diff --git a/README.md b/README.md
index a1e057f..e5df8dd 100644
--- a/README.md
+++ b/README.md
@@ -20,6 +20,7 @@ While the action allows many stages to be pushed to the registry for future re-u
 | `stages` | **yes** | | Comma-separarted list of build stages. Each of these will be an explicit cache target for subsequent builds |
 | `server-stage` | **yes** | | Name of stage for server |
 | `tag-latest-on-default` | no | `true` | Automatically create a `latest` tag when run on the default branch |
+| `custom-tag` | no | ` ` | A user-defined tag to apply to successfully built and pushed images |
 | `testenv-stage` | no | | Name of stage for test environment |
 | `context` | no | `.` | Build context |
 | `dockerfile` | no | `Dockerfile` | Path to the Dockerfile |
diff --git a/action.yml b/action.yml
index 902d3bd..b683180 100644
--- a/action.yml
+++ b/action.yml
@@ -34,6 +34,10 @@ inputs:
     default: true
     description: Automatically create a "latest" tag when the action is run on the default branch (defaults to `true`)
     required: false
+  custom-tag:
+    default: ''
+    required: false
+    description: A user-defined tag to apply to successfully built and pushed images
   testenv-stage:
     required: false
     description: Docker target for testing
diff --git a/dist/index.js b/dist/index.js
index 4522087..d9b15ef 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -9405,1303 +9405,1303 @@ exports.parseURL = __nccwpck_require__(2158).parseURL;
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
 "use strict";
-
-const punycode = __nccwpck_require__(5477);
-const tr46 = __nccwpck_require__(4256);
-
-const specialSchemes = {
-  ftp: 21,
-  file: null,
-  gopher: 70,
-  http: 80,
-  https: 443,
-  ws: 80,
-  wss: 443
-};
-
-const failure = Symbol("failure");
-
-function countSymbols(str) {
-  return punycode.ucs2.decode(str).length;
-}
-
-function at(input, idx) {
-  const c = input[idx];
-  return isNaN(c) ? undefined : String.fromCodePoint(c);
-}
-
-function isASCIIDigit(c) {
-  return c >= 0x30 && c <= 0x39;
-}
-
-function isASCIIAlpha(c) {
-  return (c >= 0x41 && c <= 0x5A) || (c >= 0x61 && c <= 0x7A);
-}
-
-function isASCIIAlphanumeric(c) {
-  return isASCIIAlpha(c) || isASCIIDigit(c);
-}
-
-function isASCIIHex(c) {
-  return isASCIIDigit(c) || (c >= 0x41 && c <= 0x46) || (c >= 0x61 && c <= 0x66);
-}
-
-function isSingleDot(buffer) {
-  return buffer === "." || buffer.toLowerCase() === "%2e";
-}
-
-function isDoubleDot(buffer) {
-  buffer = buffer.toLowerCase();
-  return buffer === ".." || buffer === "%2e." || buffer === ".%2e" || buffer === "%2e%2e";
-}
-
-function isWindowsDriveLetterCodePoints(cp1, cp2) {
-  return isASCIIAlpha(cp1) && (cp2 === 58 || cp2 === 124);
-}
-
-function isWindowsDriveLetterString(string) {
-  return string.length === 2 && isASCIIAlpha(string.codePointAt(0)) && (string[1] === ":" || string[1] === "|");
-}
-
-function isNormalizedWindowsDriveLetterString(string) {
-  return string.length === 2 && isASCIIAlpha(string.codePointAt(0)) && string[1] === ":";
-}
-
-function containsForbiddenHostCodePoint(string) {
-  return string.search(/\u0000|\u0009|\u000A|\u000D|\u0020|#|%|\/|:|\?|@|\[|\\|\]/) !== -1;
-}
-
-function containsForbiddenHostCodePointExcludingPercent(string) {
-  return string.search(/\u0000|\u0009|\u000A|\u000D|\u0020|#|\/|:|\?|@|\[|\\|\]/) !== -1;
