributes:
-       *  http://www.w3.org/TR/html-markup/input.file.html#input.file-attributes
-       *  eg: accept: 'image/*'
-       * be selected (Chrome only).
-       */
-
-    }, {
-      key: "assignBrowse",
-      value: function assignBrowse(domNodes, isDirectory, singleFile, attributes) {
-        if (domNodes instanceof Element) {
-          domNodes = [domNodes];
-        }
-
-        each(domNodes, function (domNode) {
-          var _this3 = this;
-
-          var input;
-
-          if (domNode.tagName === 'INPUT' && domNode.type === 'file') {
-            input = domNode;
-          } else {
-            input = document.createElement('input');
-            input.setAttribute('type', 'file'); // display:none - not working in opera 12
-
-            Object.assign(input.style, {
-              visibility: 'hidden',
-              position: 'absolute',
-              width: '1px',
-              height: '1px'
-            }); // for opera 12 browser, input must be assigned to a document
-
-            domNode.appendChild(input); // https://developer.mozilla.org/en/using_files_from_web_applications)
-            // event listener is executed two times
-            // first one - original mouse click event
-            // second - input.click(), input is inside domNode
-
-            domNode.addEventListener('click', function () {
-              input.click();
-            }, false);
-          }
-
-          if (!this.opts.singleFile && !singleFile) {
-            input.setAttribute('multiple', 'multiple');
-          }
-
-          if (isDirectory) {
-            input.setAttribute('webkitdirectory', 'webkitdirectory');
-          }
+      /**
+       * Current options
+       * @type {Object}
+       */
+      this.opts = {};
 
-          each(attributes, function (value, key) {
-            input.setAttribute(key, value);
-          }); // When new files are added, simply append them to the overall list
-          // but adapt to the case where initFileFn is async.
-
-          var callback = this.opts.initFileFn && typeof this.opts.initFileFn === 'function' && this.opts.initFileFn.constructor.name === 'AsyncFunction' ? /*#__PURE__*/function () {
-            var _ref = _asyncToGenerator( /*#__PURE__*/regeneratorRuntime.mark(function _callee2(e) {
-              return regeneratorRuntime.wrap(function _callee2$(_context2) {
-                while (1) {
-                  switch (_context2.prev = _context2.next) {
-                    case 0:
-                      if (!e.target.value) {
-                        _context2.next = 6;
-                        break;
-                      }
-
-                      input.setAttribute('readonly', 'readonly');
-                      _context2.next = 4;
-                      return _this3.asyncAddFiles(e.target.files, e);
-
-                    case 4:
-                      e.target.value = '';
-                      input.removeAttribute('readonly');
-
-                    case 6:
-                    case "end":
-                      return _context2.stop();
-                  }
-                }
-              }, _callee2);
-            }));
-
-            return function (_x2) {
-              return _ref.apply(this, arguments);
-            };
-          }() : function (e) {
-            if (e.target.value) {
-              _this3.addFiles(e.target.files, e);
-
-              e.target.value = '';
-            }
-          };
-          input.addEventListener('change', callback, false);
-        }, this);
-      }
       /**
-       * Assign one or more DOM nodes as a drop target.
-       * @function
-       * @param {Element|Array.<Element>} domNodes
+       * Current options
+       * @type {Object}
        */
+      this.opts = Object.assign({}, this.defaults, opts || {});
 
-    }, {
-      key: "assignDrop",
-      value: function assignDrop(domNodes) {
-        if (typeof domNodes.length === 'undefined') {
-          domNodes = [domNodes];
-        }
+      // A workaround for using this.method.bind(this) as a (removable) event handler.
+      // https://stackoverflow.com/questions/11565471
+      this._onDropBound = null;
+    }
 
-        this._onDropBound = this.opts.initFileFn && typeof this.opts.initFileFn === 'function' && this.opts.initFileFn.constructor.name === 'AsyncFunction' ? this.asyncOnDrop.bind(this) : this.onDrop.bind(this);
+    /**
+     * On drop event
+     * @function
+     * @param {MouseEvent} event
+     */
+    onDrop(event) {
+      if (this.opts.onDropStopPropagation) {
+        event.stopPropagation();
+      }
+      event.preventDefault();
+      var dataTransfer = event.dataTransfer;
+      if (dataTransfer.items && dataTransfer.items[0] &&
+          dataTransfer.items[0].webkitGetAsEntry) {
+        this.webkitReadDataTransfer(event);
+      } else {
+        this.addFiles(dataTransfer.files, event);
+      }
+    }
 
-        var _iterator7 = _createForOfIteratorHelper(domNodes),
-            _step7;
+    /**
+     * Prevent default
+     * @function
+     * @param {MouseEvent} event
+     */
+    preventEvent(event) {
+      event.preventDefault();
+    }
 
-        try {
-          for (_iterator7.s(); !(_step7 = _iterator7.n()).done;) {
-            var domNode = _step7.value;
-            domNode.addEventListener('dragover', this.preventEvent, false);
-            domNode.addEventListener('dragenter', this.preventEvent, false);
-            domNode.addEventListener('drop', this._onDropBound, false);
-          }
-        } catch (err) {
-          _iterator7.e(err);
-        } finally {
-          _iterator7.f();
+    /**
+     * Read webkit dataTransfer object
+     * @param event
+     */
+    webkitReadDataTransfer(event) {
+      var queue = event.dataTransfer.items.length;
+      var decrement = () => {
+        if (--queue == 0) {
+          this.addFiles(files, event);
         }
-      }
-      /**
-       * Un-assign drop event from DOM nodes
-       * @function
-       * @param domNodes
-       */
+      };
 
-    }, {
-      key: "unAssignDrop",
-      value: function unAssignDrop(domNodes) {
-        if (typeof domNodes.length === 'undefined') {
-          domNodes = [domNodes];
+      var files = [];
+      for (let item of event.dataTransfer.items) {
+        var entry = item.webkitGetAsEntry();
+        if (!entry) {
+          decrement();
+          return ;
         }
-
-        var _iterator8 = _createForOfIteratorHelper(domNodes),
-            _step8;
-
-        try {
-          for (_iterator8.s(); !(_step8 = _iterator8.n()).done;) {
-            var domNode = _step8.value;
-            domNode.removeEventListener('dragover', this.preventEvent, false);
-            domNode.removeEventListener('dragenter', this.preventEvent, false);
-            domNode.removeEventListener('drop', this._onDropBound, false);
-          }
-        } catch (err) {
-          _iterator8.e(err);
-        } finally {
-          _iterator8.f();
+        if (entry.isFile) {
+          // due to a bug in Chrome's File System API impl - #149735
+          fileReadSuccess(item.getAsFile(), entry.fullPath);
+        } else {
+          readDirectory(entry.createReader());
         }
       }
-      /**
-       * Returns a boolean indicating whether or not the instance is currently
-       * uploading anything.
-       * @function
-       * @returns {boolean}
-       */
-
-    }, {
-      key: "isUploading",
-      value: function isUploading() {
-        var uploading = false;
-        each(this.files, function (file) {
-          if (file.isUploading()) {
-            uploading = true;
-            return false;
-          }
-        });
-        return uploading;
-      }
-      /**
-       * should upload next chunk
-       * @function
-       * @returns {boolean|number}
-       */
 
-    }, {
-      key: "_shouldUploadNext",
-      value: function _shouldUploadNext() {
-        var num = 0;
-        var should = true;
-        var simultaneousUploads = this.opts.simultaneousUploads;
-        each(this.files, function (file) {
-          each(file.chunks, function (chunk) {
-            if (chunk.status() === 'uploading') {
-              num++;
-
-              if (num >= simultaneousUploads) {
-                should = false;
-                return false;
+      function readDirectory(reader) {
+        reader.readEntries((entries) => {
+          if (entries.length) {
+            queue += entries.length;
+            var fullPaths = {};
+            for (let entry of entries) {
+              if (entry.isFile) {
+                fullPaths[entry.name] = entry.fullPath;
+                entry.file((file) => fileReadSuccess(file, fullPaths[file.name]), readError);
+              } else if (entry.isDirectory) {
+                readDirectory(entry.createReader());
               }
             }
-          });
-        }); // if should is true then return uploading chunks's length
-
-        return should && num;
+            readDirectory(reader);
+          } else {
+            decrement();
+          }
+        }, readError);
       }
-      /**
-       * Start or resume uploading.
-       * @function
-       */
-
-    }, {
-      key: "upload",
-      value: function upload() {
-        // Make sure we don't start too many uploads at once
-        var ret = this._shouldUploadNext();
-
-        if (ret === false) {
-          return;
-        } // Kick off the queue
-
+      function fileReadSuccess(file, fullPath) {
+        // relative path should not start with "/"
+        file.relativePath = fullPath.substring(1);
+        files.push(file);
+        decrement();
+      }
+      function readError(fileError) {
+        decrement();
+        throw fileError;
+      }
+    }
 
-        this.emit('upload-start');
-        var started = false;
+    /**
+     * Generate unique identifier for a file
+     * @function
+     * @param {FlowFile} file
+     * @returns {string}
+     */
+    async generateUniqueIdentifier(file) {
+      var custom = this.opts.generateUniqueIdentifier;
+      if (typeof custom === 'function') {
+        return await custom(file);
+      }
+      // Some confusion in different versions of Firefox
+      var relativePath = file.relativePath || file.webkitRelativePath || file.fileName || file.name;
+      return file.size + '-' + relativePath.replace(/[^0-9a-zA-Z_-]/img, '');
+    }
 
-        for (var num = 1; num <= this.opts.simultaneousUploads - ret; num++) {
-          started = this.uploadNextChunk(true) || started;
+    /**
+     * Upload next chunk from the queue
+     * @function
+     * @returns {boolean}
+     * @private
+     */
+    async uploadNextChunk(preventEvents) {
+      // In some cases (such as videos) it's really handy to upload the first
+      // and last chunk of a file quickly; this let's the server check the file's
+      // metadata and determine if there's even a point in continuing.
+      var found = false;
+      if (this.opts.prioritizeFirstAndLastChunk) {
+        for (let file of this.files) {
+          if (!file.paused && file.chunks.length &&
+              file.chunks[0].status() === 'pending') {
+            await file.chunks[0].send();
+            found = true;
+            break;
+          }
+          if (!file.paused && file.chunks.length > 1 &&
+              file.chunks[file.chunks.length - 1].status() === 'pending') {
+            await file.chunks[file.chunks.length - 1].send();
+            found = true;
+            break;
+          }
         }
-
-        if (!started) {
-          this.emit('complete');
+        if (found) {
+          return found;
         }
       }
-      /**
-       * Resume uploading.
-       * @function
-       */
 
-    }, {
-      key: "resume",
-      value: function resume() {
-        each(this.files, function (file) {
-          if (!file.isComplete()) {
-            file.resume();
+      // Now, simply look for the next, best thing to upload
+      outer_loop:
+      for (let file of this.files) {
+        if (file.paused) {
+          continue;
+        }
+        for (let chunk of file.chunks) {
+          if (chunk.status() === 'pending') {
+            await chunk.send();
+            found = true;
+            break outer_loop;
           }
-        });
+        }
       }
-      /**
-       * Pause uploading.
-       * @function
-       */
-
-    }, {
-      key: "pause",
-      value: function pause() {
-        each(this.files, function (file) {
-          file.pause();
-        });
+      if (found) {
+        return true;
       }
-      /**
-       * Cancel upload of all FlowFile objects and remove them from the list.
-       * @function
-       */
 
-    }, {
-      key: "cancel",
-      value: function cancel() {
-        for (var i = this.files.length - 1; i >= 0; i--) {
-          this.files[i].cancel();
+      // The are no more outstanding chunks to upload, check if everything is done
+      var outstanding = false;
+      for (let file of this.files) {
+        if (!file.isComplete()) {
+          outstanding = true;
+          break;
         }
       }
-      /**
-       * Returns a number between 0 and 1 indicating the current upload progress
-       * of all files.
-       * @function
-       * @returns {number}
-       */
 
-    }, {
-      key: "progress",
-      value: function progress() {
-        var totalDone = 0;
-        var totalSize = 0; // Resume all chunks currently being uploaded
-
-        each(this.files, function (file) {
-          totalDone += file.progress() * file.size;
-          totalSize += file.size;
-        });
-        return totalSize > 0 ? totalDone / totalSize : 0;
+      if (!outstanding && !preventEvents) {
+        // All chunks have been uploaded, complete
+        this.emit('complete');
       }
-      /**
-       * A generator to yield files and factor the sync part of the filtering logic used by both
-       * addFiles & asyncAddFiles
-       */
-
-    }, {
-      key: "filterFileList",
-      value: /*#__PURE__*/regeneratorRuntime.mark(function filterFileList(fileList, event) {
-        var ie10plus, _iterator9, _step9, file, uniqueIdentifier;
-
-        return regeneratorRuntime.wrap(function filterFileList$(_context3) {
-          while (1) {
-            switch (_context3.prev = _context3.next) {
-              case 0:
-                // ie10+
-                ie10plus = window.navigator.msPointerEnabled;
-                _iterator9 = _createForOfIteratorHelper(fileList);
-                _context3.prev = 2;
-
-                _iterator9.s();
-
-              case 4:
-                if ((_step9 = _iterator9.n()).done) {
-                  _context3.next = 17;
-                  break;
-                }
-
-                file = _step9.value;
-
-                if (!(ie10plus && file.size === 0 || file.size % 4096 === 0 && (file.name === '.' || file.fileName === '.'))) {
-                  _context3.next = 8;
-                  break;
-                }
-
-                return _context3.abrupt("continue", 15);
-
-              case 8:
-                uniqueIdentifier = this.generateUniqueIdentifier(file);
-
-                if (!(!this.opts.allowDuplicateUploads && this.getFromUniqueIdentifier(uniqueIdentifier))) {
-                  _context3.next = 11;
-                  break;
-                }
-
-                return _context3.abrupt("continue", 15);
-
-              case 11:
-                if (this.hook('filter-file', file, event)) {
-                  _context3.next = 13;
-                  break;
-                }
-
-                return _context3.abrupt("continue", 15);
+      return false;
+    }
 
-              case 13:
-                _context3.next = 15;
-                return [file, uniqueIdentifier];
 
-              case 15:
-                _context3.next = 4;
-                break;
+    /**
+     * Assign a browse action to one or more DOM nodes.
+     * @function
+     * @param {Element|Array.<Element>} domNodes
+     * @param {boolean} isDirectory Pass in true to allow directories to
+     * @param {boolean} singleFile prevent multi file upload
+     * @param {Object} attributes set custom attributes:
+     *  http://www.w3.org/TR/html-markup/input.file.html#input.file-attributes
+     *  eg: accept: 'image/*'
+     * be selected (Chrome only).
+     */
+    async assignBrowse(domNodes, isDirectory, singleFile, attributes) {
+      if (domNodes instanceof Element) {
+        domNodes = [domNodes];
+      }
 
-              case 17:
-                _context3.next = 22;
-                break;
+      each(domNodes, function (domNode) {
+        var input;
+        if (domNode.tagName === 'INPUT' && domNode.type === 'file') {
+          input = domNode;
+        } else {
+          input = document.createElement('input');
+          input.setAttribute('type', 'file');
+          // display:none - not working in opera 12
+          Object.assign(input.style, {
+            visibility: 'hidden',
+            position: 'absolute',
+            width: '1px',
+            height: '1px'
+          });
+          // for opera 12 browser, input must be assigned to a document
+          domNode.appendChild(input);
+          // https://developer.mozilla.org/en/using_files_from_web_applications)
+          // event listener is executed two times
+          // first one - original mouse click event
+          // second - input.click(), input is inside domNode
+          domNode.addEventListener('click', function() {
+            input.click();
+          }, false);
+        }
+        if (!this.opts.singleFile && !singleFile) {
+          input.setAttribute('multiple', 'multiple');
+        }
+        if (isDirectory) {
+          input.setAttribute('webkitdirectory', 'webkitdirectory');
+        }
+        each(attributes, function (value, key) {
+          input.setAttribute(key, value);
+        });
+        // When new files are added, simply append them to the overall list
+        input.addEventListener('change', async e => {
+          if (e.target.value) {
+            await this.addFiles(e.target.files, e);
+            e.target.value = '';
+          }
+        }, false);
+      }, this);
+    }
 
-              case 19:
-                _context3.prev = 19;
-                _context3.t0 = _context3["catch"](2);
+    /**
+     * Assign one or more DOM nodes as a drop target.
+     * @function
+     * @param {Element|Array.<Element>} domNodes
+     */
+    assignDrop(domNodes) {
+      if (typeof domNodes.length === 'undefined') {
+        domNodes = [domNodes];
+      }
 
-                _iterator9.e(_context3.t0);
+      this._onDropBound = this.onDrop.bind(this);
+      for (let domNode of domNodes) {
+        domNode.addEventListener('dragover', this.preventEvent, false);
+        domNode.addEventListener('dragenter', this.preventEvent, false);
+        domNode.addEventListener('drop', this._onDropBound, false);
+      }
+    }
 
-              case 22:
-                _context3.prev = 22;
+    /**
+     * Un-assign drop event from DOM nodes
+     * @function
+     * @param domNodes
+     */
+    unAssignDrop(domNodes) {
+      if (typeof domNodes.length === 'undefined') {
+        domNodes = [domNodes];
+      }
 
-                _iterator9.f();
+      for (let domNode of domNodes) {
+        domNode.removeEventListener('dragover', this.preventEvent, false);
+        domNode.removeEventListener('dragenter', this.preventEvent, false);
+        domNode.removeEventListener('drop', this._onDropBound, false);
+      }
+    }
 
-                return _context3.finish(22);
+    /**
+     * Returns a boolean indicating whether or not the instance is currently
+     * uploading anything.
+     * @function
+     * @returns {boolean}
+     */
+    isUploading() {
+      var uploading = false;
+      each(this.files, function (file) {
+        if (file.isUploading()) {
+          uploading = true;
+          return false;
+        }
+      });
+      return uploading;
+    }
 
-              case 25:
-              case "end":
-                return _context3.stop();
+    /**
+     * should upload next chunk
+     * @function
+     * @returns {boolean|number}
+     */
+    _shouldUploadNext() {
+      var num = 0;
+      var should = true;
+      var simultaneousUploads = this.opts.simultaneousUploads;
+      each(this.files, function (file) {
+        each(file.chunks, function(chunk) {
+          if (chunk.status() === 'uploading') {
+            num++;
+            if (num >= simultaneousUploads) {
+              should = false;
+              return false;
             }
           }
-        }, filterFileList, this, [[2, 19, 22, 25]]);
-      })
-      /**
-       * Add a HTML5 File object to the list of files.
-       * @function
-       * @param {File} file
-       * @param Any other parameters supported by addFiles
-       */
-
-    }, {
-      key: "addFile",
-      value: function addFile(file) {
-        for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
-          args[_key - 1] = arguments[_key];
-        }
+        });
+      });
+      // if should is true then return uploading chunks's length
+      return should && num;
+    }
 
-        this.addFiles.apply(this, [[file]].concat(args));
+    /**
+     * Start or resume uploading.
+     * @function
+     */
+    async upload() {
+      // Make sure we don't start too many uploads at once
+      var ret = this._shouldUploadNext();
+      if (ret === false) {
+        return;
       }
-      /**
-       * Add a HTML5 File object to the list of files.
-       * @function
-       * @param {FileList|Array} fileList
-       * @param {Event} [event] event is optional
-       */
-
-    }, {
-      key: "addFiles",
-      value: function addFiles(fileList) {
-        var event = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : null;
-        var initFileFn = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : this.opts.initFileFn;
+      // Kick off the queue
+      this.emit('upload-start');
+      var started = false;
+      for (var num = 1; num <= this.opts.simultaneousUploads - ret; num++) {
+        started = await this.uploadNextChunk(true) || started;
+      }
+      if (!started) {
+        this.emit('complete');
+      }
+    }
 