-}
-
-function isSpecialScheme(scheme) {
-  return specialSchemes[scheme] !== undefined;
-}
-
-function isSpecial(url) {
-  return isSpecialScheme(url.scheme);
-}
-
-function defaultPort(scheme) {
-  return specialSchemes[scheme];
-}
-
-function percentEncode(c) {
-  let hex = c.toString(16).toUpperCase();
-  if (hex.length === 1) {
-    hex = "0" + hex;
-  }
-
-  return "%" + hex;
-}
-
-function utf8PercentEncode(c) {
-  const buf = new Buffer(c);
-
-  let str = "";
-
-  for (let i = 0; i < buf.length; ++i) {
-    str += percentEncode(buf[i]);
-  }
-
-  return str;
-}
-
-function utf8PercentDecode(str) {
-  const input = new Buffer(str);
-  const output = [];
-  for (let i = 0; i < input.length; ++i) {
-    if (input[i] !== 37) {
-      output.push(input[i]);
-    } else if (input[i] === 37 && isASCIIHex(input[i + 1]) && isASCIIHex(input[i + 2])) {
-      output.push(parseInt(input.slice(i + 1, i + 3).toString(), 16));
-      i += 2;
-    } else {
-      output.push(input[i]);
-    }
-  }
-  return new Buffer(output).toString();
-}
-
-function isC0ControlPercentEncode(c) {
-  return c <= 0x1F || c > 0x7E;
-}
-
-const extraPathPercentEncodeSet = new Set([32, 34, 35, 60, 62, 63, 96, 123, 125]);
-function isPathPercentEncode(c) {
-  return isC0ControlPercentEncode(c) || extraPathPercentEncodeSet.has(c);
-}
-
-const extraUserinfoPercentEncodeSet =
-  new Set([47, 58, 59, 61, 64, 91, 92, 93, 94, 124]);
-function isUserinfoPercentEncode(c) {
-  return isPathPercentEncode(c) || extraUserinfoPercentEncodeSet.has(c);
-}
-
-function percentEncodeChar(c, encodeSetPredicate) {
-  const cStr = String.fromCodePoint(c);
-
-  if (encodeSetPredicate(c)) {
-    return utf8PercentEncode(cStr);
-  }
-
-  return cStr;
-}
-
-function parseIPv4Number(input) {
-  let R = 10;
-
-  if (input.length >= 2 && input.charAt(0) === "0" && input.charAt(1).toLowerCase() === "x") {
-    input = input.substring(2);
-    R = 16;
-  } else if (input.length >= 2 && input.charAt(0) === "0") {
-    input = input.substring(1);
-    R = 8;
-  }
-
-  if (input === "") {
-    return 0;
-  }
-
-  const regex = R === 10 ? /[^0-9]/ : (R === 16 ? /[^0-9A-Fa-f]/ : /[^0-7]/);
-  if (regex.test(input)) {
-    return failure;
-  }
-
-  return parseInt(input, R);
-}
-
-function parseIPv4(input) {
-  const parts = input.split(".");
-  if (parts[parts.length - 1] === "") {
-    if (parts.length > 1) {
-      parts.pop();
-    }
-  }
-
-  if (parts.length > 4) {
-    return input;
-  }
-
-  const numbers = [];
-  for (const part of parts) {
-    if (part === "") {
-      return input;
-    }
-    const n = parseIPv4Number(part);
-    if (n === failure) {
-      return input;
-    }
-
-    numbers.push(n);
-  }
-
-  for (let i = 0; i < numbers.length - 1; ++i) {
-    if (numbers[i] > 255) {
-      return failure;
-    }
-  }
-  if (numbers[numbers.length - 1] >= Math.pow(256, 5 - numbers.length)) {
-    return failure;
-  }
-
-  let ipv4 = numbers.pop();
-  let counter = 0;
-
-  for (const n of numbers) {
-    ipv4 += n * Math.pow(256, 3 - counter);
-    ++counter;
-  }
-
-  return ipv4;
-}
-
-function serializeIPv4(address) {
-  let output = "";
-  let n = address;
-
-  for (let i = 1; i <= 4; ++i) {
-    output = String(n % 256) + output;
-    if (i !== 4) {
-      output = "." + output;
-    }
-    n = Math.floor(n / 256);
-  }
-