-        if (this.hasHook(true)) {
-          console.warn('Using addFiles() while settings asynchronous events can lead to unpredictable results. Use asyncAddFiles() instead.');
+    /**
+     * Resume uploading.
+     * @function
+     */
+    resume() {
+      each(this.files, function (file) {
+        if (!file.isComplete()) {
+          file.resume();
         }
+      });
+    }
 
-        var item,
-            file,
-            uniqueIdentifier,
-            files = [];
-        var iterator = this.filterFileList(fileList, event);
-
-        while ((item = iterator.next()) && !item.done) {
-          var _item$value = _slicedToArray(item.value, 2);
-
-          file = _item$value[0];
-          uniqueIdentifier = _item$value[1];
-          var f = new FlowFile(this, file, uniqueIdentifier);
-          f.bootstrap(event, initFileFn);
-          this.hook('file-added', f, event);
-          this.aHook('file-added', f, event);
+    /**
+     * Pause uploading.
+     * @function
+     */
+    pause() {
+      each(this.files, function (file) {
+        file.pause();
+      });
+    }
 
-          if (!f.file) {
-            continue;
-          }
+    /**
+     * Cancel upload of all FlowFile objects and remove them from the list.
+     * @function
+     */
+    cancel() {
+      for (var i = this.files.length - 1; i >= 0; i--) {
+        this.files[i].cancel();
+      }
+    }
 
-          files.push(f);
-        }
+    /**
+     * Returns a number between 0 and 1 indicating the current upload progress
+     * of all files.
+     * @function
+     * @returns {number}
+     */
+    progress() {
+      var totalDone = 0;
+      var totalSize = 0;
+      // Resume all chunks currently being uploaded
+      each(this.files, function (file) {
+        totalDone += file.progress() * file.size;
+        totalSize += file.size;
+      });
+      return totalSize > 0 ? totalDone / totalSize : 0;
+    }
 
-        this.hook('files-added', files, event);
-        this.aHook('files-added', files, event);
-        files = files.filter(function (e) {
-          return e;
-        });
+    /**
+     * Add a HTML5 File object to the list of files.
+     * @function
+     * @param {File} file
+     * @param Any other parameters supported by addFiles.
+     *
+     * @return (async) An initialized <AsyncFlowFile>.
+     */
+    async addFile(file, ...args) {
+      return (await this.addFiles([file], ...args))[0];
+    }
 
-        var _iterator10 = _createForOfIteratorHelper(files),
-            _step10;
+    /**
+     * Add a HTML5 File object to the list of files.
+     * @function
+     * @param {FileList|Array} fileList
+     * @param {Event} [event] event is optional
+     *
+     * @return Promise{[<AsyncFlowFile>,...]} The promise of getting an array of AsyncFlowFile.
+     */
+    async addFiles(fileList, event = null, initFileFn = this.opts.initFileFn) {
+      let states = [];
 
-        try {
-          for (_iterator10.s(); !(_step10 = _iterator10.n()).done;) {
-            file = _step10.value;
+      const ie10plus = window.navigator.msPointerEnabled;
 
-            if (this.opts.singleFile && this.files.length > 0) {
-              this.removeFile(this.files[0]);
-            }
+      for (let file of fileList) {
+        // https://github.com/flowjs/flow.js/issues/55
+        if ((ie10plus && file.size === 0) || (file.size % 4096 === 0 && (file.name === '.' || file.fileName === '.'))) {
+          // console.log(`file ${file.name} empty. skipping`);
+          continue;
+        }
 
-            this.files.push(file); // console.log(`enqueue file ${file.name} of ${file.chunks.length} chunks`);
-          }
-        } catch (err) {
-          _iterator10.e(err);
-        } finally {
-          _iterator10.f();
+        var uniqueIdentifier = await this.generateUniqueIdentifier(file);
+        if (!this.opts.allowDuplicateUploads && this.getFromUniqueIdentifier(uniqueIdentifier)) {
+          // console.log(`file ${file.name} non-unique. skipping`);
+          continue;
         }
 
-        this.hook('files-submitted', this.files, event);
-        this.aHook('files-submitted', this.files, event);
-      }
-      /**
-       * Add a HTML5 File object to the list of files.
-       * @function
-       * @param {File} file
-       * @param Any other parameters supported by asyncAddFiles.
-       *
-       * @return (async) An initialized <AsyncFlowFile>.
-       */
+        if (! await this.hook('filter-file', file, event)) {
+          // console.log(`file ${file.name} filtered-out. skipping`);
+          continue;
+        }
 
-    }, {
-      key: "asyncAddFile",
-      value: function () {
-        var _asyncAddFile = _asyncToGenerator( /*#__PURE__*/regeneratorRuntime.mark(function _callee3(file) {
-          var _len2,
-              args,
-              _key2,
-              _args4 = arguments;
-
-          return regeneratorRuntime.wrap(function _callee3$(_context4) {
-            while (1) {
-              switch (_context4.prev = _context4.next) {
-                case 0:
-                  for (_len2 = _args4.length, args = new Array(_len2 > 1 ? _len2 - 1 : 0), _key2 = 1; _key2 < _len2; _key2++) {
-                    args[_key2 - 1] = _args4[_key2];
-                  }
-
-                  _context4.next = 3;
-                  return this.asyncAddFiles.apply(this, [[file]].concat(args));
-
-                case 3:
-                  return _context4.abrupt("return", _context4.sent[0]);
-
-                case 4:
-                case "end":
-                  return _context4.stop();
-              }
-            }
-          }, _callee3, this);
-        }));
+        let flowFile = new AsyncFlowFile(this, file, uniqueIdentifier);
 
-        function asyncAddFile(_x3) {
-          return _asyncAddFile.apply(this, arguments);
-        }
+        let state = flowFile.bootstrap(event, initFileFn);
+        states.push(state);
+      }
 
-        return asyncAddFile;
-      }()
-      /**
-       * Add a HTML5 File object to the list of files.
-       * @function
-       * @param {FileList|Array} fileList
-       * @param {Event} [event] event is optional
-       *
-       * @return Promise{[<AsyncFlowFile>,...]} The promise of getting an array of AsyncFlowFile.
-       */
+      let flowFiles = await Promise.all(states);
+      for (let ff of flowFiles) {
+        await this.hook('file-added', ff, event);
+      }
 
-    }, {
-      key: "asyncAddFiles",
-      value: function () {
-        var _asyncAddFiles = _asyncToGenerator( /*#__PURE__*/regeneratorRuntime.mark(function _callee4(fileList) {
-          var event,
-              initFileFn,
-              item,
-              file,
-              uniqueIdentifier,
-              states,
-              iterator,
-              _item$value2,
-              flowFile,
-              state,
-              flowfiles,
-              _iterator11,
-              _step11,
-              ff,
-              _iterator12,
-              _step12,
-              _file3,
-              _args5 = arguments;
-
-          return regeneratorRuntime.wrap(function _callee4$(_context5) {
-            while (1) {
-              switch (_context5.prev = _context5.next) {
-                case 0:
-                  event = _args5.length > 1 && _args5[1] !== undefined ? _args5[1] : null;
-                  initFileFn = _args5.length > 2 && _args5[2] !== undefined ? _args5[2] : this.opts.initFileFn;
-                  states = [];
-                  iterator = this.filterFileList(fileList, event);
-
-                case 4:
-                  if (!((item = iterator.next()) && !item.done)) {
-                    _context5.next = 16;
-                    break;
-                  }
-
-                  _item$value2 = _slicedToArray(item.value, 2);
-                  file = _item$value2[0];
-                  uniqueIdentifier = _item$value2[1];
-                  _context5.next = 10;
-                  return this.aHook('filter-file', file, event);
-
-                case 10:
-                  if (_context5.sent) {
-                    _context5.next = 12;
-                    break;
-                  }
-
-                  return _context5.abrupt("continue", 4);
-
-                case 12:
-                  // ToDo: parallelizable ?
-                  flowFile = new AsyncFlowFile(this, file, uniqueIdentifier), state = flowFile.bootstrap(event, initFileFn);
-                  states.push(state);
-                  _context5.next = 4;
-                  break;
-
-                case 16:
-                  _context5.next = 18;
-                  return Promise.all(states);
-
-                case 18:
-                  flowfiles = _context5.sent;
-                  _iterator11 = _createForOfIteratorHelper(flowfiles);
-                  _context5.prev = 20;
-
-                  _iterator11.s();
-
-                case 22:
-                  if ((_step11 = _iterator11.n()).done) {
-                    _context5.next = 29;
-                    break;
-                  }
-
-                  ff = _step11.value;
-                  this.hook('file-added', ff, event);
-                  _context5.next = 27;
-                  return this.aHook('file-added', ff, event);
-
-                case 27:
-                  _context5.next = 22;
-                  break;
-
-                case 29:
-                  _context5.next = 34;
-                  break;
-
-                case 31:
-                  _context5.prev = 31;
-                  _context5.t0 = _context5["catch"](20);
-
-                  _iterator11.e(_context5.t0);
-
-                case 34:
-                  _context5.prev = 34;
-
-                  _iterator11.f();
-
-                  return _context5.finish(34);
-
-                case 37:
-                  this.hook('files-added', flowfiles, event);
-                  _context5.next = 40;
-                  return this.aHook('files-added', flowfiles, event);
-
-                case 40:
-                  flowfiles = flowfiles.filter(function (e) {
-                    return e && e.file;
-                  });
-                  _iterator12 = _createForOfIteratorHelper(flowfiles);
-
-                  try {
-                    for (_iterator12.s(); !(_step12 = _iterator12.n()).done;) {
-                      _file3 = _step12.value;
-
-                      if (this.opts.singleFile && this.files.length > 0) {
-                        this.removeFile(this.files[0]);
-                      }
-
-                      this.files.push(_file3);
-                    }
-                  } catch (err) {
-                    _iterator12.e(err);
-                  } finally {
-                    _iterator12.f();
-                  }
-
-                  this.hook('files-submitted', this.files, event);
-                  _context5.next = 46;
-                  return this.aHook('files-submitted', this.files, event);
-
-                case 46:
-                  return _context5.abrupt("return", flowfiles);
-
-                case 47:
-                case "end":
-                  return _context5.stop();
-              }
-            }
-          }, _callee4, this, [[20, 31, 34, 37]]);
-        }));
+      // TODO: It's kinda ugly to have the same filter run once after both hooks,
+      // but it matches the old v2 and v3's synchronous behaviour where `files-added`
+      // received the list filtered by individual `file-added`s
+      flowFiles = flowFiles.filter(f => f && f.file);
 
-        function asyncAddFiles(_x4) {
-          return _asyncAddFiles.apply(this, arguments);
-        }
+      await this.hook('files-added', flowFiles, event);
 
-        return asyncAddFiles;
-      }()
-      /**
-       * Cancel upload of a specific FlowFile object from the list.
-       * @function
-       * @param {FlowFile} file
-       */
+      // TODO: see above
+      flowFiles = flowFiles.filter(f => f && f.file);
 
-    }, {
-      key: "removeFile",
-      value: function removeFile(file) {
-        for (var i = this.files.length - 1; i >= 0; i--) {
-          if (this.files[i] === file) {
-            this.files.splice(i, 1);
-            file.abort();
-            this.emit('file-removed', file);
-          }
+      for (let file of flowFiles) {
+        if (this.opts.singleFile && this.files.length > 0) {
+          this.removeFile(this.files[0]);
         }
+        this.files.push(file);
       }
-      /**
-       * Look up a FlowFile object by its unique identifier.
-       * @function
-       * @param {string} uniqueIdentifier
-       * @returns {boolean|FlowFile} false if file was not found
-       */
 
-    }, {
-      key: "getFromUniqueIdentifier",
-      value: function getFromUniqueIdentifier(uniqueIdentifier) {
-        var ret = false;
-        each(this.files, function (file) {
-          if (file.uniqueIdentifier === uniqueIdentifier) {
-            ret = file;
-          }
-        });
-        return ret;
-      }
-      /**
-       * Returns the total size of all files in bytes.
-       * @function
-       * @returns {number}
-       */
+      await this.hook('files-submitted', this.files, event);
 
-    }, {
-      key: "getSize",
-      value: function getSize() {
-        var totalSize = 0;
-        each(this.files, function (file) {
-          totalSize += file.size;
-        });
-        return totalSize;
-      }
-      /**
-       * Returns the total size uploaded of all files in bytes.
-       * @function
-       * @returns {number}
-       */
+      return flowFiles;
+    }
 
-    }, {
-      key: "sizeUploaded",
-      value: function sizeUploaded() {
-        var size = 0;
-        each(this.files, function (file) {
-          size += file.sizeUploaded();
-        });
-        return size;
+    /**
+     * Cancel upload of a specific FlowFile object from the list.
+     * @function
+     * @param {FlowFile} file
+     */
+    removeFile(file) {
+      for (var i = this.files.length - 1; i >= 0; i--) {
+        if (this.files[i] === file) {
+          this.files.splice(i, 1);
+          file.abort();
+          this.emit('file-removed', file);
+          break;
+        }
       }
-      /**
-       * Returns remaining time to upload all files in seconds. Accuracy is based on average speed.
-       * If speed is zero, time remaining will be equal to positive infinity `Number.POSITIVE_INFINITY`
-       * @function
-       * @returns {number}
-       */
-
-    }, {
-      key: "timeRemaining",
-      value: function timeRemaining() {
-        var sizeDelta = 0;
-        var averageSpeed = 0;
-        each(this.files, function (file) {
-          if (!file.paused && !file.error) {
-            sizeDelta += file.size - file.sizeUploaded();
-            averageSpeed += file.averageSpeed;
-          }
-        });
+    }
 
-        if (sizeDelta && !averageSpeed) {
-          return Number.POSITIVE_INFINITY;
+    /**
+     * Look up a FlowFile object by its unique identifier.
+     * @function
+     * @param {string} uniqueIdentifier
+     * @returns {boolean|FlowFile} false if file was not found
+     */
+    getFromUniqueIdentifier(uniqueIdentifier) {
+      var ret = false;
+      each(this.files, function (file) {
+        if (file.uniqueIdentifier === uniqueIdentifier) {
+          ret = file;
         }
+      });
+      return ret;
+    }
 
-        if (!sizeDelta && !averageSpeed) {
-          return 0;
-        }
+    /**
+     * Returns the total size of all files in bytes.
+     * @function
+     * @returns {number}
+     */
+    getSize() {
+      var totalSize = 0;
+      each(this.files, function (file) {
+        totalSize += file.size;
+      });
+      return totalSize;
+    }
 
-        return Math.floor(sizeDelta / averageSpeed);
-      }
-    }]);
+    /**
+     * Returns the total size uploaded of all files in bytes.
+     * @function
+     * @returns {number}
+     */
+    sizeUploaded() {
+      var size = 0;
+      each(this.files, function (file) {
+        size += file.sizeUploaded();
+      });
+      return size;
+    }
 
-    return Flow;
-  }(_default);
+    /**
+     * Returns remaining time to upload all files in seconds. Accuracy is based on average speed.
+     * If speed is zero, time remaining will be equal to positive infinity `Number.POSITIVE_INFINITY`
+     * @function
+     * @returns {number}
+     */
+    timeRemaining() {
+      var sizeDelta = 0;
+      var averageSpeed = 0;
+      each(this.files, function (file) {
+        if (!file.paused && !file.error) {
+          sizeDelta += file.size - file.sizeUploaded();
+          averageSpeed += file.averageSpeed;
+        }
+      });
+      if (sizeDelta && !averageSpeed) {
+        return Number.POSITIVE_INFINITY;
+      }
+      if (!sizeDelta && !averageSpeed) {
+        return 0;
+      }
+      return Math.floor(sizeDelta / averageSpeed);
+    }
+  }
 
   return Flow;
 