-  return output;
-}
-
-function parseIPv6(input) {
-  const address = [0, 0, 0, 0, 0, 0, 0, 0];
-  let pieceIndex = 0;
-  let compress = null;
-  let pointer = 0;
-
-  input = punycode.ucs2.decode(input);
-
-  if (input[pointer] === 58) {
-    if (input[pointer + 1] !== 58) {
-      return failure;
-    }
-
-    pointer += 2;
-    ++pieceIndex;
-    compress = pieceIndex;
-  }
-
-  while (pointer < input.length) {
-    if (pieceIndex === 8) {
-      return failure;
-    }
-
-    if (input[pointer] === 58) {
-      if (compress !== null) {
-        return failure;
-      }
-      ++pointer;
-      ++pieceIndex;
-      compress = pieceIndex;
-      continue;
-    }
-
-    let value = 0;
-    let length = 0;
-
-    while (length < 4 && isASCIIHex(input[pointer])) {
-      value = value * 0x10 + parseInt(at(input, pointer), 16);
-      ++pointer;
-      ++length;
-    }
-
-    if (input[pointer] === 46) {
-      if (length === 0) {
-        return failure;
-      }
-
-      pointer -= length;
-
-      if (pieceIndex > 6) {
-        return failure;
-      }
-
-      let numbersSeen = 0;
-
-      while (input[pointer] !== undefined) {
-        let ipv4Piece = null;
-
-        if (numbersSeen > 0) {
-          if (input[pointer] === 46 && numbersSeen < 4) {
-            ++pointer;
-          } else {
-            return failure;
-          }
-        }
-
-        if (!isASCIIDigit(input[pointer])) {
-          return failure;
-        }
-
-        while (isASCIIDigit(input[pointer])) {
-          const number = parseInt(at(input, pointer));
-          if (ipv4Piece === null) {
-            ipv4Piece = number;
-          } else if (ipv4Piece === 0) {
-            return failure;
-          } else {
-            ipv4Piece = ipv4Piece * 10 + number;
-          }
-          if (ipv4Piece > 255) {
-            return failure;
-          }
-          ++pointer;
-        }
-
-        address[pieceIndex] = address[pieceIndex] * 0x100 + ipv4Piece;
-
-        ++numbersSeen;
-
-        if (numbersSeen === 2 || numbersSeen === 4) {
-          ++pieceIndex;
-        }
-      }
-
-      if (numbersSeen !== 4) {
-        return failure;
-      }
-
-      break;
-    } else if (input[pointer] === 58) {
-      ++pointer;
-      if (input[pointer] === undefined) {
-        return failure;
-      }
-    } else if (input[pointer] !== undefined) {
-      return failure;
-    }
-
-    address[pieceIndex] = value;
-    ++pieceIndex;
-  }
-
-  if (compress !== null) {
-    let swaps = pieceIndex - compress;
-    pieceIndex = 7;
-    while (pieceIndex !== 0 && swaps > 0) {
-      const temp = address[compress + swaps - 1];
-      address[compress + swaps - 1] = address[pieceIndex];
-      address[pieceIndex] = temp;
-      --pieceIndex;
-      --swaps;
-    }
-  } else if (compress === null && pieceIndex !== 8) {
-    return failure;
-  }
-
-  return address;
-}
-
-function serializeIPv6(address) {
-  let output = "";
-  const seqResult = findLongestZeroSequence(address);
-  const compress = seqResult.idx;
-  let ignore0 = false;
-
-  for (let pieceIndex = 0; pieceIndex <= 7; ++pieceIndex) {
-    if (ignore0 && address[pieceIndex] === 0) {
-      continue;
-    } else if (ignore0) {
-      ignore0 = false;
-    }
-
-    if (compress === pieceIndex) {
-      const separator = pieceIndex === 0 ? "::" : ":";
-      output += separator;