diff --git a/dist/flow.min.js b/dist/flow.min.js
index ceea935..5ba06a9 100644
--- a/dist/flow.min.js
+++ b/dist/flow.min.js
@@ -1,3 +1,5 @@
-/*! @flowjs/flow.js 3.0.0-alpha.0 */
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t=0;oa(this.chunks,(function(e){t+=e.progress()*(e.endByte-e.startByte)}));var e=t/this.size;return this._prevProgress=Math.max(this._prevProgress,e>.9999?1:e),this._prevProgress}},{key:"isUploading",value:function(){var t=!1;return oa(this.chunks,(function(e){if("uploading"===e.status())return t=!0,!1})),t}},{key:"isComplete",value:function(){var t=!1;return oa(this.chunks,(function(e){var r=e.status();if("pending"===r||"uploading"===r||"reading"===r||1===e.preprocessState||1===e.readState)return t=!0,!1})),!t}},{key:"sizeUploaded",value:function(){var t=0;return oa(this.chunks,(function(e){t+=e.sizeUploaded()})),t}},{key:"timeRemaining",value:function(){if(this.paused||this.error)return 0;var t=this.size-this.sizeUploaded();return t&&!this.averageSpeed?Number.POSITIVE_INFINITY:t||this.averageSpeed?Math.floor(t/this.averageSpeed):0}},{key:"getType",value:function(){return this.file.type&&this.file.type.split("/")[1]}},{key:"getExtension",value:function(){return this.name.substr(2+(~-this.name.lastIndexOf(".")>>>0)).toLowerCase()}}]),t}();("undefined"!=typeof window?window:"undefined"!=typeof global?global:"undefined"!=typeof self?self:{}).FlowFile=Za;var Qa=function(t){c(s,Za);var e,i,a=y(s);function s(){return n(this,s),a.apply(this,arguments)}return o(s,[{key:"retry",value:(i=r(regeneratorRuntime.mark((function t(){return regeneratorRuntime.wrap((function(t){for(;;)switch(t.prev=t.next){case 0:return t.next=2,this.bootstrap("retry");case 2:return t.abrupt("return",this.flowObj.upload());case 3:case"end":return t.stop()}}),t,this)}))),function(){return i.apply(this,arguments)})},{key:"bootstrap",value:(e=r(regeneratorRuntime.mark((function t(){var e,r,n=arguments;return regeneratorRuntime.wrap((function(t){for(;;)switch(t.prev=t.next){case 0:if(e=n.length>0&&void 0!==n[0]?n[0]:null,"function"!=typeof(r=n.length>1&&void 0!==n[1]?n[1]:this.flowObj.opts.initFileFn)){t.next=5;break}return t.next=5,r(this,e);case 5:return this._bootstrap(),"retry"!==e&&this.flowObj.hook("file-added",this,e),t.abrupt("return",this);case 8:case"end":return t.stop()}}),t,this)}))),function(){return e.apply(this,arguments)})},{key:"isReading",value:function(){var t,e=w(this.chunks);try{for(e.s();!(t=e.n()).done;){if("reading"===t.value.status())return!0}}catch(t){e.e(t)}finally{e.f()}return!1}}]),s}(),ts=function(t){c(u,Do);var e,i,a,s=y(u);function u(t,e){var r;return n(this,u),r=s.call(this,e),u.version="3.0.0-alpha.0",r.supportDirectory=/Chrome/.test(window.navigator.userAgent)||/Firefox/.test(window.navigator.userAgent)||/Edge/.test(window.navigator.userAgent),r.files=[],r.defaults={chunkSize:1048576,forceChunkSize:!1,simultaneousUploads:3,singleFile:!1,fileParameterName:"file",progressCallbacksInterval:500,speedSmoothingFactor:.1,query:{},headers:{},withCredentials:!1,preprocess:null,changeRawDataBeforeSend:null,method:"multipart",testMethod:"GET",uploadMethod:"POST",prioritizeFirstAndLastChunk:!1,allowDuplicateUploads:!1,target:"/",testChunks:!0,generateUniqueIdentifier:null,maxChunkRetries:0,chunkRetryInterval:null,permanentErrors:[404,413,415,500,501],successStatuses:[200,201,202],onDropStopPropagation:!1,initFileFn:null,readFileFn:na,asyncReadFileFn:null},r.opts={},r.opts=Object.assign({},r.defaults,t||{}),r._onDropBound=null,r}return o(u,[{key:"onDrop",value:function(t){this.opts.onDropStopPropagation&&t.stopPropagation(),t.preventDefault();var e=t.dataTransfer;e.items&&e.items[0]&&e.items[0].webkitGetAsEntry?this.webkitReadDataTransfer(t):this.addFiles(e.files,t)}},{key:"asyncOnDrop",value:(a=r(regeneratorRuntime.mark((function t(e){var r;return regeneratorRuntime.wrap((function(t){for(;;)switch(t.prev=t.next){case 0:if(this.opts.onDropStopPropagation&&e.stopPropagation(),e.preventDefault(),!((r=e.dataTransfer).items&&r.items[0]&&r.items[0].webkitGetAsEntry)){t.next=7;break}this.webkitReadDataTransfer(e),t.next=9;break;case 7:return t.next=9,this.asyncAddFiles(r.files,e);case 9:case"end":return t.stop()}}),t,this)}))),function(t){return a.apply(this,arguments)})},{key:"preventEvent",value:function(t){t.preventDefault()}},{key:"webkitReadDataTransfer",value:function(t){var e,r=this,n=t.dataTransfer.items.length,i=function(){0==--n&&r.addFiles(o,t)},o=[],a=w(t.dataTransfer.items);try{for(a.s();!(e=a.n()).done;){var s=e.value,u=s.webkitGetAsEntry();if(!u)return void i();u.isFile?l(s.getAsFile(),u.fullPath):c(u.createReader())}}catch(t){a.e(t)}finally{a.f()}function c(t){t.readEntries((function(e){if(e.length){n+=e.length;var r,o={},a=w(e);try{for(a.s();!(r=a.n()).done;){var s=r.value;s.isFile?(o[s.name]=s.fullPath,s.file((function(t){return l(t,o[t.name])}),f)):s.isDirectory&&c(s.createReader())}}catch(t){a.e(t)}finally{a.f()}c(t)}else i()}),f)}function l(t,e){t.relativePath=e.substring(1),o.push(t),i()}function f(t){throw i(),t}}},{key:"generateUniqueIdentifier",value:function(t){var e=this.opts.generateUniqueIdentifier;if("function"==typeof e)return e(t);var r=t.relativePath||t.webkitRelativePath||t.fileName||t.name;return t.size+"-"+r.replace(/[^0-9a-zA-Z_-]/gim,"")}},{key:"uploadNextChunk",value:function(t){var e=!1;if(this.opts.prioritizeFirstAndLastChunk){var r,n=w(this.files);try{for(n.s();!(r=n.n()).done;){var i=r.value;if(!i.paused&&i.chunks.length&&"pending"===i.chunks[0].status()){i.chunks[0].send(),e=!0;break}if(!i.paused&&i.chunks.length>1&&"pending"===i.chunks[i.chunks.length-1].status()){i.chunks[i.chunks.length-1].send(),e=!0;break}}}catch(t){n.e(t)}finally{n.f()}if(e)return e}var o,a=w(this.files);try{t:for(a.s();!(o=a.n()).done;){var s=o.value;if(!s.paused){var u,c=w(s.chunks);try{for(c.s();!(u=c.n()).done;){var l=u.value;if("pending"===l.status()){l.send(),e=!0;break t}}}catch(t){c.e(t)}finally{c.f()}}}}catch(t){a.e(t)}finally{a.f()}if(e)return!0;var f,h=!1,p=w(this.files);try{for(p.s();!(f=p.n()).done;){if(!f.value.isComplete()){h=!0;break}}}catch(t){p.e(t)}finally{p.f()}return h||t||this.emit("complete"),!1}},{key:"assignBrowse",value:function(t,e,n,i){t instanceof Element&&(t=[t]),oa(t,(function(t){var o,a=this;"INPUT"===t.tagName&&"file"===t.type?o=t:((o=document.createElement("input")).setAttribute("type","file"),Object.assign(o.style,{visibility:"hidden",position:"absolute",width:"1px",height:"1px"}),t.appendChild(o),t.addEventListener("click",(function(){o.click()}),!1)),this.opts.singleFile||n||o.setAttribute("multiple","multiple"),e&&o.setAttribute("webkitdirectory","webkitdirectory"),oa(i,(function(t,e){o.setAttribute(e,t)}));var s=this.opts.initFileFn&&"function"==typeof this.opts.initFileFn&&"AsyncFunction"===this.opts.initFileFn.constructor.name?function(){var t=r(regeneratorRuntime.mark((function t(e){return regeneratorRuntime.wrap((function(t){for(;;)switch(t.prev=t.next){case 0:if(!e.target.value){t.next=6;break}return o.setAttribute("readonly","readonly"),t.next=4,a.asyncAddFiles(e.target.files,e);case 4:e.target.value="",o.removeAttribute("readonly");case 6:case"end":return t.stop()}}),t)})));return function(e){return t.apply(this,arguments)}}():function(t){t.target.value&&(a.addFiles(t.target.files,t),t.target.value="")};o.addEventListener("change",s,!1)}),this)}},{key:"assignDrop",value:function(t){void 0===t.length&&(t=[t]),this._onDropBound=this.opts.initFileFn&&"function"==typeof this.opts.initFileFn&&"AsyncFunction"===this.opts.initFileFn.constructor.name?this.asyncOnDrop.bind(this):this.onDrop.bind(this);var e,r=w(t);try{for(r.s();!(e=r.n()).done;){var n=e.value;n.addEventListener("dragover",this.preventEvent,!1),n.addEventListener("dragenter",this.preventEvent,!1),n.addEventListener("drop",this._onDropBound,!1)}}catch(t){r.e(t)}finally{r.f()}}},{key:"unAssignDrop",value:function(t){void 0===t.length&&(t=[t]);var e,r=w(t);try{for(r.s();!(e=r.n()).done;){var n=e.value;n.removeEventListener("dragover",this.preventEvent,!1),n.removeEventListener("dragenter",this.preventEvent,!1),n.removeEventListener("drop",this._onDropBound,!1)}}catch(t){r.e(t)}finally{r.f()}}},{key:"isUploading",value:function(){var t=!1;return oa(this.files,(function(e){if(e.isUploading())return t=!0,!1})),t}},{key:"_shouldUploadNext",value:function(){var t=0,e=!0,r=this.opts.simultaneousUploads;return oa(this.files,(function(n){oa(n.chunks,(function(n){if("uploading"===n.status()&&++t>=r)return e=!1,!1}))})),e&&t}},{key:"upload",value:function(){var t=this._shouldUploadNext();if(!1!==t){this.emit("upload-start");for(var e=!1,r=1;r<=this.opts.simultaneousUploads-t;r++)e=this.uploadNextChunk(!0)||e;e||this.emit("complete")}}},{key:"resume",value:function(){oa(this.files,(function(t){t.isComplete()||t.resume()}))}},{key:"pause",value:function(){oa(this.files,(function(t){t.pause()}))}},{key:"cancel",value:function(){for(var t=this.files.length-1;t>=0;t--)this.files[t].cancel()}},{key:"progress",value:function(){var t=0,e=0;return oa(this.files,(function(r){t+=r.progress()*r.size,e+=r.size})),e>0?t/e:0}},{key:"filterFileList",value:regeneratorRuntime.mark((function t(e,r){var n,i,o,a,s;return regeneratorRuntime.wrap((function(t){for(;;)switch(t.prev=t.next){case 0:n=window.navigator.msPointerEnabled,i=w(e),t.prev=2,i.s();case 4:if((o=i.n()).done){t.next=17;break}if(a=o.value,!(n&&0===a.size||a.size%4096==0&&("."===a.name||"."===a.fileName))){t.next=8;break}return t.abrupt("continue",15);case 8:if(s=this.generateUniqueIdentifier(a),this.opts.allowDuplicateUploads||!this.getFromUniqueIdentifier(s)){t.next=11;break}return t.abrupt("continue",15);case 11:if(this.hook("filter-file",a,r)){t.next=13;break}return t.abrupt("continue",15);case 13:return t.next=15,[a,s];case 15:t.next=4;break;case 17:t.next=22;break;case 19:t.prev=19,t.t0=t.catch(2),i.e(t.t0);case 22:return t.prev=22,i.f(),t.finish(22);case 25:case"end":return t.stop()}}),t,this,[[2,19,22,25]])}))},{key:"addFile",value:function(t){for(var e=arguments.length,r=new Array(e>1?e-1:0),n=1;n<e;n++)r[n-1]=arguments[n];this.addFiles.apply(this,[[t]].concat(r))}},{key:"addFiles",value:function(t){var e=arguments.length>1&&void 0!==arguments[1]?arguments[1]:null,r=arguments.length>2&&void 0!==arguments[2]?arguments[2]:this.opts.initFileFn;this.hasHook(!0)&&console.warn("Using addFiles() while settings asynchronous events can lead to unpredictable results. Use asyncAddFiles() instead.");for(var n,i,o,a=[],s=this.filterFileList(t,e);(n=s.next())&&!n.done;){var u=g(n.value,2);i=u[0],o=u[1];var c=new Za(this,i,o);c.bootstrap(e,r),this.hook("file-added",c,e),this.aHook("file-added",c,e),c.file&&a.push(c)}this.hook("files-added",a,e),this.aHook("files-added",a,e);var l,f=w(a=a.filter((function(t){return t})));try{for(f.s();!(l=f.n()).done;)i=l.value,this.opts.singleFile&&this.files.length>0&&this.removeFile(this.files[0]),this.files.push(i)}catch(t){f.e(t)}finally{f.f()}this.hook("files-submitted",this.files,e),this.aHook("files-submitted",this.files,e)}},{key:"asyncAddFile",value:(i=r(regeneratorRuntime.mark((function t(e){var r,n,i,o=arguments;return regeneratorRuntime.wrap((function(t){for(;;)switch(t.prev=t.next){case 0:for(r=o.length,n=new Array(r>1?r-1:0),i=1;i<r;i++)n[i-1]=o[i];return t.next=3,this.asyncAddFiles.apply(this,[[e]].concat(n));case 3:return t.abrupt("return",t.sent[0]);case 4:case"end":return t.stop()}}),t,this)}))),function(t){return i.apply(this,arguments)})},{key:"asyncAddFiles",value:(e=r(regeneratorRuntime.mark((function t(e){var r,n,i,o,a,s,u,c,l,f,h,p,d,v,y,m,b,k=arguments;return regeneratorRuntime.wrap((function(t){for(;;)switch(t.prev=t.next){case 0:r=k.length>1&&void 0!==k[1]?k[1]:null,n=k.length>2&&void 0!==k[2]?k[2]:this.opts.initFileFn,s=[],u=this.filterFileList(e,r);case 4:if(!(i=u.next())||i.done){t.next=16;break}return c=g(i.value,2),o=c[0],a=c[1],t.next=10,this.aHook("filter-file",o,r);case 10:if(t.sent){t.next=12;break}return t.abrupt("continue",4);case 12:l=new Qa(this,o,a),f=l.bootstrap(r,n),s.push(f),t.next=4;break;case 16:return t.next=18,Promise.all(s);case 18:h=t.sent,p=w(h),t.prev=20,p.s();case 22:if((d=p.n()).done){t.next=29;break}return v=d.value,this.hook("file-added",v,r),t.next=27,this.aHook("file-added",v,r);case 27:t.next=22;break;case 29:t.next=34;break;case 31:t.prev=31,t.t0=t.catch(20),p.e(t.t0);case 34:return t.prev=34,p.f(),t.finish(34);case 37:return this.hook("files-added",h,r),t.next=40,this.aHook("files-added",h,r);case 40:h=h.filter((function(t){return t&&t.file})),y=w(h);try{for(y.s();!(m=y.n()).done;)b=m.value,this.opts.singleFile&&this.files.length>0&&this.removeFile(this.files[0]),this.files.push(b)}catch(t){y.e(t)}finally{y.f()}return this.hook("files-submitted",this.files,r),t.next=46,this.aHook("files-submitted",this.files,r);case 46:return t.abrupt("return",h);case 47:case"end":return t.stop()}}),t,this,[[20,31,34,37]])}))),function(t){return e.apply(this,arguments)})},{key:"removeFile",value:function(t){for(var e=this.files.length-1;e>=0;e--)this.files[e]===t&&(this.files.splice(e,1),t.abort(),this.emit("file-removed",t))}},{key:"getFromUniqueIdentifier",value:function(t){var e=!1;return oa(this.files,(function(r){r.uniqueIdentifier===t&&(e=r)})),e}},{key:"getSize",value:function(){var t=0;return oa(this.files,(function(e){t+=e.size})),t}},{key:"sizeUploaded",value:function(){var t=0;return oa(this.files,(function(e){t+=e.sizeUploaded()})),t}},{key:"timeRemaining",value:function(){var t=0,e=0;return oa(this.files,(function(r){r.paused||r.error||(t+=r.size-r.sizeUploaded(),e+=r.averageSpeed)})),t&&!e?Number.POSITIVE_INFINITY:t||e?Math.floor(t/e):0}}]),u}();export default ts;
+!function(e,t){"object"==typeof exports&&"undefined"!=typeof module?module.exports=t():"function"==typeof define&&define.amd?define(t):(e="undefined"!=typeof globalThis?globalThis:e||self).Flow=t()}(this,(function(){"use strict";const e=["file-added","files-added","files-submitted"],t=["filter-file"],s=["complete","error","file-error","file-progress","file-removed","file-retry","file-success","progress","upload-start"];EventTarget.prototype._addEventListener=EventTarget.prototype.addEventListener,EventTarget.prototype._removeEventListener=EventTarget.prototype.removeEventListener;class i extends EventTarget{constructor(e={}){super(),this._events={},this._hooks={};for(let[t,s]of Object.entries(e))for(let e of s)this.on(t,e)}isHook(t){return e.includes(t)||this.isFilter(t)}isFilter(e){return t.includes(e)}isEvent(e){return!this.isHook(e)}_camelToDashCase(e){return e.replace(/[A-Z]/g,(e=>`-${e.toLowerCase()}`))}on(i,r,n){var a=this._camelToDashCase(i);return a!=i&&(console.warn(`Flow.js v3: Do not rely on camel-case (${i}) event names.`),e.concat(t,s).includes(a)&&(i=a,console.info(`Using "${a}" instead.`))),this.isEvent(i)?this.addEventListener(i,r,n):this.addHook(i,r,n)}once(e,t,s){return this.isEvent(e)?this.addEventListener(e,t,{...s,once:!0}):console.warn("once() is not implemented for hooks.")}off(e,t,s){!this.isEvent(e)&&e||this.removeEventListener(e,t,s),this.isEvent(e)&&e||this.removeHook(e,t,s)}addEventListener(e,t,s=!1){let i=t,r=()=>{this.removeEventListener(e,t,s),i.apply(this,arguments)};return s&&s.once&&(t=r),this._addEventListener(e,t,s),this._events||(this._events={},Object.defineProperty(this,"_events",{enumerable:!1})),this._events[e]||(this._events[e]=[]),this._events[e].push({listener:t,useCapture:!0===s||s.capture||!1,passive:s&&s.passive||!1,once:s&&s.once||!1,type:e}),()=>{this.removeEventListener(e,t,s)}}removeEventListener(e,t=null,s=!1){if(t&&this._removeEventListener(e,t,s),this._events&&(!e||this._events[e]))if(e&&"*"!==e){for(const[i,r]of this._events[e].entries())if((!t||r.listener==t)&&r.useCapture==s){if(this._events[e].splice(i,1),t)break;this._removeEventListener(e,r.listener,r)}0==this._events[e].length&&delete this._events[e]}else for(let e of Object.keys(this._events))this.removeEventListener(e)}async emit(e,...t){this.dispatchEvent(new CustomEvent(e,{detail:t})),"catch-all"!=e&&this.emitCatchAll(e,...t)}async emitCatchAll(e,...t){this.dispatchEvent(new CustomEvent("catch-all",{detail:[e,...t]}))}addHook(e,t,s){var i=this._hooks;i.hasOwnProperty(e)||(i[e]=[]),i[e].push(t)}hasHook(e,t){t="string"==typeof t?[t]:t||[];var s=this._hooks;for(let[e,i]of Object.entries(s))if((!(t.length>0)||t.includes(e))&&i.length>0)return!0;return!1}removeHook(e,t,s){if(e&&"*"!=e)if(t){var i=this._hooks;i.hasOwnProperty(e)&&(r=i[e],n=t,(a=r.indexOf(n))>-1&&r.splice(a,1))}else delete this._hooks[e];else this._hooks={};var r,n,a}async hook(e,...t){let s,i=this._hooks[e]||[],r=this.isFilter(e);return i.length?(s=await Promise.all(i.map((e=>e.apply(this,t)))),r?s=s.includes(!0):"file-added"===e&&s.includes(!1)&&console.warn("In Flow.js 3.x, file-added event is an action rather than a filter. Return value is ignored but removing the `file` property allows to skip an enqueued file.")):s=!!r||t[0],this.emitCatchAll(e,...t),s}}function r(e,t,s,i,r){var n="slice";e.file.slice?n="slice":e.file.mozSlice?n="mozSlice":e.file.webkitSlice&&(n="webkitSlice"),r.readFinished(e.file[n](t,s,i))}function n(e,t){return"function"==typeof e&&(t=Array.prototype.slice.call(arguments),e=e.apply(null,t.slice(1))),e}function a(e,t,s){var i;if(e)if(void 0!==e.length){for(i=0;i<e.length;i++)if(!1===t.call(s,e[i],i))return}else for(i in e)if(e.hasOwnProperty(i)&&!1===t.call(s,e[i],i))return}("undefined"!=typeof window?window:"undefined"!=typeof global?global:"undefined"!=typeof self?self:{}).evalOpts=n;class o{constructor(){this.resolved=!1,this._promise=new Promise(((e,t)=>{this.resolve=()=>(this.resolved=!0,e()),this.reject=t})),this.then=this._promise.then.bind(this._promise),this.catch=this._promise.catch.bind(this._promise),this[Symbol.toStringTag]="Promise"}}class h{constructor(e,t,s){this.flowObj=e,this.fileObj=t,this.offset=s,this.tested=!1,this.retries=0,this.pendingRetry=!1,this.preprocessState=0,this.readState=0,this.payload=null,this.readBytes=-1,this.readStreamState=new o,this.loaded=0,this.total=0,this.chunkSize=this.fileObj.chunkSize,this.startByte=this.offset*this.chunkSize,this.filename=null,this.endByte=this.computeEndByte(),this.xhr=null}computeEndByte(){var e=Math.min(this.fileObj.size,(this.offset+1)*this.chunkSize);return this.fileObj.size-e<this.chunkSize&&!this.flowObj.opts.forceChunkSize&&(e=this.fileObj.size),e}event(e,t){(t=Array.prototype.slice.call(arguments)).unshift(this),this.fileObj.chunkEvent.apply(this.fileObj,t)}progressHandler(e){e.lengthComputable&&(this.loaded=e.loaded,this.total=e.total),this.event("progress",e)}testHandler(e){var t=this.status(!0);"error"===t?(this.event(t,this.message()),this.flowObj.uploadNextChunk()):"success"===t?(this.tested=!0,this.event(t,this.message()),this.flowObj.uploadNextChunk()):this.fileObj.paused||(this.tested=!0,this.send())}doneHandler(e){var t=this.status();if("success"===t||"error"===t)delete this.data,this.event(t,this.message()),this.flowObj.uploadNextChunk();else if(!this.fileObj.paused){this.event("retry",this.message()),this.pendingRetry=!0,this.abort(),this.retries++;var s=this.flowObj.opts.chunkRetryInterval;null!==s?setTimeout((()=>this.send()),s):this.send()}}getParams(){return{flowChunkNumber:this.offset+1,flowChunkSize:this.chunkSize,flowCurrentChunkSize:this.endByte-this.startByte,flowTotalSize:this.fileObj.size,flowIdentifier:this.fileObj.uniqueIdentifier,flowFilename:this.fileObj.name,flowRelativePath:this.fileObj.relativePath,flowTotalChunks:this.fileObj.chunks.length}}getTarget(e,t){return 0==t.length?e:(e.indexOf("?")<0?e+="?":e+="&",e+t.join("&"))}test(){this.xhr=new XMLHttpRequest,this.xhr.addEventListener("load",this.testHandler.bind(this),!1),this.xhr.addEventListener("error",this.testHandler.bind(this),!1);var e=n(this.flowObj.opts.testMethod,this.fileObj,this),t=this.prepareXhrRequest(e,!0);this.xhr.send(t)}async preprocessFinished(){this.endByte=this.computeEndByte(),this.preprocessState=2,await this.send()}readFinished(e){this.readState=2,this.payload=e,this.send()}async readStreamGuard(){var e=this.fileObj.chunks.map((e=>e.readStreamState)).slice(0,this.offset);try{await Promise.all(e)}catch(t){throw console.error(`Chunk ${this.offset}: Error while waiting for ${e.length} previous chunks being read.`),t}}async readStreamChunk(){if(this.readStreamState.resolved)return this.payload&&this.pendingRetry?(console.info(`Retrying chunk ${this.offset} upload`),this.uploadStreamChunk(this.payload)):(console.warn(`Chunk ${this.offset} already read. xhr initialized = ${this.xhr?1:0}. payload size = ${this.payload?this.payload.size:null}. readState = ${this.readState}. retry = ${this.pendingRetry}`),null);this.readState=1,await this.readStreamGuard();var e,t=this.flowObj.opts.asyncReadFileFn;return e=await t(this.fileObj,this.startByte,this.endByte,this.fileObj.file.type,this),this.readStreamState.resolve(),this.readState=2,e&&(this.readBytes=e.size||0===e.size?e.size:-1),this.uploadStreamChunk(e)}async uploadStreamChunk(e){if(e&&e.size>0)return this.fileObj.chunkSize&&e.size>this.fileObj.chunkSize&&console.warn(`Chunk ${this.offset}: returned too much data. Got ${e.size}. Expected not more than ${this.flowObj.chunkSize}.`),this.payload=e,void this.xhrSend(e);if(this.offset>0){var t=this.fileObj.chunks[this.offset-1].readBytes;if(t<parseInt(this.chunkSize))return console.warn(`Chunk ${this.offset} seems superfluous. No byte read() meanwhile previous chunk was only ${t} bytes instead of ${this.chunkSize}`),this.pendingRetry=!1,this.xhr={readyState:4,status:200,abort:e=>null},void this.doneHandler(null)}console.warn(`Chunk ${this.offset}: no byte to read()`),this.pendingRetry=!1}async send(){var e=this.flowObj.opts.preprocess,t=this.flowObj.opts.readFileFn,s=this.flowObj.opts.asyncReadFileFn;if("function"==typeof e)switch(this.preprocessState){case 0:return this.preprocessState=1,void e(this);case 1:return}if(s)await this.readStreamChunk();else{switch(this.readState){case 0:return this.readState=1,void t(this.fileObj,this.startByte,this.endByte,this.fileObj.file.type,this);case 1:return}this.xhrSend(this.payload)}}xhrSend(e){if(!this.flowObj.opts.testChunks||this.tested){this.loaded=0,this.total=0,this.pendingRetry=!1,this.xhr=new XMLHttpRequest,this.xhr.upload.addEventListener("progress",this.progressHandler.bind(this),!1),this.xhr.addEventListener("load",this.doneHandler.bind(this),!1),this.xhr.addEventListener("error",this.doneHandler.bind(this),!1);var t=n(this.flowObj.opts.uploadMethod,this.fileObj,this),s=this.prepareXhrRequest(t,!1,this.flowObj.opts.method,e),i=this.flowObj.opts.changeRawDataBeforeSend;"function"==typeof i&&(s=i(this,s)),this.xhr.send(s)}else this.test()}abort(){this.xhr&&this.xhr.abort(),this.xhr=null}status(e){return 1===this.readState?"reading":1===this.preprocessState?"uploading":!this.xhr||this.pendingRetry?"pending":this.xhr.readyState<4?"uploading":this.flowObj.opts.successStatuses.indexOf(this.xhr.status)>-1?"success":this.flowObj.opts.permanentErrors.indexOf(this.xhr.status)>-1||!e&&this.retries>=this.flowObj.opts.maxChunkRetries?"error":(this.abort(),"pending")}message(){return this.xhr?this.xhr.responseText:""}progress(){if(this.pendingRetry)return 0;var e=this.status();return"success"===e||"error"===e?1:"pending"===e?0:this.total>0?this.loaded/this.total:0}sizeUploaded(){var e=this.endByte-this.startByte;return"success"!==this.status()&&(e=this.progress()*e),e}prepareXhrRequest(e,t,s,i){var r=n(this.flowObj.opts.query,this.fileObj,this,t);r=Object.assign({},r||{},this.getParams());var o=n(this.flowObj.opts.target,this.fileObj,this,t),h=null;if("GET"===e||"octet"===s){var l=[];a(r,(function(e,t){l.push([encodeURIComponent(t),encodeURIComponent(e)].join("="))})),o=this.getTarget(o,l),h=i||null}else h=new FormData,a(r,(function(e,t){h.append(t,e)})),void 0!==i&&h.append(this.flowObj.opts.fileParameterName,i,this.filename||this.fileObj.file.name);return this.xhr.open(e,o,!0),this.xhr.withCredentials=this.flowObj.opts.withCredentials,a(n(this.flowObj.opts.headers,this.fileObj,this,t),(function(e,t){this.xhr.setRequestHeader(t,e)}),this),h}}class l{constructor(e,t,s){this.flowObj=e,this.file=t,this.name=t.fileName||t.name,this.size=t.size,this.relativePath=t.relativePath||t.webkitRelativePath||this.name,this.uniqueIdentifier=void 0===s?e.generateUniqueIdentifier(t):s,this.chunkSize=0,this.chunks=[],this.paused=!1,this.error=!1,this.averageSpeed=0,this.currentSpeed=0,this._lastProgressCallback=Date.now(),this._prevUploadedSize=0,this._prevProgress=0}measureSpeed(){var e=Date.now()-this._lastProgressCallback;if(e){var t=this.flowObj.opts.speedSmoothingFactor,s=this.sizeUploaded();this.currentSpeed=Math.max((s-this._prevUploadedSize)/e*1e3,0),this.averageSpeed=t*this.currentSpeed+(1-t)*this.averageSpeed,this._prevUploadedSize=s}}chunkEvent(e,t,s){switch(t){case"progress":if(Date.now()-this._lastProgressCallback<this.flowObj.opts.progressCallbacksInterval)break;this.measureSpeed(),this.flowObj.emit("file-progress",this,e),this.flowObj.emit("progress"),this._lastProgressCallback=Date.now();break;case"error":this.error=!0,this.abort(!0),this.flowObj.emit("file-error",this,s,e),this.flowObj.emit("error",s,this,e);break;case"success":if(this.error)return;this.measureSpeed(),this.flowObj.emit("file-progress",this,e),this.flowObj.emit("progress"),this._lastProgressCallback=Date.now(),this.isComplete()&&(this.currentSpeed=0,this.averageSpeed=0,this.flowObj.emit("file-success",this,s,e));break;case"retry":this.flowObj.emit("file-retry",this,e)}}pause(){this.paused=!0,this.abort()}resume(){this.paused=!1,this.flowObj.upload()}abort(e){this.currentSpeed=0,this.averageSpeed=0,e&&(this.chunks=[]);for(let e of this.chunks)"uploading"===e.status()&&(e.abort(),e.pendingRetry=!0,this.flowObj.uploadNextChunk())}cancel(){this.flowObj.removeFile(this)}retry(){this.bootstrap("retry"),this.flowObj.upload()}bootstrap(e=null,t=this.flowObj.opts.initFileFn){"function"==typeof t&&t(this),this._bootstrap()}_bootstrap(){this.abort(!0),this.error=!1,this._prevProgress=0;var e=this.flowObj.opts.forceChunkSize?Math.ceil:Math.floor;this.chunkSize=n(this.flowObj.opts.chunkSize,this);for(var t=Math.max(e(this.size/this.chunkSize),1),s=0;s<t;s++)this.chunks.push(new h(this.flowObj,this,s))}progress(){if(this.error)return 1;if(1===this.chunks.length)return this._prevProgress=Math.max(this._prevProgress,this.chunks[0].progress()),this._prevProgress;var e=0;a(this.chunks,(function(t){e+=t.progress()*(t.endByte-t.startByte)}));var t=e/this.size;return this._prevProgress=Math.max(this._prevProgress,t>.9999?1:t),this._prevProgress}isUploading(){var e=!1;return a(this.chunks,(function(t){if("uploading"===t.status())return e=!0,!1})),e}isComplete(){var e=!1;return a(this.chunks,(function(t){var s=t.status();if("pending"===s||"uploading"===s||"reading"===s||1===t.preprocessState||1===t.readState)return e=!0,!1})),!e}sizeUploaded(){var e=0;return a(this.chunks,(function(t){e+=t.sizeUploaded()})),e}timeRemaining(){if(this.paused||this.error)return 0;var e=this.size-this.sizeUploaded();return e&&!this.averageSpeed?Number.POSITIVE_INFINITY:e||this.averageSpeed?Math.floor(e/this.averageSpeed):0}getType(){return this.file.type&&this.file.type.split("/")[1]}getExtension(){return this.name.substr(2+(~-this.name.lastIndexOf(".")>>>0)).toLowerCase()}}("undefined"!=typeof window?window:"undefined"!=typeof global?global:"undefined"!=typeof self?self:{}).FlowFile=l;class d extends l{async retry(){return await this.bootstrap("retry"),await this.flowObj.upload()}async bootstrap(e=null,t=this.flowObj.opts.initFileFn){return"function"==typeof t&&await t(this,e),this._bootstrap(),this}isReading(){for(let e of this.chunks)if("reading"===e.status())return!0;return!1}}
+/**
+   * @license MIT
+   */class u extends i{constructor(e,t){super(t),u.version="3.0.0-alpha.0",this.supportDirectory=/Chrome/.test(window.navigator.userAgent)||/Firefox/.test(window.navigator.userAgent)||/Edge/.test(window.navigator.userAgent),this.files=[],this.defaults={chunkSize:1048576,forceChunkSize:!1,simultaneousUploads:3,singleFile:!1,fileParameterName:"file",progressCallbacksInterval:500,speedSmoothingFactor:.1,query:{},headers:{},withCredentials:!1,preprocess:null,changeRawDataBeforeSend:null,method:"multipart",testMethod:"GET",uploadMethod:"POST",prioritizeFirstAndLastChunk:!1,allowDuplicateUploads:!1,target:"/",testChunks:!0,generateUniqueIdentifier:null,maxChunkRetries:0,chunkRetryInterval:null,permanentErrors:[404,413,415,500,501],successStatuses:[200,201,202],onDropStopPropagation:!1,initFileFn:null,readFileFn:r,asyncReadFileFn:null},this.opts={},this.opts=Object.assign({},this.defaults,e||{}),this._onDropBound=null}onDrop(e){this.opts.onDropStopPropagation&&e.stopPropagation(),e.preventDefault();var t=e.dataTransfer;t.items&&t.items[0]&&t.items[0].webkitGetAsEntry?this.webkitReadDataTransfer(e):this.addFiles(t.files,e)}preventEvent(e){e.preventDefault()}webkitReadDataTransfer(e){var t=e.dataTransfer.items.length,s=()=>{0==--t&&this.addFiles(i,e)},i=[];for(let t of e.dataTransfer.items){var r=t.webkitGetAsEntry();if(!r)return void s();r.isFile?a(t.getAsFile(),r.fullPath):n(r.createReader())}function n(e){e.readEntries((i=>{if(i.length){t+=i.length;var r={};for(let e of i)e.isFile?(r[e.name]=e.fullPath,e.file((e=>a(e,r[e.name])),o)):e.isDirectory&&n(e.createReader());n(e)}else s()}),o)}function a(e,t){e.relativePath=t.substring(1),i.push(e),s()}function o(e){throw s(),e}}async generateUniqueIdentifier(e){var t=this.opts.generateUniqueIdentifier;if("function"==typeof t)return await t(e);var s=e.relativePath||e.webkitRelativePath||e.fileName||e.name;return e.size+"-"+s.replace(/[^0-9a-zA-Z_-]/gim,"")}async uploadNextChunk(e){var t=!1;if(this.opts.prioritizeFirstAndLastChunk){for(let e of this.files){if(!e.paused&&e.chunks.length&&"pending"===e.chunks[0].status()){await e.chunks[0].send(),t=!0;break}if(!e.paused&&e.chunks.length>1&&"pending"===e.chunks[e.chunks.length-1].status()){await e.chunks[e.chunks.length-1].send(),t=!0;break}}if(t)return t}e:for(let e of this.files)if(!e.paused)for(let s of e.chunks)if("pending"===s.status()){await s.send(),t=!0;break e}if(t)return!0;var s=!1;for(let e of this.files)if(!e.isComplete()){s=!0;break}return s||e||this.emit("complete"),!1}async assignBrowse(e,t,s,i){e instanceof Element&&(e=[e]),a(e,(function(e){var r;"INPUT"===e.tagName&&"file"===e.type?r=e:((r=document.createElement("input")).setAttribute("type","file"),Object.assign(r.style,{visibility:"hidden",position:"absolute",width:"1px",height:"1px"}),e.appendChild(r),e.addEventListener("click",(function(){r.click()}),!1)),this.opts.singleFile||s||r.setAttribute("multiple","multiple"),t&&r.setAttribute("webkitdirectory","webkitdirectory"),a(i,(function(e,t){r.setAttribute(t,e)})),r.addEventListener("change",(async e=>{e.target.value&&(await this.addFiles(e.target.files,e),e.target.value="")}),!1)}),this)}assignDrop(e){void 0===e.length&&(e=[e]),this._onDropBound=this.onDrop.bind(this);for(let t of e)t.addEventListener("dragover",this.preventEvent,!1),t.addEventListener("dragenter",this.preventEvent,!1),t.addEventListener("drop",this._onDropBound,!1)}unAssignDrop(e){void 0===e.length&&(e=[e]);for(let t of e)t.removeEventListener("dragover",this.preventEvent,!1),t.removeEventListener("dragenter",this.preventEvent,!1),t.removeEventListener("drop",this._onDropBound,!1)}isUploading(){var e=!1;return a(this.files,(function(t){if(t.isUploading())return e=!0,!1})),e}_shouldUploadNext(){var e=0,t=!0,s=this.opts.simultaneousUploads;return a(this.files,(function(i){a(i.chunks,(function(i){if("uploading"===i.status()&&++e>=s)return t=!1,!1}))})),t&&e}async upload(){var e=this._shouldUploadNext();if(!1!==e){this.emit("upload-start");for(var t=!1,s=1;s<=this.opts.simultaneousUploads-e;s++)t=await this.uploadNextChunk(!0)||t;t||this.emit("complete")}}resume(){a(this.files,(function(e){e.isComplete()||e.resume()}))}pause(){a(this.files,(function(e){e.pause()}))}cancel(){for(var e=this.files.length-1;e>=0;e--)this.files[e].cancel()}progress(){var e=0,t=0;return a(this.files,(function(s){e+=s.progress()*s.size,t+=s.size})),t>0?e/t:0}async addFile(e,...t){return(await this.addFiles([e],...t))[0]}async addFiles(e,t=null,s=this.opts.initFileFn){let i=[];const r=window.navigator.msPointerEnabled;for(let a of e){if(r&&0===a.size||a.size%4096==0&&("."===a.name||"."===a.fileName))continue;var n=await this.generateUniqueIdentifier(a);if(!this.opts.allowDuplicateUploads&&this.getFromUniqueIdentifier(n))continue;if(!await this.hook("filter-file",a,t))continue;let e=new d(this,a,n).bootstrap(t,s);i.push(e)}let a=await Promise.all(i);for(let e of a)await this.hook("file-added",e,t);a=a.filter((e=>e&&e.file)),await this.hook("files-added",a,t),a=a.filter((e=>e&&e.file));for(let e of a)this.opts.singleFile&&this.files.length>0&&this.removeFile(this.files[0]),this.files.push(e);return await this.hook("files-submitted",this.files,t),a}removeFile(e){for(var t=this.files.length-1;t>=0;t--)if(this.files[t]===e){this.files.splice(t,1),e.abort(),this.emit("file-removed",e);break}}getFromUniqueIdentifier(e){var t=!1;return a(this.files,(function(s){s.uniqueIdentifier===e&&(t=s)})),t}getSize(){var e=0;return a(this.files,(function(t){e+=t.size})),e}sizeUploaded(){var e=0;return a(this.files,(function(t){e+=t.sizeUploaded()})),e}timeRemaining(){var e=0,t=0;return a(this.files,(function(s){s.paused||s.error||(e+=s.size-s.sizeUploaded(),t+=s.averageSpeed)})),e&&!t?Number.POSITIVE_INFINITY:e||t?Math.floor(e/t):0}}return u}));
 //# sourceMappingURL=flow.min.js.map
diff --git a/rollup.config.js b/rollup.config.js
index 9f15b3e..44503c9 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -7,49 +7,59 @@ import resolve from '@rollup/plugin-node-resolve';
 import strip from '@rollup/plugin-strip';
 import { terser } from "rollup-plugin-terser";
 
-let plugins = [
-    resolve(),
-    commonjs(),
-    replace({
-        "<%= version %>": `'${pkg.version}'`,
-        delimiters: ["'", "'"]
-    }),
+const babelPlugin = babel({
+  babelHelpers: 'bundled'
+});
 
-    babel({ babelHelpers: 'bundled' })
-];
-
-export default [
-    {
-        input: 'src/Flow.js',
-        plugins,
-        output: {
-            name: 'Flow',
-            file: pkg.browser,
-            sourcemap: true,
-            format: 'umd',
-	},
-    },
-    {
-        input: 'src/Flow.js',
-        plugins: plugins.concat([strip({functions:['console.(log|debug)','debug','alert']}), terser()]),
-        output: {
-            name: 'Flow',
-            banner: `/*! ${pkg.name} ${pkg.version} */\n`,
-            file: pkg.browser.replace(/js$/, 'min.js'),
-            sourcemap: true,
-            format: 'esm',
-	},
-    },
-    {
-        input: 'src/Flow.js',
-        plugins: plugins.concat([istanbul({exclude: ['node_modules/**/*.js']})]),
-        output: {
-            name: 'Flow',
-            banner: `/*! ${pkg.name} ${pkg.version} */\n`,
-            file: pkg.browser.replace(/js$/, 'cov.js'),
-            sourcemap: true,
-            format: 'umd',
-	},
-    }
+const stripPlugin = strip({
+  functions: ['console.(log|debug)', 'debug', 'alert']
+});
 
+const plugins = [
+  resolve(),
+  commonjs(),
+  replace({
+    "<%= version %>": `'${pkg.version}'`,
+    delimiters: ["'", "'"]
+  })
 ];
+
+export default [{
+  input: 'src/Flow.js',
+  plugins,
+  output: {
+    name: 'Flow',
+    file: pkg.browser,
+    sourcemap: true,
+    format: 'umd'
+  }
+}, {
+  input: 'src/Flow.js',
+  plugins: plugins.concat(stripPlugin, terser()),
+  output: {
+    name: 'Flow',
+    file: pkg.browser.replace(/js$/, 'min.js'),
+    sourcemap: true,
+    format: 'umd'
+  }
+}, {
+  input: 'src/Flow.js',
+  plugins: plugins.concat(babelPlugin, stripPlugin, terser()),
+  output: {
+    name: 'Flow',
+    banner: `/*! ${pkg.name} ${pkg.version} */\n`,
+    file: pkg.browser.replace(/js$/, 'compat.min.js'),
+    sourcemap: true,
+    format: 'umd'
+  }
+}, {
+  input: 'src/Flow.js',
+  plugins: plugins.concat(babelPlugin, istanbul({ exclude: ['node_modules/**/*.js'] })),
+  output: {
+    name: 'Flow',
+    banner: `/*! ${pkg.name} ${pkg.version} */\n`,
+    file: pkg.browser.replace(/js$/, 'cov.js'),
+    sourcemap: true,
+    format: 'umd'
+  }
+}];
diff --git a/src/AsyncFlowFile.js b/src/AsyncFlowFile.js
index c6dc6b4..9f021b3 100644
--- a/src/AsyncFlowFile.js
+++ b/src/AsyncFlowFile.js
@@ -12,7 +12,7 @@ export default class AsyncFlowFile extends FlowFile {
    */
   async retry() {
     await this.bootstrap('retry');
-    return this.flowObj.upload();
+    return await this.flowObj.upload();
   }
 
   async bootstrap(event = null, initFileFn = this.flowObj.opts.initFileFn) {
@@ -26,9 +26,6 @@ export default class AsyncFlowFile extends FlowFile {
     }
 
     this._bootstrap();
-    if (event !== 'retry') {
-      this.flowObj.hook('file-added', this, event);
-    }
 