-      ignore0 = true;
-      continue;
-    }
-
-    output += address[pieceIndex].toString(16);
-
-    if (pieceIndex !== 7) {
-      output += ":";
-    }
-  }
-
-  return output;
-}
-
-function parseHost(input, isSpecialArg) {
-  if (input[0] === "[") {
-    if (input[input.length - 1] !== "]") {
-      return failure;
-    }
-
-    return parseIPv6(input.substring(1, input.length - 1));
-  }
-
-  if (!isSpecialArg) {
-    return parseOpaqueHost(input);
-  }
-
-  const domain = utf8PercentDecode(input);
-  const asciiDomain = tr46.toASCII(domain, false, tr46.PROCESSING_OPTIONS.NONTRANSITIONAL, false);
-  if (asciiDomain === null) {
-    return failure;
-  }
-
-  if (containsForbiddenHostCodePoint(asciiDomain)) {
-    return failure;
-  }
-
-  const ipv4Host = parseIPv4(asciiDomain);
-  if (typeof ipv4Host === "number" || ipv4Host === failure) {
-    return ipv4Host;
-  }
-
-  return asciiDomain;
-}
-
-function parseOpaqueHost(input) {
-  if (containsForbiddenHostCodePointExcludingPercent(input)) {
-    return failure;
-  }
-
-  let output = "";
-  const decoded = punycode.ucs2.decode(input);
-  for (let i = 0; i < decoded.length; ++i) {
-    output += percentEncodeChar(decoded[i], isC0ControlPercentEncode);
-  }
-  return output;
-}
-
-function findLongestZeroSequence(arr) {
-  let maxIdx = null;
-  let maxLen = 1; // only find elements > 1
-  let currStart = null;
-  let currLen = 0;
-
-  for (let i = 0; i < arr.length; ++i) {
-    if (arr[i] !== 0) {
-      if (currLen > maxLen) {
-        maxIdx = currStart;
-        maxLen = currLen;
-      }
-
-      currStart = null;
-      currLen = 0;
-    } else {
-      if (currStart === null) {
-        currStart = i;
-      }
-      ++currLen;
-    }
-  }
-
-  // if trailing zeros
-  if (currLen > maxLen) {
-    maxIdx = currStart;
-    maxLen = currLen;
-  }
-
-  return {
-    idx: maxIdx,
-    len: maxLen
-  };
-}
-
-function serializeHost(host) {
-  if (typeof host === "number") {
-    return serializeIPv4(host);
-  }
-
-  // IPv6 serializer
-  if (host instanceof Array) {
-    return "[" + serializeIPv6(host) + "]";
-  }
-
-  return host;
-}
-
-function trimControlChars(url) {
-  return url.replace(/^[\u0000-\u001F\u0020]+|[\u0000-\u001F\u0020]+$/g, "");
-}
-
-function trimTabAndNewline(url) {
-  return url.replace(/\u0009|\u000A|\u000D/g, "");
-}
-
-function shortenPath(url) {
-  const path = url.path;
-  if (path.length === 0) {
-    return;
-  }
-  if (url.scheme === "file" && path.length === 1 && isNormalizedWindowsDriveLetter(path[0])) {
-    return;
-  }
-
-  path.pop();
-}
-
-function includesCredentials(url) {
-  return url.username !== "" || url.password !== "";
-}
-
-function cannotHaveAUsernamePasswordPort(url) {
-  return url.host === null || url.host === "" || url.cannotBeABaseURL || url.scheme === "file";
-}
-
-function isNormalizedWindowsDriveLetter(string) {
-  return /^[A-Za-z]:$/.test(string);
-}
-
-function URLStateMachine(input, base, encodingOverride, url, stateOverride) {
-  this.pointer = 0;
-  this.input = input;
-  this.base = base || null;
-  this.encodingOverride = encodingOverride || "utf-8";
-  this.stateOverride = stateOverride;
-  this.url = url;
-  this.failure = false;
-  this.parseError = false;
-
-  if (!this.url) {
-    this.url = {
-      scheme: "",
-      username: "",
-      password: "",