     // console.log("Flowfile returns [async]", this._bootstrapped);
     return this;
diff --git a/src/Eventizer.js b/src/Eventizer.js
index a0ec196..e1e8998 100644
--- a/src/Eventizer.js
+++ b/src/Eventizer.js
@@ -5,7 +5,7 @@
 /**
  * Hooks exist to allow users to alter flow.js file processing. This is intended for users relying on a dropzone and other higher-level components
  * when the flow between `addFiles()` and `upload()` is hardly configurable.
- * Users calling `await flow.asyncAddFiles()` have more room for customization before calling `upload();` without having to rely upon hooks.
+ * Users calling `await flow.addFiles()` have more room for customization before calling `upload();` without having to rely upon hooks.
  *
  * Hooks can *alter* the parameters they receive (javascript pass-by-reference rules will apply).
  * For example, the `file-added` hook receives a `flowfile` parameter. `delete flowfile` or `flowfile = {}` have no effect
@@ -49,20 +49,18 @@ const EVENTS = [
  * This class:
  * - add EventListener support to an object.
  * - wrap EventListener attachment in order to ease their removal
- * - add the concept of processing hooks similar to native events (explained below) 
+ * - add the concept of processing hooks similar to native events (explained below)
  *
  * The file is organized in three parts:
  * 1. isHook, isFilter, isEvent, on, off
- *    wrap the above concept and offer an unified interface. Whether a callback
- *    apply to a hook or an event is determined by its name (and the "async" nature of
- *    the callback).
+ *    wrap the above concept and offer a unified interface. Whether a callback
+ *    apply to a hook or an event is determined by its name.
  *
  * 2. Events: addEventListener, removeEventListener and *emit()*
  *    apply to addition/removal/dispatching of *events*.
  *
  * 3. Hooks: addHook, hasHook, removeHook apply to addition/removal of *hooks*.
  *    - *hook()* trigger the hook execution.
- *    - *aHook()* is the async counterpart.
  */
 
 EventTarget.prototype._addEventListener = EventTarget.prototype.addEventListener;
@@ -77,8 +75,7 @@ export default class extends EventTarget {
    *
    * Each key is check against an hardcoded to list to defined whether:
    * - it's a "native" CustomEvent (dispatched asynchronously dirsregarding its value)
-   * - it's a known event (whether a "filter" or an "action", and in this case, whether
-   *   each callback is asynchronous or not.
+   * - it's a known event (whether a "filter" or an "action")
    * @type {}
    */
   constructor(hooks_events = {}) {
@@ -86,7 +83,6 @@ export default class extends EventTarget {
 
     this._events = {};
     this._hooks = {};
-    this._asyncHooks = {};
 
     /**
      * Hooks and events are distinguished based on the name.
@@ -219,11 +215,11 @@ export default class extends EventTarget {
     for (const [i, v] of this._events[event].entries()) {
       if ((!callback || v.listener == callback) && v.useCapture == options) {
         // console.log(`[event] Removed one callback from "${event}"`);
-	this._events[event].splice(i, 1);
+        this._events[event].splice(i, 1);
         if (! callback) {
           this._removeEventListener(event, v.listener, v);
         } else {
-	  break;
+          break;
         }
       }
     }
@@ -252,8 +248,7 @@ export default class extends EventTarget {
    * ### HOOKS ###
    */
   addHook(event, callback, options) {
-    var isAsync = callback.constructor.name === 'AsyncFunction',
-        target = isAsync ? this._asyncHooks : this._hooks;
+    var target = this._hooks;
     if (!target.hasOwnProperty(event)) {
       target[event] = [];
     }
@@ -262,7 +257,7 @@ export default class extends EventTarget {
 
   hasHook(async, events) {
     events = typeof events === 'string' ? [events] : events || [];
-    var target = async ? this._asyncHooks : this._hooks;
+    var target = this._hooks;
     for (let [k, v] of Object.entries(target)) {
       if (events.length > 0 && ! events.includes(k)) {
         continue;
@@ -288,76 +283,47 @@ export default class extends EventTarget {
 
     if (event && event != '*') {
       if (callback) {
-        var isAsync = callback.constructor.name === 'AsyncFunction',
-            target = isAsync ? this._asyncHooks : this._hooks;
+        var target = this._hooks;
         if (target.hasOwnProperty(event)) {
           arrayRemove(target[event], callback);
         }
       } else {
         delete this._hooks[event];
-        delete this._asyncHooks[event];
       }
     } else {
       this._hooks = {};
-      this._asyncHooks = {};
     }
   }
 
   /**
-   * Run a synchronous hook (action or filter).
+   * Run an asynchronous hook (action or filter).
    *
    * @param {string} event event name
    * @param {...} args arguments of a callback
    *
    * @return {bool} In the case of *filters*, indicates whether processing must continue.
-   * @return null   In the case of *actions*.
+   * @return {mixed} In the case of *actions*: The first argument (possibly modified by hooks).
    */
-  hook(name, ...args) {
-    let value,
-        preventDefault = false,
+  async hook(name, ...args) {
+    let calls = this._hooks[name] || [],
         isFilter = this.isFilter(name),
-        callbacks = this._hooks[name] || [];
+        returns;
 
-    for (let callback of callbacks) {
-      // console.log(`[event] Fire hook "${name}"${args.length ? ' with ' + args.length + ' arguments' : ''}`);
-      value = callback.apply(this, args);
-      if (name === 'file-added' && value === false) {
-        console.warn('In Flow.js 3.x, file-added event is an action rather than a fitler. return value is ignored but removing the `file` property allows to skip an enqueued file.');
-      }
+    if (calls.length) {
+      // console.log(`[event] Fire ${calls.length} async hook for "${name}"${args.length ? ' with ' + args.length + ' arguments' : ''}`);
+      returns = await Promise.all(calls.map(e => e.apply(this, args)));
 
       if (isFilter) {
-        // console.log(`[filter-event] ${event} returned:`, item.value);
-        preventDefault |= (value === false);
-      } else {
-        // Changes happen by reference. We ignore iterator.next().value.
+        returns = returns.includes(true);
+      } else if (name === 'file-added' && returns.includes(false)) {
+        console.warn('In Flow.js 3.x, file-added event is an action rather than a filter. Return value is ignored but removing the `file` property allows to skip an enqueued file.');
       }
+    } else {
+      returns = isFilter ? true : args[0];
     }
 
     this.emitCatchAll(name, ...args);
-    return isFilter ? !preventDefault : null;
-  }
-
-  /**
-   * Run an asynchronous hook (action or filter).
-   *
-   * @param {string} event event name
-   * @param {...} args arguments of a callback
-   *
-   * @return {bool} In the case of *filters*, indicates whether processing must continue.
-   * @return {mixed} In the case of *actions*: The first argument (possibly modified by hooks).
-   */
-  async aHook(name, ...args) {
-    let calls = this._asyncHooks[name] || [],
-        isFilter = this.isFilter(name);
-
-    if (! calls.length) {
-      return isFilter ? true : args[0];
-    }
 
-    // console.log(`[event] Fire ${calls.length} async hook for "${name}"${args.length ? ' with ' + args.length + ' arguments' : ''}`);
-    var returns = await Promise.all(calls.map(e => e.apply(this, args)));
-
-    this.emitCatchAll(name, ...args);
-    return isFilter ? returns.include(false) : returns;
+    return returns;
   }
 }
diff --git a/src/Flow.js b/src/Flow.js
index 9022713..8ca0c08 100644
--- a/src/Flow.js
+++ b/src/Flow.js
@@ -142,25 +142,6 @@ export default class Flow extends Eventizer {
     }
   }
 
-  /**
-   * On drop event when file/stream initialization is asynchronous
-   * @function
-   * @param {MouseEvent} event
-   */
-  async asyncOnDrop(event) {
-    if (this.opts.onDropStopPropagation) {
-      event.stopPropagation();
-    }
-    event.preventDefault();
-    var dataTransfer = event.dataTransfer;
-    if (dataTransfer.items && dataTransfer.items[0] &&
-        dataTransfer.items[0].webkitGetAsEntry) {
-      this.webkitReadDataTransfer(event);
-    } else {
-      await this.asyncAddFiles(dataTransfer.files, event);
-    }
-  }
-
   /**
    * Prevent default
    * @function
@@ -234,10 +215,10 @@ export default class Flow extends Eventizer {
    * @param {FlowFile} file
    * @returns {string}
    */
-  generateUniqueIdentifier(file) {
+  async generateUniqueIdentifier(file) {
     var custom = this.opts.generateUniqueIdentifier;
     if (typeof custom === 'function') {
-      return custom(file);
+      return await custom(file);
     }
     // Some confusion in different versions of Firefox
     var relativePath = file.relativePath || file.webkitRelativePath || file.fileName || file.name;
@@ -250,7 +231,7 @@ export default class Flow extends Eventizer {
    * @returns {boolean}
    * @private
    */
-  uploadNextChunk(preventEvents) {
+  async uploadNextChunk(preventEvents) {
     // In some cases (such as videos) it's really handy to upload the first
     // and last chunk of a file quickly; this let's the server check the file's
     // metadata and determine if there's even a point in continuing.
@@ -259,13 +240,13 @@ export default class Flow extends Eventizer {
       for (let file of this.files) {
         if (!file.paused && file.chunks.length &&
             file.chunks[0].status() === 'pending') {
-          file.chunks[0].send();
+          await file.chunks[0].send();
           found = true;
           break;
         }
         if (!file.paused && file.chunks.length > 1 &&
             file.chunks[file.chunks.length - 1].status() === 'pending') {
-          file.chunks[file.chunks.length - 1].send();
+          await file.chunks[file.chunks.length - 1].send();
           found = true;
           break;
         }
@@ -283,7 +264,7 @@ export default class Flow extends Eventizer {
       }
       for (let chunk of file.chunks) {
         if (chunk.status() === 'pending') {
-          chunk.send();
+          await chunk.send();
           found = true;
           break outer_loop;
         }
@@ -321,7 +302,7 @@ export default class Flow extends Eventizer {
    *  eg: accept: 'image/*'
    * be selected (Chrome only).
    */
-  assignBrowse(domNodes, isDirectory, singleFile, attributes) {
+  async assignBrowse(domNodes, isDirectory, singleFile, attributes) {
     if (domNodes instanceof Element) {
       domNodes = [domNodes];
     }
@@ -360,25 +341,12 @@ export default class Flow extends Eventizer {
         input.setAttribute(key, value);
       });
       // When new files are added, simply append them to the overall list
-      // but adapt to the case where initFileFn is async.
-      var callback = this.opts.initFileFn
-          && typeof this.opts.initFileFn === 'function'
-          && this.opts.initFileFn.constructor.name  === 'AsyncFunction'
-          ? async e => {
-            if (e.target.value) {
-              input.setAttribute('readonly', 'readonly');
-              await this.asyncAddFiles(e.target.files, e);
-              e.target.value = '';
-              input.removeAttribute('readonly');
-            }
-          }
-          : e => {
-            if (e.target.value) {
-              this.addFiles(e.target.files, e);
-              e.target.value = '';
-            }
-          };
-      input.addEventListener('change', callback, false);
+      input.addEventListener('change', async e => {
+        if (e.target.value) {
+          await this.addFiles(e.target.files, e);
+          e.target.value = '';
+        }
+      }, false);
     }, this);
   }
 
@@ -392,11 +360,7 @@ export default class Flow extends Eventizer {
       domNodes = [domNodes];
     }
 
-    this._onDropBound = this.opts.initFileFn
-          && typeof this.opts.initFileFn === 'function'
-          && this.opts.initFileFn.constructor.name  === 'AsyncFunction'
-          ? this.asyncOnDrop.bind(this)
-          : this.onDrop.bind(this);
+    this._onDropBound = this.onDrop.bind(this);
     for (let domNode of domNodes) {
       domNode.addEventListener('dragover', this.preventEvent, false);
       domNode.addEventListener('dragenter', this.preventEvent, false);
@@ -466,7 +430,7 @@ export default class Flow extends Eventizer {
    * Start or resume uploading.
    * @function
    */
-  upload() {
+  async upload() {
     // Make sure we don't start too many uploads at once
     var ret = this._shouldUploadNext();
     if (ret === false) {
@@ -476,7 +440,7 @@ export default class Flow extends Eventizer {
     this.emit('upload-start');
     var started = false;
     for (var num = 1; num <= this.opts.simultaneousUploads - ret; num++) {
-      started = this.uploadNextChunk(true) || started;
+      started = await this.uploadNextChunk(true) || started;
     }
     if (!started) {
       this.emit('complete');
@@ -532,44 +496,16 @@ export default class Flow extends Eventizer {
     return totalSize > 0 ? totalDone / totalSize : 0;
   }
 
-  /**
-   * A generator to yield files and factor the sync part of the filtering logic used by both
-   * addFiles & asyncAddFiles
-   */
-  *filterFileList(fileList, event) {
-    // ie10+
-    var ie10plus = window.navigator.msPointerEnabled;
-
-    for (let file of fileList) {
-      // https://github.com/flowjs/flow.js/issues/55
-      if ((ie10plus && file.size === 0) || (file.size % 4096 === 0 && (file.name === '.' || file.fileName === '.'))) {
-        // console.log(`file ${file.name} empty. skipping`);
-        continue;
-      }
-
-      var uniqueIdentifier = this.generateUniqueIdentifier(file);
-      if (!this.opts.allowDuplicateUploads && this.getFromUniqueIdentifier(uniqueIdentifier)) {
-        // console.log(`file ${file.name} non-unique. skipping`);
-        continue;
-      }
-
-      if (! this.hook('filter-file', file, event)) {
-        // console.log(`file ${file.name} filtered-out. skipping`);
-        continue;
-      }
-
-      yield [file, uniqueIdentifier];
-    }
-  }
-
   /**
    * Add a HTML5 File object to the list of files.
    * @function
    * @param {File} file
-   * @param Any other parameters supported by addFiles
+   * @param Any other parameters supported by addFiles.
+   *
+   * @return (async) An initialized <AsyncFlowFile>.
    */
-  addFile(file, ...args) {
-    this.addFiles([file], ...args);
+  async addFile(file, ...args) {
+    return (await this.addFiles([file], ...args))[0];
   }
 
   /**
@@ -577,102 +513,63 @@ export default class Flow extends Eventizer {
    * @function
    * @param {FileList|Array} fileList
    * @param {Event} [event] event is optional
+   *
+   * @return Promise{[<AsyncFlowFile>,...]} The promise of getting an array of AsyncFlowFile.
    */
-  addFiles(fileList, event = null, initFileFn = this.opts.initFileFn) {
-    if (this.hasHook(true)) {
-      console.warn('Using addFiles() while settings asynchronous events can lead to unpredictable results. Use asyncAddFiles() instead.');
-    }
+  async addFiles(fileList, event = null, initFileFn = this.opts.initFileFn) {
+    let states = [];
 
-    let item, file, flowfile, uniqueIdentifier, files = [];
-    const iterator = this.filterFileList(fileList, event);
-    while ((item = iterator.next()) && !item.done) {
-      [file, uniqueIdentifier] = item.value;
+    const ie10plus = window.navigator.msPointerEnabled;
 
-      var f = new FlowFile(this, file, uniqueIdentifier);
-      f.bootstrap(event, initFileFn);
-      this.hook('file-added', f, event);
-      this.aHook('file-added', f, event);
-      if (! f.file) {
+    for (let file of fileList) {
+      // https://github.com/flowjs/flow.js/issues/55
+      if ((ie10plus && file.size === 0) || (file.size % 4096 === 0 && (file.name === '.' || file.fileName === '.'))) {
+        // console.log(`file ${file.name} empty. skipping`);
         continue;
       }
-      files.push(f);
-    }
 
-    this.hook('files-added', files, event);
-    this.aHook('files-added', files, event);
-
-    files = files.filter(e => e);
-    for (file of files) {
-      if (this.opts.singleFile && this.files.length > 0) {
-        this.removeFile(this.files[0]);
+      var uniqueIdentifier = await this.generateUniqueIdentifier(file);
+      if (!this.opts.allowDuplicateUploads && this.getFromUniqueIdentifier(uniqueIdentifier)) {
+        // console.log(`file ${file.name} non-unique. skipping`);
+        continue;
       }
-      this.files.push(file);
-      // console.log(`enqueue file ${file.name} of ${file.chunks.length} chunks`);
-    }
-
-    this.hook('files-submitted', this.files, event);
-    this.aHook('files-submitted', this.files, event);
-  }
-
-
-  /**
-   * Add a HTML5 File object to the list of files.
-   * @function
-   * @param {File} file
-   * @param Any other parameters supported by asyncAddFiles.
-   *
-   * @return (async) An initialized <AsyncFlowFile>.
-   */
-  async asyncAddFile(file, ...args) {
-    return (await this.asyncAddFiles([file], ...args))[0];
-  }
 
-  /**
-   * Add a HTML5 File object to the list of files.
-   * @function
-   * @param {FileList|Array} fileList
-   * @param {Event} [event] event is optional
-   *
-   * @return Promise{[<AsyncFlowFile>,...]} The promise of getting an array of AsyncFlowFile.
-   */
-  async asyncAddFiles(fileList, event = null, initFileFn = this.opts.initFileFn) {
-    let item, file, flowfile, uniqueIdentifier, states = [];
-    const iterator = this.filterFileList(fileList, event);
-
-    while ((item = iterator.next()) && !item.done) {
-      [file, uniqueIdentifier] = item.value;
-      if (! await this.aHook('filter-file', file, event)) {
+      if (! await this.hook('filter-file', file, event)) {
         // console.log(`file ${file.name} filtered-out. skipping`);
         continue;
       }
 
-      // ToDo: parallelizable ?
-      var flowFile = new AsyncFlowFile(this, file, uniqueIdentifier),
-          state = flowFile.bootstrap(event, initFileFn);
+      let flowFile = new AsyncFlowFile(this, file, uniqueIdentifier);
+
+      let state = flowFile.bootstrap(event, initFileFn);
       states.push(state);
     }
 
-    var flowfiles = await Promise.all(states);
-    for (let ff of flowfiles) {
-      this.hook('file-added', ff, event);
-      await this.aHook('file-added', ff, event);
+    let flowFiles = await Promise.all(states);
+    for (let ff of flowFiles) {
+      await this.hook('file-added', ff, event);
     }
 
-    this.hook('files-added', flowfiles, event);
-    await this.aHook('files-added', flowfiles, event);
+    // TODO: It's kinda ugly to have the same filter run once after both hooks,
+    // but it matches the old v2 and v3's synchronous behaviour where `files-added`
+    // received the list filtered by individual `file-added`s
+    flowFiles = flowFiles.filter(f => f && f.file);
+
+    await this.hook('files-added', flowFiles, event);
 
-    flowfiles = flowfiles.filter(e => e && e.file);
-    for (let file of flowfiles) {
+    // TODO: see above
+    flowFiles = flowFiles.filter(f => f && f.file);
+
+    for (let file of flowFiles) {
       if (this.opts.singleFile && this.files.length > 0) {
         this.removeFile(this.files[0]);
       }
       this.files.push(file);
     }
 
-    this.hook('files-submitted', this.files, event);
-    await this.aHook('files-submitted', this.files, event);
+    await this.hook('files-submitted', this.files, event);
 
-    return flowfiles;
+    return flowFiles;
   }
 
   /**
@@ -686,6 +583,7 @@ export default class Flow extends Eventizer {
         this.files.splice(i, 1);
         file.abort();
         this.emit('file-removed', file);
+        break;
       }
     }
   }
diff --git a/src/FlowChunk.js b/src/FlowChunk.js
index 576c4fe..9c742ad 100644
--- a/src/FlowChunk.js
+++ b/src/FlowChunk.js
@@ -466,7 +466,7 @@ export default class FlowChunk {
     } else {
       if (this.flowObj.opts.successStatuses.indexOf(this.xhr.status) > -1) {
         // HTTP 200, perfect
-	// HTTP 202 Accepted - The request has been accepted for processing, but the processing has not been completed.
+        // HTTP 202 Accepted - The request has been accepted for processing, but the processing has not been completed.
         return 'success';
       } else if (this.flowObj.opts.permanentErrors.indexOf(this.xhr.status) > -1 ||
                  !isTest && this.retries >= this.flowObj.opts.maxChunkRetries) {
diff --git a/test/asyncSpec.js b/test/asyncSpec.js
index e35b3da..1700d25 100644
--- a/test/asyncSpec.js
+++ b/test/asyncSpec.js
@@ -159,22 +159,22 @@ describe('upload stream', function() {
           await sleep(250);
           customFunction();
         };
-    flowfiles = await flow.asyncAddFiles([sample_file], null, initFileFunction);
+    flowfiles = await flow.addFiles([sample_file], null, initFileFunction);
     expect(customFunction).toHaveBeenCalledTimes(1);
 
     // If re-adding the same file, it's ignored, not incrementing the number of
     // calls to the initFileFn
-    await flow.asyncAddFiles([sample_file], null, initFileFunction);
+    await flow.addFiles([sample_file], null, initFileFunction);
     expect(customFunction).toHaveBeenCalledTimes(1);
 
     // But if removed, then the function is run again
     flow.removeFile(flowfiles[0]);
-    flowfiles = await flow.asyncAddFiles([sample_file], null, initFileFunction);
+    flowfiles = await flow.addFiles([sample_file], null, initFileFunction);
     expect(customFunction).toHaveBeenCalledTimes(2);
 
     // It should work with addFile() too.
     flow.removeFile(flowfiles[0]);
-    flowfiles = await flow.asyncAddFile(sample_file, null, initFileFunction);
+    flowfiles = await flow.addFile(sample_file, null, initFileFunction);
     expect(customFunction).toHaveBeenCalledTimes(3);
   });
 
@@ -187,29 +187,18 @@ describe('upload stream', function() {
           customFunction();
         };
     flow.opts.initFileFn = initFileFunction;
-    await flow.asyncAddFile(sample_file);
+    await flow.addFile(sample_file);
     expect(customFunction).toHaveBeenCalledTimes(1);
   });
 
-  it('asyncAddFile can also be called with no initFileFunction', async function() {
+  it('addFile can also be called with no initFileFunction', async function() {
     var content = gen_file(2, 256),
         sample_file = new File([content], `foobar-asyncInitFileFn-${jasmine.currentTest.id}.bin`),
         customFunction = jasmine.createSpy('fn');
-    await flow.asyncAddFile(sample_file);
+    await flow.addFile(sample_file);
     expect(flow.files.length).toEqual(1);
   });
 
-  it('adding async hook but calling addFiles() should trigger a warning', async function () {
-    var content = gen_file(2, 256),
-        sample_file = new File([content], `async+addFiles-${jasmine.currentTest.id}.bin`),
-        customFunction = jasmine.createSpy('fn');
-    flow.on('files-added', async (file) => await file);
-
-    spyOn(console, 'warn');
-    flow.addFile(sample_file);
-    expect(console.warn).toHaveBeenCalled();
-  });
-
   it('async stream support request temporary failure', async function () {
     // ToDo: This test use low-level files[0].chunks[x].send(); to do atomic
     // uploads and avoid the unstoppable (recursive) loop.
@@ -222,7 +211,7 @@ describe('upload stream', function() {
     flow.opts.chunkSize = 1;
     flow.opts.maxChunkRetries = 3;
     flow.opts.simultaneousUploads = 2;
-    await flow.asyncAddFile(new File(['12'], `stream-failure-${jasmine.currentTest.id}.bin`));
+    await flow.addFile(new File(['12'], `stream-failure-${jasmine.currentTest.id}.bin`));
     var files = flow.files;
     expect(files[0].chunks.length).toBe(2);
 
@@ -256,7 +245,7 @@ describe('upload stream', function() {
     flow.opts.chunkSize = 1;
     flow.opts.maxChunkRetries = 3;
     flow.opts.simultaneousUploads = 2;
-    await flow.asyncAddFiles([
+    await flow.addFiles([
       new File(['1234'], `multi1-${jasmine.currentTest.id}.bin`),
       new File(['56789'], `multi2-${jasmine.currentTest.id}.bin`)
     ]);
@@ -264,7 +253,7 @@ describe('upload stream', function() {
     await flow.files[0].chunks[0].send();
     await flow.files[1].chunks[0].send();
     for (let i = 0; i < (9 - 2); i++) {
-      flow.uploadNextChunk(true);
+      await flow.uploadNextChunk(true);
       await sleep(1);
     }
 
@@ -297,7 +286,7 @@ describe('upload stream', function() {
     flow.opts.chunkSize = 1;
     flow.opts.maxChunkRetries = 3;
     flow.opts.simultaneousUploads = 2;
-    await flow.asyncAddFiles([
+    await flow.addFiles([
       new File(['123456'], `foobar1-${jasmine.currentTest.id}.bin`),
       new File(['789'], `foobar2-${jasmine.currentTest.id}.bin`)
     ]);
@@ -311,7 +300,7 @@ describe('upload stream', function() {
     */
     expect(files[0].chunks.length).toBe(6);
     expect(files[1].chunks.length).toBe(3);
-    flow.upload();
+    flow.upload(); // intentionally don't await here
     expect(files[0].isReading()).toBeTruthy();
     await sleep(1);
 
@@ -355,7 +344,7 @@ describe('upload stream', function() {
     expect(xhr_server.requests[4].aborted).toBeUndefined();
     expect(files[0].isUploading()).toBeFalsy();
 