-      host: null,
-      port: null,
-      path: [],
-      query: null,
-      fragment: null,
-
-      cannotBeABaseURL: false
-    };
-
-    const res = trimControlChars(this.input);
-    if (res !== this.input) {
-      this.parseError = true;
-    }
-    this.input = res;
-  }
-
-  const res = trimTabAndNewline(this.input);
-  if (res !== this.input) {
-    this.parseError = true;
-  }
-  this.input = res;
-
-  this.state = stateOverride || "scheme start";
-
-  this.buffer = "";
-  this.atFlag = false;
-  this.arrFlag = false;
-  this.passwordTokenSeenFlag = false;
-
-  this.input = punycode.ucs2.decode(this.input);
-
-  for (; this.pointer <= this.input.length; ++this.pointer) {
-    const c = this.input[this.pointer];
-    const cStr = isNaN(c) ? undefined : String.fromCodePoint(c);
-
-    // exec state machine
-    const ret = this["parse " + this.state](c, cStr);
-    if (!ret) {
-      break; // terminate algorithm
-    } else if (ret === failure) {
-      this.failure = true;
-      break;
-    }
-  }
-}
-
-URLStateMachine.prototype["parse scheme start"] = function parseSchemeStart(c, cStr) {
-  if (isASCIIAlpha(c)) {
-    this.buffer += cStr.toLowerCase();
-    this.state = "scheme";
-  } else if (!this.stateOverride) {
-    this.state = "no scheme";
-    --this.pointer;
-  } else {
-    this.parseError = true;
-    return failure;
-  }
-
-  return true;
-};
-
-URLStateMachine.prototype["parse scheme"] = function parseScheme(c, cStr) {
-  if (isASCIIAlphanumeric(c) || c === 43 || c === 45 || c === 46) {
-    this.buffer += cStr.toLowerCase();
-  } else if (c === 58) {
-    if (this.stateOverride) {
-      if (isSpecial(this.url) && !isSpecialScheme(this.buffer)) {
-        return false;
-      }
-
-      if (!isSpecial(this.url) && isSpecialScheme(this.buffer)) {
-        return false;
-      }
-
-      if ((includesCredentials(this.url) || this.url.port !== null) && this.buffer === "file") {
-        return false;
-      }
-
-      if (this.url.scheme === "file" && (this.url.host === "" || this.url.host === null)) {
-        return false;
-      }
-    }
-    this.url.scheme = this.buffer;
-    this.buffer = "";
-    if (this.stateOverride) {
-      return false;
-    }
-    if (this.url.scheme === "file") {
-      if (this.input[this.pointer + 1] !== 47 || this.input[this.pointer + 2] !== 47) {
-        this.parseError = true;
-      }
-      this.state = "file";
-    } else if (isSpecial(this.url) && this.base !== null && this.base.scheme === this.url.scheme) {
-      this.state = "special relative or authority";
-    } else if (isSpecial(this.url)) {
-      this.state = "special authority slashes";
-    } else if (this.input[this.pointer + 1] === 47) {
-      this.state = "path or authority";
-      ++this.pointer;
-    } else {
-      this.url.cannotBeABaseURL = true;
-      this.url.path.push("");
-      this.state = "cannot-be-a-base-URL path";
-    }
-  } else if (!this.stateOverride) {
-    this.buffer = "";
-    this.state = "no scheme";
-    this.pointer = -1;
-  } else {
-    this.parseError = true;
-    return failure;
-  }
-
-  return true;
-};
-
-URLStateMachine.prototype["parse no scheme"] = function parseNoScheme(c) {
-  if (this.base === null || (this.base.cannotBeABaseURL && c !== 35)) {
-    return failure;
-  } else if (this.base.cannotBeABaseURL && c === 35) {
-    this.url.scheme = this.base.scheme;
-    this.url.path = this.base.path.slice();
-    this.url.query = this.base.query;
-    this.url.fragment = "";
-    this.url.cannotBeABaseURL = true;
-    this.state = "fragment";
-  } else if (this.base.scheme === "file") {
-    this.state = "file";
-    --this.pointer;
-  } else {
-    this.state = "relative";
-    --this.pointer;
-  }
-
-  return true;
-};
-
-URLStateMachine.prototype["parse special relative or authority"] = function parseSpecialRelativeOrAuthority(c) {
-  if (c === 47 && this.input[this.pointer + 1] === 47) {
-    this.state = "special authority ignore slashes";
-    ++this.pointer;
-  } else {
-    this.parseError = true;
-    this.state = "relative";
-    --this.pointer;
-  }
-
-  return true;
-};
-
-URLStateMachine.prototype["parse path or authority"] = function parsePathOrAuthority(c) {
-  if (c === 47) {
-    this.state = "authority";
-  } else {
-    this.state = "path";
-    --this.pointer;
-  }
-
-  return true;
-};
-
-URLStateMachine.prototype["parse relative"] = function parseRelative(c) {
-  this.url.scheme = this.base.scheme;
-  if (isNaN(c)) {
-    this.url.username = this.base.username;
-    this.url.password = this.base.password;
-    this.url.host = this.base.host;
-    this.url.port = this.base.port;
-    this.url.path = this.base.path.slice();
-    this.url.query = this.base.query;
-  } else if (c === 47) {
-    this.state = "relative slash";
-  } else if (c === 63) {
-    this.url.username = this.base.username;
-    this.url.password = this.base.password;
-    this.url.host = this.base.host;
-    this.url.port = this.base.port;
-    this.url.path = this.base.path.slice();
-    this.url.query = "";
-    this.state = "query";
-  } else if (c === 35) {
-    this.url.username = this.base.username;
-    this.url.password = this.base.password;
-    this.url.host = this.base.host;
-    this.url.port = this.base.port;
-    this.url.path = this.base.path.slice();
-    this.url.query = this.base.query;
-    this.url.fragment = "";
-    this.state = "fragment";
-  } else if (isSpecial(this.url) && c === 92) {
-    this.parseError = true;
-    this.state = "relative slash";
-  } else {
-    this.url.username = this.base.username;
-    this.url.password = this.base.password;
-    this.url.host = this.base.host;
-    this.url.port = this.base.port;
-    this.url.path = this.base.path.slice(0, this.base.path.length - 1);
-
-    this.state = "path";
-    --this.pointer;
-  }
-
-  return true;
-};
-
-URLStateMachine.prototype["parse relative slash"] = function parseRelativeSlash(c) {
-  if (isSpecial(this.url) && (c === 47 || c === 92)) {
-    if (c === 92) {
-      this.parseError = true;
-    }
-    this.state = "special authority ignore slashes";
-  } else if (c === 47) {
-    this.state = "authority";
-  } else {
-    this.url.username = this.base.username;
-    this.url.password = this.base.password;
-    this.url.host = this.base.host;
-    this.url.port = this.base.port;
-    this.state = "path";
-    --this.pointer;
-  }
-
-  return true;
-};
-
-URLStateMachine.prototype["parse special authority slashes"] = function parseSpecialAuthoritySlashes(c) {
-  if (c === 47 && this.input[this.pointer + 1] === 47) {
-    this.state = "special authority ignore slashes";
-    ++this.pointer;
-  } else {
-    this.parseError = true;