-    flow.upload();
+    await flow.upload();
     await sleep(1);
     expect(files[0].isUploading()).toBeFalsy();
     expect(files[1].isUploading()).toBeTruthy();
diff --git a/test/eventsSpec.js b/test/eventsSpec.js
index f126df4..383d8b7 100644
--- a/test/eventsSpec.js
+++ b/test/eventsSpec.js
@@ -1,127 +1,127 @@
-describe('events', function() {
-  /**
-   * @type {Flow}
-   */
-  var flow;
-
-  beforeEach(function () {
-    flow = new Flow();
-  });
-
-  it('should catch an event', function() {
-    var valid = false;
-    flow.on('test', () => {
-      valid = true;
-    });
-    flow.emit('test');
-    expect(valid).toBeTruthy();
-  });
-
-  it('should have a context of flow instance', function() {
-    var context = null;
-    flow.on('test', function () {
-      context = this;
-    });
-    flow.emit('test');
-    expect(context).toEqual(flow);
-  });
-
-  it('should pass some arguments', function() {
-    var valid = false;
-    var argumentOne = 123;
-    var argumentTwo = "dqw";
-    flow.on('test', function ({detail: [...arguments]}) {
-      expect(arguments.length).toBe(2);
-      expect(arguments[0]).toBe(argumentOne);
-      expect(arguments[1]).toBe(argumentTwo);
-      expect(arguments[2]).toBeUndefined();
-      valid = true;
-    });
-    flow.emit('test', argumentOne, argumentTwo);
-    expect(valid).toBeTruthy();
-  });
-
-  it('should throw catchall event last', function() {
-    var executed = 0;
-    flow.on('catch-all', function ({detail: [event, one, ...args]}) {
-      expect(event).toBe('test');
-      expect(one).toBe(1);
-      expect(executed).toBe(1);
-      executed++;
-    });
-    flow.on('test', ({detail: [one]}) => {
-      expect(one).toBe(1);
-      expect(executed).toBe(0);
-      executed++;
-    });
-    flow.emit('test', 1);
-    expect(executed).toBe(2);
-  });
-
-  it('should not return event value', async function() {
-    flow.on('false', () => false);
-    flow.on('true', () => true);
-
-    expect(flow.emit('true')).toEqual(jasmine.any(Promise));
-    // Native event does not provide their event value and
-    // are fully sent in a fully asynchronous way.
-    await expectAsync(flow.emit('true')).toBeResolvedTo(undefined);
-    await expectAsync(flow.emit('not existant')).toBeResolvedTo(undefined);
-    await expectAsync(flow.emit('false')).toBeResolvedTo(undefined);
-  });
-
-  it('should run all event handlers', function() {
-    var customFunction = jasmine.createSpy('fn');
-    flow.on('maybe', () => customFunction(1));
-    flow.on('maybe', () => customFunction(2));
-    flow.emit('maybe', 1);
-    expect(customFunction).toHaveBeenCalledTimes(2);
-  });
-
-  describe('off', function () {
-    var event, unbinder;
-    beforeEach(function () {
-      event = jasmine.createSpy('event');
-      unbinder = flow.on('event', event);
-    });
-    it('should remove event', function () {
-      flow.off('event');
-      flow.emit('event');
-      expect(event).not.toHaveBeenCalled();
-    });
-    it('should remove event', function () {
-      console.log(unbinder);
-      unbinder();
-      flow.emit('event');
-      expect(event).not.toHaveBeenCalled();
-    });
-    it('should remove specific event', function () {
-      flow.off('event', event);
-      flow.emit('event');
-      expect(event).not.toHaveBeenCalled();
-    });
-    it('should remove all events', function () {
-      flow.off();
-      flow.emit('event');
-      expect(event).not.toHaveBeenCalled();
-    });
-  });
-
-  describe('once', function () {
-    var event;
-    it('should just once', function () {
-      event = jasmine.createSpy('event');
-      flow.once('event', event);
-      flow.emit('event');
-      flow.emit('event');
-      expect(event).toHaveBeenCalledTimes(1);
-    });
-
-    it('should warn that once() is not supported for hooks', function () {
-      spyOn(console, 'warn');
-      event = jasmine.createSpy('files-added');
-      flow.once('files-added', event);
-      expect(console.warn).toHaveBeenCalled();
-    });
-  });
-});
+describe('events', function() {
+  /**
+   * @type {Flow}
+   */
+  var flow;
+
+  beforeEach(function () {
+    flow = new Flow();
+  });
+
+  it('should catch an event', function() {
+    var valid = false;
+    flow.on('test', () => {
+      valid = true;
+    });
+    flow.emit('test');
+    expect(valid).toBeTruthy();
+  });
+
+  it('should have a context of flow instance', function() {
+    var context = null;
+    flow.on('test', function () {
+      context = this;
+    });
+    flow.emit('test');
+    expect(context).toEqual(flow);
+  });
+
+  it('should pass some arguments', function() {
+    var valid = false;
+    var argumentOne = 123;
+    var argumentTwo = "dqw";
+    flow.on('test', function ({detail: [...arguments]}) {
+      expect(arguments.length).toBe(2);
+      expect(arguments[0]).toBe(argumentOne);
+      expect(arguments[1]).toBe(argumentTwo);
+      expect(arguments[2]).toBeUndefined();
+      valid = true;
+    });
+    flow.emit('test', argumentOne, argumentTwo);
+    expect(valid).toBeTruthy();
+  });
+
+  it('should throw catchall event last', function() {
+    var executed = 0;
+    flow.on('catch-all', function ({detail: [event, one, ...args]}) {
+      expect(event).toBe('test');
+      expect(one).toBe(1);
+      expect(executed).toBe(1);
+      executed++;
+    });
+    flow.on('test', ({detail: [one]}) => {
+      expect(one).toBe(1);
+      expect(executed).toBe(0);
+      executed++;
+    });
+    flow.emit('test', 1);
+    expect(executed).toBe(2);
+  });
+
+  it('should not return event value', async function() {
+    flow.on('false', () => false);
+    flow.on('true', () => true);
+
+    expect(flow.emit('true')).toEqual(jasmine.any(Promise));
+    // Native event does not provide their event value and
+    // are fully sent in a fully asynchronous way.
+    await expectAsync(flow.emit('true')).toBeResolvedTo(undefined);
+    await expectAsync(flow.emit('not existant')).toBeResolvedTo(undefined);
+    await expectAsync(flow.emit('false')).toBeResolvedTo(undefined);
+  });
+
+  it('should run all event handlers', function() {
+    var customFunction = jasmine.createSpy('fn');
+    flow.on('maybe', () => customFunction(1));
+    flow.on('maybe', () => customFunction(2));
+    flow.emit('maybe', 1);
+    expect(customFunction).toHaveBeenCalledTimes(2);
+  });
+
+  describe('off', function () {
+    var event, unbinder;
+    beforeEach(function () {
+      event = jasmine.createSpy('event');
+      unbinder = flow.on('event', event);
+    });
+    it('should remove event', function () {
+      flow.off('event');
+      flow.emit('event');
+      expect(event).not.toHaveBeenCalled();
+    });
+    it('should remove event', function () {
+      console.log(unbinder);
+      unbinder();
+      flow.emit('event');
+      expect(event).not.toHaveBeenCalled();
+    });
+    it('should remove specific event', function () {
+      flow.off('event', event);
+      flow.emit('event');
+      expect(event).not.toHaveBeenCalled();
+    });
+    it('should remove all events', function () {
+      flow.off();
+      flow.emit('event');
+      expect(event).not.toHaveBeenCalled();
+    });
+  });
+
+  describe('once', function () {
+    var event;
+    it('should just once', function () {
+      event = jasmine.createSpy('event');
+      flow.once('event', event);
+      flow.emit('event');
+      flow.emit('event');
+      expect(event).toHaveBeenCalledTimes(1);
+    });
+
+    it('should warn that once() is not supported for hooks', function () {
+      spyOn(console, 'warn');
+      event = jasmine.createSpy('files-added');
+      flow.once('files-added', event);
+      expect(console.warn).toHaveBeenCalled();
+    });
+  });
+});
diff --git a/test/fileAddSpec.js b/test/fileAddSpec.js
index 779385f..d5f536e 100644
--- a/test/fileAddSpec.js
+++ b/test/fileAddSpec.js
@@ -1,176 +1,176 @@
-describe('fileAdd event', function() {
-  /**
-   * @type {Flow}
-   */
-  var flow;
-
-  beforeEach(function () {
-    flow = new Flow({
-      generateUniqueIdentifier: function (file) {
-        return file.size;
-      }
-    });
-  });
-
-  it('should call file-added event', function() {
-    var valid = false;
-    flow.on('file-added', (file) => {
-      expect(file.file instanceof Blob).toBeTruthy();
-      valid = true;
-    });
-    flow.addFile(new Blob(['file part']));
-    expect(valid).toBeTruthy();
-  });
-
-  it('should call files-added event', function() {
-    var count = 0;
-    flow.on('files-added', (files) => {
-      count = files.length;
-    });
-    flow.addFiles([
-      new Blob(['file part']),
-      new Blob(['file 2 part'])
-    ]);
-    expect(count).toBe(2);
-    expect(flow.files.length).toBe(2);
-  });
-
-  it('should call file-added only when bound', function() {
-    var event = jasmine.createSpy('event');
-
-    flow.on('file-added', event);
-    flow.addFile(new File(['file part'], 'a.bin'));
-    expect(event).toHaveBeenCalledTimes(1);
-
-    flow.off('file-added');
-    flow.addFile(new File(['file part'], 'b.bin'));
-    expect(event).toHaveBeenCalledTimes(1);
-  });
-
-  it('file-added can be removed specifying the callback', function() {
-    var event = jasmine.createSpy('event');
-    flow.on('file-added', event);
-    flow.addFile(new File(['file part'], 'c.bin'));
-    expect(event).toHaveBeenCalledTimes(1);
-
-    flow.off('file-added', event);
-    flow.addFile(new File(['file part'], 'd.bin'));
-    expect(event).toHaveBeenCalledTimes(1);
-  });
-
-  it('should validate file-added', function() {
-    spyOn(console, 'warn');
-    flow.on('file-added', (file) => {
-      delete file.file;
-      return false;
-    });
-    flow.addFile(new Blob(['file part']));
-    expect(flow.files.length).toBe(0);
-    expect(console.warn).toHaveBeenCalledTimes(1);
-  });
-
-  it('should keeps file from being queued', function() {
-    spyOn(console, 'warn');
-    flow.on('filter-file', () => false);
-    flow.addFile(new Blob(['file part']));
-    expect(flow.files.length).toBe(0);
-    expect(console.warn).not.toHaveBeenCalled();
-  });
-
-  it('should validate filter-file and files-added', function() {
-    flow.on('filter-file', () => false);
-    var valid = false;
-    flow.on('files-added', (files) => {
-      valid = files.length === 0;
-    });
-    flow.addFile(new Blob(['file part']));
-    expect(valid).toBeTruthy();
-  });
-
-  describe('async/sync hooks', function () {
-    beforeAll(function() {
-      jasmine.getEnv().addReporter({
-        specStarted: result => (jasmine.currentTest = result),
-        specDone: result => (jasmine.currentTest = result),
-      });
-    });
-
-    it('An async files-added hook', async function() {
-      var flowfiles,
-          content = gen_file(4, 512),
-          sample_file = new File([content], `foobar-asyncInitFileFn-${jasmine.currentTest.id}.bin`),
-          customFunction1 = jasmine.createSpy('fn'),
-          customFunction2 = jasmine.createSpy('fn');
-      flow.on('files-added', (files) => {
-        customFunction1();
-      });
-      flow.on('files-added', async (files) => {
-        await sleep(250);
-        customFunction2();
-      });
-
-      flowfiles = await flow.asyncAddFiles([sample_file]);
-      expect(customFunction1).toHaveBeenCalledTimes(1);
-      expect(customFunction2).toHaveBeenCalledTimes(1);
-    });
-
-    it('file-added hook can actually change one file', async () => {
-      flow.on('file-added', (flowfile) => {
-        // Synchronous hook changes the filename of the first file
-        if (flowfile.name.includes('aaa')) {
-          flowfile.name = 'bbb.bin';
-        }
-      });
-      flow.on('file-added', async (flowfile) => {
-        await sleep(250);
-        // Asynchronous hook replace the content
-        var text = (await flowfile.file.text()).replace(/a/g, 'x');
-        flowfile.file = new File([text], flowfile.name);
-      });
-
-      var flowfiles = await flow.asyncAddFiles([
-        new File(['aaa'], 'aaa.bin'),
-        new File(['GGG'], 'GGG.bin'),
-      ]);
-      expect(flowfiles[0].name).toBe('bbb.bin');
-      expect(await flowfiles[0].file.text()).toBe('xxx');
-    });
-
-    it('A files-added hook can actually change files', async function() {
-      var flowfiles,
-          customFunction = jasmine.createSpy('fn'),
-          files = [
-            new File(['abc'], `foobar-abc-${jasmine.currentTest.id}.bin`),
-            new File(['def'], `foobar-def-${jasmine.currentTest.id}.bin`)
-          ];
-
-      flow.on('files-added', (files, event) => {
-        customFunction();
-        expect(files.length).toEqual(2);
-        files.reverse();
-      });
-
-      flowfiles = await flow.asyncAddFiles(files);
-      expect(customFunction).toHaveBeenCalledTimes(1);
-      expect(flowfiles.length).toEqual(2);
-      // The files have been inverted by the hook
-      expect(flowfiles[0].name).toEqual(`foobar-def-${jasmine.currentTest.id}.bin`);
-    });
-
-    it('A files-added hook can actually change files', async function() {
-      var flowfiles,
-          customFunction = jasmine.createSpy('fn'),
-          files = ['abc', 'def', 'ghi', 'jkl', 'mno', 'pqr', 'stu']
-          .map(e => new File([e], `foobar-${e}-${jasmine.currentTest.id}.bin`));
-
-      flow.on('filter-file', (flowFile, event) => {
-        customFunction();
-        return /\b(abc|def)\b/.test(flowFile.name);
-      });
-
-      flowfiles = await flow.asyncAddFiles(files);
-      expect(customFunction).toHaveBeenCalledTimes(7);
-      expect(flowfiles.length).toEqual(2);
-    });
-  });
-});
+describe('fileAdd event', function() {
+  /**
+   * @type {Flow}
+   */
+  var flow;
+
+  beforeEach(function () {
+    flow = new Flow({
+      generateUniqueIdentifier: function (file) {
+        return file.size;
+      }
+    });
+  });
+
+  it('should call file-added event', async function() {
+    var valid = false;
+    flow.on('file-added', (file) => {
+      expect(file.file instanceof Blob).toBeTruthy();
+      valid = true;
+    });
+    await flow.addFile(new Blob(['file part']));
+    expect(valid).toBeTruthy();
+  });
+
+  it('should call files-added event', async function() {
+    var count = 0;
+    flow.on('files-added', (files) => {
+      count = files.length;
+    });
+    await flow.addFiles([
+      new Blob(['file part']),
+      new Blob(['file 2 part'])
+    ]);
+    expect(count).toBe(2);
+    expect(flow.files.length).toBe(2);
+  });
+
+  it('should call file-added only when bound', async function() {
+    var event = jasmine.createSpy('event');
+
+    flow.on('file-added', event);
+    await flow.addFile(new File(['file part'], 'a.bin'));
+    expect(event).toHaveBeenCalledTimes(1);
+
+    flow.off('file-added');
+    flow.addFile(new File(['file part'], 'b.bin'));
+    expect(event).toHaveBeenCalledTimes(1);
+  });
+
+  it('file-added can be removed specifying the callback', async function() {
+    var event = jasmine.createSpy('event');
+    flow.on('file-added', event);
+    await flow.addFile(new File(['file part'], 'c.bin'));
+    expect(event).toHaveBeenCalledTimes(1);
+
+    flow.off('file-added', event);
+    flow.addFile(new File(['file part'], 'd.bin'));
+    expect(event).toHaveBeenCalledTimes(1);
+  });
+
+  it('should validate file-added', async function() {
+    spyOn(console, 'warn');
+    flow.on('file-added', (file) => {
+      delete file.file;
+      return false;
+    });
+    await flow.addFile(new Blob(['file part']));
+    expect(flow.files.length).toBe(0);
+    expect(console.warn).toHaveBeenCalledTimes(1);
+  });
+
+  it('should keeps file from being queued', function() {
+    spyOn(console, 'warn');
+    flow.on('filter-file', () => false);
+    flow.addFile(new Blob(['file part']));
+    expect(flow.files.length).toBe(0);
+    expect(console.warn).not.toHaveBeenCalled();
+  });
+
+  it('should validate filter-file and files-added', async function() {
+    flow.on('filter-file', () => false);
+    var valid = false;
+    flow.on('files-added', (files) => {
+      valid = files.length === 0;
+    });
+    await flow.addFile(new Blob(['file part']));
+    expect(valid).toBeTruthy();
+  });
+
+  describe('async/sync hooks', function () {
+    beforeAll(function() {
+      jasmine.getEnv().addReporter({
+        specStarted: result => (jasmine.currentTest = result),
+        specDone: result => (jasmine.currentTest = result),
+      });
+    });
+
+    it('An async files-added hook', async function() {
+      var flowfiles,
+          content = gen_file(4, 512),
+          sample_file = new File([content], `foobar-asyncInitFileFn-${jasmine.currentTest.id}.bin`),
+          customFunction1 = jasmine.createSpy('fn'),
+          customFunction2 = jasmine.createSpy('fn');
+      flow.on('files-added', (files) => {
+        customFunction1();
+      });
+      flow.on('files-added', async (files) => {
+        await sleep(250);
+        customFunction2();
+      });
+
+      flowfiles = await flow.addFiles([sample_file]);
+      expect(customFunction1).toHaveBeenCalledTimes(1);
+      expect(customFunction2).toHaveBeenCalledTimes(1);
+    });
+
+    it('file-added hook can actually change one file', async () => {
+      flow.on('file-added', (flowfile) => {
+        // Synchronous hook changes the filename of the first file
+        if (flowfile.name.includes('aaa')) {
+          flowfile.name = 'bbb.bin';
+        }
+      });
+      flow.on('file-added', async (flowfile) => {
+        await sleep(250);
+        // Asynchronous hook replace the content
+        var text = (await flowfile.file.text()).replace(/a/g, 'x');
+        flowfile.file = new File([text], flowfile.name);
+      });
+
+      var flowfiles = await flow.addFiles([
+        new File(['aaa'], 'aaa.bin'),
+        new File(['GGG'], 'GGG.bin'),
+      ]);
+      expect(flowfiles[0].name).toBe('bbb.bin');
+      expect(await flowfiles[0].file.text()).toBe('xxx');
+    });
+
+    it('A files-added hook can actually change files', async function() {
+      var flowfiles,
+          customFunction = jasmine.createSpy('fn'),
+          files = [
+            new File(['abc'], `foobar-abc-${jasmine.currentTest.id}.bin`),
+            new File(['def'], `foobar-def-${jasmine.currentTest.id}.bin`)
+          ];
+
+      flow.on('files-added', (files, event) => {
+        customFunction();
+        expect(files.length).toEqual(2);
+        files.reverse();
+      });
+
+      flowfiles = await flow.addFiles(files);
+      expect(customFunction).toHaveBeenCalledTimes(1);
+      expect(flowfiles.length).toEqual(2);
+      // The files have been inverted by the hook
+      expect(flowfiles[0].name).toEqual(`foobar-def-${jasmine.currentTest.id}.bin`);
+    });
+
+    it('A files-added hook can actually change files', async function() {
+      var flowfiles,
+          customFunction = jasmine.createSpy('fn'),
+          files = ['abc', 'def', 'ghi', 'jkl', 'mno', 'pqr', 'stu']
+          .map(e => new File([e], `foobar-${e}-${jasmine.currentTest.id}.bin`));
+
+      flow.on('filter-file', (flowFile, event) => {
+        customFunction();
+        return /\b(abc|def)\b/.test(flowFile.name);
+      });
+
+      flowfiles = await flow.addFiles(files);
+      expect(customFunction).toHaveBeenCalledTimes(7);
+      expect(flowfiles.length).toEqual(2);
+    });
+  });
+});
diff --git a/test/fileRemoveSpec.js b/test/fileRemoveSpec.js
index a0cfce3..c814db8 100644
--- a/test/fileRemoveSpec.js
+++ b/test/fileRemoveSpec.js
@@ -1,45 +1,44 @@
-describe('file-removed event', function() {
-  /**
-   * @type {Flow}
-   */
-  var flow;
-
-  beforeEach(function () {
-    flow = new Flow({
-      generateUniqueIdentifier: function (file) {
-        return file.size;
-      }
-    });
-  });
-
-  it('should call file-removed event on Flow.removeFile', function() {
-    var valid = false;
-    var removedFile = null;
-    flow.on('file-removed', ({detail: [file]}) => {
-      expect(file.file instanceof Blob).toBeTruthy();
-      removedFile = file;
-      valid = true;
-    });
-    flow.addFile(new Blob(['file part']));
-    var addedFile = flow.files[0];
-    flow.removeFile(addedFile);
-    expect(removedFile).toBe(addedFile);
-    expect(valid).toBeTruthy();
-  });
-  
-  it('should call file-removed event FlowFile.cancel', function() {
-    var valid = false;
-    var removedFile = null;
-    flow.on('file-removed', ({detail: [file]}) => {
-      expect(file.file instanceof Blob).toBeTruthy();
-      removedFile = file;
-      valid = true;
-    });
-    flow.addFile(new Blob(['file part']));
-    var addedFile = flow.files[0];
-    addedFile.cancel();
-    expect(removedFile).toBe(addedFile);
-    expect(valid).toBeTruthy();
-  });  
-
-});
+describe('file-removed event', function() {
+  /**
+   * @type {Flow}
+   */
+  var flow;
+
+  beforeEach(function () {
+    flow = new Flow({
+      generateUniqueIdentifier: function (file) {
+        return file.size;
+      }
+    });
+  });
+
+  it('should call file-removed event on Flow.removeFile', async function() {
+    var valid = false;
+    var removedFile = null;
+    flow.on('file-removed', ({detail: [file]}) => {
+      expect(file.file instanceof Blob).toBeTruthy();
+      removedFile = file;
+      valid = true;
+    });
+    await flow.addFile(new Blob(['file part']));
+    var addedFile = flow.files[0];
+    flow.removeFile(addedFile);
+    expect(removedFile).toBe(addedFile);
+    expect(valid).toBeTruthy();
+  });
+
+  it('should call file-removed event FlowFile.cancel', async function() {
+    var valid = false;
+    var removedFile = null;
+    flow.on('file-removed', ({detail: [file]}) => {
+      expect(file.file instanceof Blob).toBeTruthy();
+      removedFile = file;
+      valid = true;
+    });
+    await flow.addFile(new Blob(['file part']));
+    var addedFile = flow.files[0];
+    addedFile.cancel();
+    expect(removedFile).toBe(addedFile);
+    expect(valid).toBeTruthy();
+  });
+});
diff --git a/test/fileSpec.js b/test/fileSpec.js
index ad8ac72..ffe95ec 100644
--- a/test/fileSpec.js
+++ b/test/fileSpec.js
@@ -1,39 +1,38 @@
-describe('FlowFile functions', function() {
-
-  /**
-   * @type {Flow}
-   */
-  var flow;
-  /**
-   * @type {Flow.FlowFile}
-   */
-  var file;
-
-  beforeEach(function () {
-    flow = new Flow({
-    });
-    file = new FlowFile(flow, {
-      name: 'image.jpg',
-      type: 'image/png'
-    });
-    file.bootstrap();
-  });
-
-  it('should get type', function() {
-    expect(file.getType()).toBe('png');
-    file.file.type = '';
-    expect(file.getType()).toBe('');
-  });
-
-  it('should get extension', function() {
-    expect(file.name).toBe('image.jpg');
-    expect(file.getExtension()).toBe('jpg');
-    file.name = '';
-    expect(file.getExtension()).toBe('');
-    file.name = 'image';
-    expect(file.getExtension()).toBe('');
-    file.name = '.dwq.dq.wd.qdw.E';
-    expect(file.getExtension()).toBe('e');
-  });
-
-});
+describe('FlowFile functions', function() {
+
+  /**
+   * @type {Flow}
+   */
+  var flow;
+  /**
+   * @type {Flow.FlowFile}
+   */
+  var file;
+
+  beforeEach(function () {
+    flow = new Flow({
+    });
+    file = new FlowFile(flow, {
+      name: 'image.jpg',
+      type: 'image/png'
+    });
+    file.bootstrap();
+  });
+
+  it('should get type', function() {
+    expect(file.getType()).toBe('png');
+    file.file.type = '';
+    expect(file.getType()).toBe('');
+  });
+
+  it('should get extension', function() {
+    expect(file.name).toBe('image.jpg');
+    expect(file.getExtension()).toBe('jpg');
+    file.name = '';
+    expect(file.getExtension()).toBe('');
+    file.name = 'image';
+    expect(file.getExtension()).toBe('');
+    file.name = '.dwq.dq.wd.qdw.E';
+    expect(file.getExtension()).toBe('e');
+  });
+});
diff --git a/test/setupSpec.js b/test/setupSpec.js
index 9578f6c..d8a10b7 100644
--- a/test/setupSpec.js
+++ b/test/setupSpec.js
@@ -1,138 +1,135 @@
-describe('setup', function() {
-  /**
-   * @type {Flow}
-   */
-  var flow;
-
-  beforeEach(function () {
-    flow = new Flow({
-      generateUniqueIdentifier: function (file) {
-        return file.size;
-      }
-    });
-  });
-
-  it('files should be empty', function() {
-    expect(flow.files).toBeDefined();
-    expect(flow.files.length).toBe(0);
-  });
-
-  it('events should be empty', function() {
-    expect(flow._events).toBeDefined();
-    expect(flow._hooks).toBeDefined();
-    expect(flow._asyncHooks).toBeDefined();
-    expect(Object.keys(flow._events).length).toBe(0);
-    expect(Object.keys(flow._hooks).length).toBe(0);
-    expect(Object.keys(flow._asyncHooks).length).toBe(0);
-  });
-
-  it('set opts', function() {
-    flow = new Flow({
-      chunkSize: 123
-    });
-    expect(flow.opts.chunkSize).toBe(123);
-    expect(flow.opts.simultaneousUploads).toBe(flow.defaults.simultaneousUploads);
-  });
-
-  it('should show methods initial state', function() {
-    expect(flow.uploadNextChunk()).toBe(false);
-
-    expect(flow.progress()).toBe(0);
-    expect(flow.isUploading()).toBe(false);
-    expect(flow.timeRemaining()).toBe(0);
-    expect(flow.sizeUploaded()).toBe(0);
-  });
-
-  it('should return total files size', function() {
-    expect(flow.getSize()).toBe(0);
-    flow.addFile(new Blob(['1234']));
-    expect(flow.getSize()).toBe(4);
-    flow.addFile(new Blob(['123']));
-    expect(flow.getSize()).toBe(7);
-  });
-
-  it('should find file by identifier', function() {
-    expect(flow.getFromUniqueIdentifier('')).toBe(false);
-    flow.addFile(new Blob(['1234']));
-    expect(flow.getFromUniqueIdentifier(4)).toBe(flow.files[0]);
-  });
-
-  it("consider events set in constructor's second parameter", function() {
-    var customEventHandler = () => console.log("_custom event fired"),
-        customEvent = jasmine.createSpy('customEventHandler'),
-        f = new Flow({}, {_custom: [customEvent]});
-    f.emit('_custom');
-    expect(customEvent).toHaveBeenCalledTimes(1);
-  });
-
-  it("events are not lowercased", function() {
-    var customEventHandler = () => console.log("_custom event fired"),
-        customEvent = jasmine.createSpy('customEventHandler'),
-        f = new Flow({}, {_CusTom: [customEvent]});
-    f.emit('_custom');
-    expect(customEvent).not.toHaveBeenCalled();
-  });
-
-  describe('assignBrowse', function() {
-    it('assign to input', function() {
-      var input = document.createElement('input');
-      var addFiles = jasmine.createSpy('addFiles');
-      flow.addFiles = addFiles;
-      input.type = 'file';
-      flow.assignBrowse(input);
-      expect(input.hasAttribute('multiple')).toBeTruthy();
-      expect(addFiles).not.toHaveBeenCalled();
-      var event = document.createEvent('MouseEvents');
-      event.initEvent('change', true, true);
-      input.dispatchEvent(event);
-      expect(addFiles).not.toHaveBeenCalled();
-    });
-
-    it('assign to div', function() {
-      var div = document.createElement('div');
-      var addFiles = jasmine.createSpy('addFiles');
-      flow.addFiles = addFiles;
-      flow.assignBrowse(div);
-      expect(div.children.length).toBe(1);
-      var input = div.children[0];
-      expect(addFiles).not.toHaveBeenCalled();
-      var event = document.createEvent('MouseEvents');
-      event.initEvent('change', true, true);
-      input.dispatchEvent(event);
-      expect(addFiles).not.toHaveBeenCalled();
-    });
-
-    it('single file', function() {
-      var input = document.createElement('input');
-      input.type = 'file';
-      flow.assignBrowse(input, false, true);
-      expect(input.hasAttribute('multiple')).toBeFalsy();
-    });
-
-    it('directory', function() {
-      var input = document.createElement('input');
-      input.type = 'file';
-      flow.assignBrowse(input, true);
-      expect(input.hasAttribute('webkitdirectory')).toBeTruthy();
-    });
-  });
-
-  describe('assignDrop', function() {
-    it('assign to div', function() {
-      var div = document.createElement('div'),
-          event = document.createEvent('MouseEvents');
-      event.initEvent('drop', true, true);
-      event.dataTransfer = {files: []};
-
-      spyOn(flow, 'onDrop').and.callThrough();
-      flow.assignDrop(div);
-      div.dispatchEvent(event);
-      expect(flow.onDrop).toHaveBeenCalledTimes(1);
-
-      flow.unAssignDrop(div);
-      div.dispatchEvent(event);
-      expect(flow.onDrop).toHaveBeenCalledTimes(1);
-    });
-  });
-
-});
+describe('setup', function() {
+  /**
+   * @type {Flow}
+   */
+  var flow;
+
+  beforeEach(function () {
+    flow = new Flow({
+      generateUniqueIdentifier: function (file) {
+        return file.size;
+      }
+    });
+  });
+
+  it('files should be empty', function() {
+    expect(flow.files).toBeDefined();
+    expect(flow.files.length).toBe(0);
+  });
+
+  it('events should be empty', function() {
+    expect(flow._events).toBeDefined();
+    expect(flow._hooks).toBeDefined();
+    expect(Object.keys(flow._events).length).toBe(0);
+    expect(Object.keys(flow._hooks).length).toBe(0);
+  });
+
+  it('set opts', function() {
+    flow = new Flow({
+      chunkSize: 123
+    });
+    expect(flow.opts.chunkSize).toBe(123);
+    expect(flow.opts.simultaneousUploads).toBe(flow.defaults.simultaneousUploads);
+  });
+
+  it('should show methods initial state', async function() {
+    expect(await flow.uploadNextChunk()).toBe(false);
+
+    expect(flow.progress()).toBe(0);
+    expect(flow.isUploading()).toBe(false);
+    expect(flow.timeRemaining()).toBe(0);
+    expect(flow.sizeUploaded()).toBe(0);
+  });
+
+  it('should return total files size', async function() {
+    expect(flow.getSize()).toBe(0);
+    await flow.addFile(new Blob(['1234']));
+    expect(flow.getSize()).toBe(4);
+    await flow.addFile(new Blob(['123']));
+    expect(flow.getSize()).toBe(7);
+  });
+
+  it('should find file by identifier', async function() {
+    expect(flow.getFromUniqueIdentifier('')).toBe(false);
+    await flow.addFile(new Blob(['1234']));
+    expect(flow.getFromUniqueIdentifier(4)).toBe(flow.files[0]);
+  });
+
+  it("consider events set in constructor's second parameter", function() {
+    var customEventHandler = () => console.log("_custom event fired"),
+        customEvent = jasmine.createSpy('customEventHandler'),
+        f = new Flow({}, {_custom: [customEvent]});
+    f.emit('_custom');
+    expect(customEvent).toHaveBeenCalledTimes(1);
+  });
+
+  it("events are not lowercased", function() {
+    var customEventHandler = () => console.log("_custom event fired"),
+        customEvent = jasmine.createSpy('customEventHandler'),
+        f = new Flow({}, {_CusTom: [customEvent]});
+    f.emit('_custom');
+    expect(customEvent).not.toHaveBeenCalled();
+  });
+
+  describe('assignBrowse', function() {
+    it('assign to input', function() {
+      var input = document.createElement('input');
+      var addFiles = jasmine.createSpy('addFiles');
+      flow.addFiles = addFiles;
+      input.type = 'file';
+      flow.assignBrowse(input);
+      expect(input.hasAttribute('multiple')).toBeTruthy();
+      expect(addFiles).not.toHaveBeenCalled();
+      var event = document.createEvent('MouseEvents');
+      event.initEvent('change', true, true);
+      input.dispatchEvent(event);
+      expect(addFiles).not.toHaveBeenCalled();
+    });
+
+    it('assign to div', function() {
+      var div = document.createElement('div');
+      var addFiles = jasmine.createSpy('addFiles');
+      flow.addFiles = addFiles;
+      flow.assignBrowse(div);
+      expect(div.children.length).toBe(1);
+      var input = div.children[0];
+      expect(addFiles).not.toHaveBeenCalled();
+      var event = document.createEvent('MouseEvents');
+      event.initEvent('change', true, true);
+      input.dispatchEvent(event);
+      expect(addFiles).not.toHaveBeenCalled();
+    });
+
+    it('single file', function() {
+      var input = document.createElement('input');
+      input.type = 'file';
+      flow.assignBrowse(input, false, true);
+      expect(input.hasAttribute('multiple')).toBeFalsy();
+    });
+
+    it('directory', function() {
+      var input = document.createElement('input');
+      input.type = 'file';
+      flow.assignBrowse(input, true);
+      expect(input.hasAttribute('webkitdirectory')).toBeTruthy();
+    });
+  });
+
+  describe('assignDrop', function() {
+    it('assign to div', function() {
+      var div = document.createElement('div'),
+          event = document.createEvent('MouseEvents');
+      event.initEvent('drop', true, true);
+      event.dataTransfer = {files: []};
+
+      spyOn(flow, 'onDrop').and.callThrough();
+      flow.assignDrop(div);
+      div.dispatchEvent(event);
+      expect(flow.onDrop).toHaveBeenCalledTimes(1);
+
+      flow.unAssignDrop(div);
+      div.dispatchEvent(event);
+      expect(flow.onDrop).toHaveBeenCalledTimes(1);
+    });
+  });
+});
diff --git a/test/singleFileSpec.js b/test/singleFileSpec.js
index 5cccdee..5c8b479 100644
--- a/test/singleFileSpec.js
+++ b/test/singleFileSpec.js
@@ -1,45 +1,45 @@
-describe('add single file', function() {
-  /**
-   * @type {Flow}
-   */
-  var flow;
-
-  beforeEach(function () {
-    flow = new Flow({
-      generateUniqueIdentifier: function (file) {
-        return file.size;
-      },
-      singleFile: true
-    });
-  });
-
-  it('should add single file', function() {
-    flow.addFile(new Blob(['file part']));
-    expect(flow.files.length).toBe(1);
-    var file = flow.files[0];
-    flow.upload();
-    expect(file.isUploading()).toBeTruthy();
-    flow.addFile(new Blob(['file part 2']));
-    expect(flow.files.length).toBe(1);
-    expect(file.isUploading()).toBeFalsy();
-  });
-  
-  it('should emit remove event after adding another file', function(){
-    var events = [];
-    flow.on('catch-all', ({detail: [event_name]}) => {
-      events.push(event_name);
-    });
-    flow.addFile(new Blob(['file part']));
-    expect(flow.files.length).toBe(1);
-    expect(events).toEqual(['filter-file', 'file-added', 'files-added', 'files-submitted']);
-
-    var removedFile = flow.files[0];
-    flow.on('file-removed', ({detail: [file]}) => {
-        expect(file).toBe(removedFile); 
-    });
-    flow.addFile(new Blob(['file part 2']));
-    expect(flow.files.length).toBe(1);
-    expect(events.length).toBe(9);
-    expect(events.slice(-5)).toEqual(['filter-file', 'file-added', 'files-added', 'file-removed', 'files-submitted']);
-  });
-});
+describe('add single file', function() {
+  /**
+   * @type {Flow}
+   */
+  var flow;
+
+  beforeEach(function () {
+    flow = new Flow({
+      generateUniqueIdentifier: function (file) {
+        return file.size;
+      },
+      singleFile: true
+    });
+  });
+
+  it('should add single file', async function() {
+    await flow.addFile(new Blob(['file part']));
+    expect(flow.files.length).toBe(1);
+    var file = flow.files[0];
+    await flow.upload();
+    expect(file.isUploading()).toBeTruthy();
+    await flow.addFile(new Blob(['file part 2']));
+    expect(flow.files.length).toBe(1);
+    expect(file.isUploading()).toBeFalsy();
+  });
+
+  it('should emit remove event after adding another file', async function(){
+    var events = [];
+    flow.on('catch-all', ({detail: [event_name]}) => {
+      events.push(event_name);
+    });
+    await flow.addFile(new Blob(['file part']));
+    expect(flow.files.length).toBe(1);
+    expect(events).toEqual(['filter-file', 'file-added', 'files-added', 'files-submitted']);
+
+    var removedFile = flow.files[0];
+    flow.on('file-removed', ({detail: [file]}) => {
+        expect(file).toBe(removedFile);
+    });
+    await flow.addFile(new Blob(['file part 2']));
+    expect(flow.files.length).toBe(1);
+    expect(events.length).toBe(9);
+    expect(events.slice(-5)).toEqual(['filter-file', 'file-added', 'files-added', 'file-removed', 'files-submitted']);
+  });
+});
diff --git a/test/uploadSpec.js b/test/uploadSpec.js
index 54a4af2..8f2a60f 100644
--- a/test/uploadSpec.js
+++ b/test/uploadSpec.js
@@ -32,16 +32,16 @@ describe('upload file', function() {
     xhr.restore();
   });
 
-  it('should pass query params', function() {
+  it('should pass query params', async function() {
     flow.opts.query = {};
     flow.opts.target = 'file';
-    flow.addFile(new Blob(['123']));
-    flow.upload();
+    await flow.addFile(new Blob(['123']));
+    await flow.upload();
     expect(xhr.requests.length).toBe(1);
     expect(xhr.requests[0].url).toContain('file');
 
     flow.opts.query = {a:1};
-    flow.files[0].retry();
+    await flow.files[0].retry();
     expect(xhr.requests.length).toBe(2);
     expect(xhr.requests[1].url).toContain('file');
     expect(xhr.requests[1].url).toContain('a=1');
@@ -51,7 +51,7 @@ describe('upload file', function() {
       expect(chunk).toBe(flow.files[0].chunks[0]);
       return {b:2};
     };
-    flow.files[0].retry();
+    await flow.files[0].retry();
     expect(xhr.requests.length).toBe(3);
     expect(xhr.requests[2].url).toContain('file');
     expect(xhr.requests[2].url).toContain('b=2');
@@ -59,19 +59,19 @@ describe('upload file', function() {
 
     flow.opts.target = 'file?w=w';
     flow.opts.query = {};
-    flow.files[0].retry();
+    await flow.files[0].retry();
     expect(xhr.requests.length).toBe(4);
     expect(xhr.requests[3].url).toContain('file?w=w&');
     expect(xhr.requests[3].url).not.toContain('a=1');
     expect(xhr.requests[3].url).not.toContain('b=2');
   });
 
-  it('should track file upload status with lots of chunks', function() {
+  it('should track file upload status with lots of chunks', async function() {
     flow.opts.chunkSize = 1;
-    flow.addFile(new Blob(['IIIIIIIIII']));
+    await flow.addFile(new Blob(['IIIIIIIIII']));
     var file = flow.files[0];
     expect(file.chunks.length).toBe(10);
-    flow.upload();
+    await flow.upload();
     expect(file.progress()).toBe(0);
     for (var i = 0; i < 9; i++) {
       expect(xhr.requests[i]).toBeDefined();
@@ -93,17 +93,17 @@ describe('upload file', function() {
     expect(flow.progress()).toBe(1);
   });
 
-  it('should throw expected events', function () {
+  it('should throw expected events', async function () {
     var events = [],
         evl = 0;
     flow.on('catch-all', ({detail: [event_name]}) => {
       events.push(event_name);
     });
     flow.opts.chunkSize = 1;
-    flow.addFile(new Blob(['12']));
+    await flow.addFile(new Blob(['12']));
     var file = flow.files[0];
     expect(file.chunks.length).toBe(2);
-    flow.upload();
+    await flow.upload();
     // Sync events
     expect(events).toEqual(['filter-file', 'file-added', 'files-added', 'files-submitted', 'upload-start']);
     // Async
@@ -119,21 +119,21 @@ describe('upload file', function() {
     expect(events.length).toBe(15);
     expect(events.slice(-4)).toEqual(['file-progress', 'progress', 'file-success', 'complete']);
 
-    flow.upload();
+    await flow.upload();
     expect(events.length).toBe(17);
     expect(events.slice(-2)).toEqual(['upload-start', 'complete']);
   });
 
-  it('should pause and resume file', function () {
+  it('should pause and resume file', async function () {
     flow.opts.chunkSize = 1;
     flow.opts.simultaneousUploads = 2;
     flow.opts.testChunks = false;
-    flow.addFile(new Blob(['1234']));
-    flow.addFile(new Blob(['56']));
+    await flow.addFile(new Blob(['1234']));
+    await flow.addFile(new Blob(['56']));
     var files = flow.files;
     expect(files[0].chunks.length).toBe(4);
     expect(files[1].chunks.length).toBe(2);
-    flow.upload();
+    await flow.upload();
     expect(files[0].isUploading()).toBeTruthy();
     expect(xhr.requests.length).toBe(2);
     expect(xhr.requests[0].aborted).toBeUndefined();
@@ -178,7 +178,7 @@ describe('upload file', function() {
     expect(flow.progress()).toBe(1);
   });
 
-  it('should retry file', function () {
+  it('should retry file', async function () {
     flow.opts.testChunks = false;
     flow.opts.chunkSize = 1;
     flow.opts.simultaneousUploads = 1;
@@ -193,7 +193,7 @@ describe('upload file', function() {
     flow.on('file-success', success);
     flow.on('file-retry', retry);
 
-    flow.addFile(new Blob(['12']));
+    await flow.addFile(new Blob(['12']));
     var file = flow.files[0];
     expect(file.chunks.length).toBe(2);
     var firstChunk = file.chunks[0];
@@ -201,7 +201,7 @@ describe('upload file', function() {
     expect(firstChunk.status()).toBe('pending');
     expect(secondChunk.status()).toBe('pending');
 
-    flow.upload();
+    await flow.upload();
     expect(xhr.requests.length).toBe(1);
     expect(firstChunk.status()).toBe('uploading');
     expect(secondChunk.status()).toBe('pending');
@@ -257,7 +257,7 @@ describe('upload file', function() {
     expect(file.progress()).toBe(1);
   });
 
-  it('should retry file with timeout', function () {
+  it('should retry file with timeout', async function () {
     flow.opts.testChunks = false;
     flow.opts.maxChunkRetries = 1;
     flow.opts.chunkRetryInterval = 100;
@@ -269,9 +269,9 @@ describe('upload file', function() {
     flow.on('file-success', success);
     flow.on('file-retry', retry);
 
-    flow.addFile(new Blob(['12']));
+    await flow.addFile(new Blob(['12']));
     var file = flow.files[0];
-    flow.upload();
+    await flow.upload();
     expect(file.chunks[0].status()).toBe('uploading');
     expect(xhr.requests.length).toBe(1);
 
@@ -290,7 +290,7 @@ describe('upload file', function() {
     expect(retry).toHaveBeenCalled();
   });
 
-  it('should fail on permanent error', function () {
+  it('should fail on permanent error', async function () {
     xhr.autoRespond = false;
     flow.opts.testChunks = false;
     flow.opts.chunkSize = 1;
@@ -305,10 +305,10 @@ describe('upload file', function() {
     flow.on('file-success', success);
     flow.on('file-retry', retry);
 
-    flow.addFile(new Blob(['abc']));
+    await flow.addFile(new Blob(['abc']));
     var file = flow.files[0];
     expect(file.chunks.length).toBe(3);
-    flow.upload();
+    await flow.upload();
     expect(xhr.requests.length).toBe(2);
     xhr.requests[0].respond(500);
     expect(xhr.requests.length).toBe(2);
@@ -317,7 +317,7 @@ describe('upload file', function() {
     expect(success).not.toHaveBeenCalled();
   });
 
-  it('should fail on permanent test error', function () {
+  it('should fail on permanent test error', async function () {
     flow.opts.testChunks = true;
     flow.opts.chunkSize = 1;
     flow.opts.simultaneousUploads = 2;
@@ -331,8 +331,8 @@ describe('upload file', function() {
     flow.on('file-success', success);
     flow.on('file-retry', retry);
 
-    flow.addFile(new Blob(['abc']));
-    flow.upload();
+    await flow.addFile(new Blob(['abc']));
+    await flow.upload();
     expect(xhr.requests.length).toBe(2);
     xhr.requests[0].respond(500);
     expect(xhr.requests.length).toBe(2);
@@ -341,13 +341,13 @@ describe('upload file', function() {
     expect(success).not.toHaveBeenCalled();
   });
 
-  it('should upload empty file', function () {
+  it('should upload empty file', async function () {
     var error = jasmine.createSpy('error');
     var success = jasmine.createSpy('success');
     flow.on('file-error', error);
     flow.on('file-success', success);
 
-    flow.addFile(new Blob([]));
+    await flow.addFile(new Blob([]));
 
     // https://github.com/flowjs/flow.js/issues/55
     if (window.navigator.msPointerEnabled) {
@@ -355,7 +355,7 @@ describe('upload file', function() {
     } else {
       expect(flow.files.length, 1);
       var file = flow.files[0];
-      flow.upload();
+      await flow.upload();
       expect(xhr.requests.length).toBe(1);
       expect(file.progress()).toBe(0);
       xhr.requests[0].respond(200);
@@ -387,16 +387,16 @@ describe('upload file', function() {
     expect(flow.files.length).toBe(0);
   });
 
-  it('should preprocess chunks', function () {
+  it('should preprocess chunks', async function () {
     var preprocess = jasmine.createSpy('preprocess');
     var error = jasmine.createSpy('error');
     var success = jasmine.createSpy('success');
     flow.on('file-error', error);
     flow.on('file-success', success);
     flow.opts.preprocess = preprocess;
-    flow.addFile(new Blob(['abc']));
+    await flow.addFile(new Blob(['abc']));
     var file = flow.files[0];
-    flow.upload();
+    await flow.upload();
     expect(xhr.requests.length).toBe(0);
     expect(preprocess).toHaveBeenCalledWith(file.chunks[0]);
     expect(file.chunks[0].preprocessState).toBe(1);
@@ -407,24 +407,24 @@ describe('upload file', function() {
     expect(error).not.toHaveBeenCalled();
   });
 
-  it('should preprocess chunks and wait for preprocess to finish', function () {
+  it('should preprocess chunks and wait for preprocess to finish', async function () {
     flow.opts.simultaneousUploads = 1;
     var preprocess = jasmine.createSpy('preprocess');
     flow.opts.preprocess = preprocess;
-    flow.addFile(new Blob(['abc']));
-    flow.addFile(new Blob(['abca']));
+    await flow.addFile(new Blob(['abc']));
+    await flow.addFile(new Blob(['abca']));
     var file = flow.files[0];
     var secondFile = flow.files[1];
-    flow.upload();
+    await flow.upload();
     expect(xhr.requests.length).toBe(0);
     expect(preprocess).toHaveBeenCalledWith(file.chunks[0]);
     expect(preprocess).not.toHaveBeenCalledWith(secondFile.chunks[0]);
 
-    flow.upload();
+    await flow.upload();
     expect(preprocess).not.toHaveBeenCalledWith(secondFile.chunks[0]);
   });
 
-  it('should resume preprocess chunks after pause', function () {
+  it('should resume preprocess chunks after pause', async function () {
     flow.opts.chunkSize = 1;
     flow.opts.simultaneousUploads = 1;
     flow.opts.testChunks = false;
@@ -434,9 +434,9 @@ describe('upload file', function() {
     flow.on('file-error', error);
     flow.on('file-success', success);
     flow.opts.preprocess = preprocess;
-    flow.addFile(new Blob(['abc']));
+    await flow.addFile(new Blob(['abc']));
     var file = flow.files[0];
-    flow.upload();
+    await flow.upload();
     for(var i=0; i<file.chunks.length; i++) {
       expect(preprocess).toHaveBeenCalledWith(file.chunks[i]);
       file.chunks[i].preprocessFinished();
@@ -448,26 +448,26 @@ describe('upload file', function() {
     expect(error).not.toHaveBeenCalled();
   });
 
-  it('should set chunk as a third event parameter', function () {
+  it('should set chunk as a third event parameter', async function () {
     var success = jasmine.createSpy('success');
     flow.on('file-success', success);
-    flow.addFile(new Blob(['abc']));
+    await flow.addFile(new Blob(['abc']));
     var file = flow.files[0];
-    flow.upload();
+    await flow.upload();
     xhr.requests[0].respond(200, [], "response");
 
     expect(success).toHaveBeenCalledWith(asCustomEvent(file, "response", file.chunks[0]));
   });
 
-  it('should have upload speed', function() {
+  it('should have upload speed', async function() {
     var clock = sinon.useFakeTimers();
     flow.opts.testChunks = false;
     flow.opts.speedSmoothingFactor = 0.5;
     flow.opts.simultaneousUploads = 1;
     var fileProgress = jasmine.createSpy('file-progress');
     flow.on('file-progress', fileProgress);
-    flow.addFile(new Blob(['0123456789']));
-    flow.addFile(new Blob(['12345']));
+    await flow.addFile(new Blob(['0123456789']));
+    await flow.addFile(new Blob(['12345']));
     var fileFirst = flow.files[0];
     var fileSecond = flow.files[1];
     expect(fileFirst.currentSpeed).toBe(0);
@@ -476,7 +476,7 @@ describe('upload file', function() {
     expect(fileFirst.timeRemaining()).toBe(Number.POSITIVE_INFINITY);
     expect(flow.sizeUploaded()).toBe(0);
     expect(flow.timeRemaining()).toBe(Number.POSITIVE_INFINITY);
-    flow.upload();
+    await flow.upload();
 
     clock.tick(1000);
     xhr.requests[0].uploadProgress({loaded: 50, total: 100});
@@ -507,10 +507,10 @@ describe('upload file', function() {
     expect(flow.timeRemaining()).toBe(0);
 
     // paused and resumed
-    flow.addFile(new Blob(['012345678901234']));
+    await flow.addFile(new Blob(['012345678901234']));
     var fileThird = flow.files[2];
     expect(fileThird.timeRemaining()).toBe(Number.POSITIVE_INFINITY);
-    flow.upload();
+    await flow.upload();
     clock.tick(1000);
     xhr.requests[2].uploadProgress({loaded: 10, total: 15});
     expect(fileThird.timeRemaining()).toBe(1);
@@ -537,7 +537,7 @@ describe('upload file', function() {
     expect(flow.timeRemaining()).toBe(0);
   });
 
-  it('should allow to hook initFileFn and readFileFn', function () {
+  it('should allow to hook initFileFn and readFileFn', async function () {
     var error = jasmine.createSpy('error');
     var success = jasmine.createSpy('success');
     flow.on('file-error', error);
@@ -562,9 +562,9 @@ describe('upload file', function() {
       chunk.readFinished('X');
     }
 
-    flow.addFile(new Blob(['0123456789']));
+    await flow.addFile(new Blob(['0123456789']));
 
-    flow.upload();
+    await flow.upload();
 
     expect(xhr.requests.length).toBe(6);
 
@@ -580,7 +580,7 @@ describe('upload file', function() {
     expect(xhr.requests.length).toBe(6);
   });
 
-  it('should allow to hook initFileFn function', function() {
+  it('should allow to hook initFileFn function', async function() {
     var content = gen_file(6, 128),
         sample_file = new File([content], `foobar-initFileFn.bin`),
         customFunction = jasmine.createSpy('fn'),
@@ -591,7 +591,7 @@ describe('upload file', function() {
     flow.opts.testChunks = false;
     flow.opts.initFileFn = initFileFunction;
     flow.opts.chunkSize = 64;
-    flow.addFile(sample_file);
+    await flow.addFile(sample_file);
     expect(customFunction).toHaveBeenCalledTimes(1);
 
     flow.on('complete', async () => {
@@ -603,7 +603,7 @@ describe('upload file', function() {
     xhr.respondImmediately = xhr.autoRespond = true;
 
     flow.opts.simultaneousUploads = 3;
-    flow.upload();
+    await flow.upload();
     jasmine.clock().tick(1);
   });
 });
diff --git a/test/webKitDataTransferSpec.js b/test/webKitDataTransferSpec.js
index b6b9e48..b11a65e 100644
--- a/test/webKitDataTransferSpec.js
+++ b/test/webKitDataTransferSpec.js
@@ -144,4 +144,4 @@ describe('webKitDataTransfer', function () {
       event
     );
   });
-});
\ No newline at end of file
+});