-    this.state = "special authority ignore slashes";
-    --this.pointer;
-  }
-
-  return true;
-};
-
-URLStateMachine.prototype["parse special authority ignore slashes"] = function parseSpecialAuthorityIgnoreSlashes(c) {
-  if (c !== 47 && c !== 92) {
-    this.state = "authority";
-    --this.pointer;
-  } else {
-    this.parseError = true;
-  }
-
-  return true;
-};
-
-URLStateMachine.prototype["parse authority"] = function parseAuthority(c, cStr) {
-  if (c === 64) {
-    this.parseError = true;
-    if (this.atFlag) {
-      this.buffer = "%40" + this.buffer;
-    }
-    this.atFlag = true;
-
-    // careful, this is based on buffer and has its own pointer (this.pointer != pointer) and inner chars
-    const len = countSymbols(this.buffer);
-    for (let pointer = 0; pointer < len; ++pointer) {
-      const codePoint = this.buffer.codePointAt(pointer);
-
-      if (codePoint === 58 && !this.passwordTokenSeenFlag) {
-        this.passwordTokenSeenFlag = true;
-        continue;
-      }
-      const encodedCodePoints = percentEncodeChar(codePoint, isUserinfoPercentEncode);
-      if (this.passwordTokenSeenFlag) {
-        this.url.password += encodedCodePoints;
-      } else {
-        this.url.username += encodedCodePoints;
-      }
-    }
-    this.buffer = "";
-  } else if (isNaN(c) || c === 47 || c === 63 || c === 35 ||
-             (isSpecial(this.url) && c === 92)) {
-    if (this.atFlag && this.buffer === "") {
-      this.parseError = true;
-      return failure;
-    }
-    this.pointer -= countSymbols(this.buffer) + 1;
-    this.buffer = "";
-    this.state = "host";
-  } else {
-    this.buffer += cStr;
-  }
-
-  return true;
-};
-
-URLStateMachine.prototype["parse hostname"] =
-URLStateMachine.prototype["parse host"] = function parseHostName(c, cStr) {
-  if (this.stateOverride && this.url.scheme === "file") {
-    --this.pointer;
-    this.state = "file host";
-  } else if (c === 58 && !this.arrFlag) {
-    if (this.buffer === "") {
-      this.parseError = true;
-      return failure;
-    }
-
-    const host = parseHost(this.buffer, isSpecial(this.url));
-    if (host === failure) {
-      return failure;
-    }
-
-    this.url.host = host;
-    this.buffer = "";
-    this.state = "port";
-    if (this.stateOverride === "hostname") {
-      return false;
-    }
-  } else if (isNaN(c) || c === 47 || c === 63 || c === 35 ||
-             (isSpecial(this.url) && c === 92)) {
-    --this.pointer;
-    if (isSpecial(this.url) && this.buffer === "") {
-      this.parseError = true;
-      return failure;
-    } else if (this.stateOverride && this.buffer === "" &&
-               (includesCredentials(this.url) || this.url.port !== null)) {
-      this.parseError = true;
-      return false;
-    }
-
-    const host = parseHost(this.buffer, isSpecial(this.url));
-    if (host === failure) {
-      return failure;
-    }
-
-    this.url.host = host;
-    this.buffer = "";
-    this.state = "path start";
-    if (this.stateOverride) {
-      return false;
-    }
-  } else {
-    if (c === 91) {
-      this.arrFlag = true;
-    } else if (c === 93) {
-      this.arrFlag = false;
-    }
-    this.buffer += cStr;
-  }
-
-  return true;
-};
-
-URLStateMachine.prototype["parse port"] = function parsePort(c, cStr) {
-  if (isASCIIDigit(c)) {
-    this.buffer += cStr;
-  } else if (isNaN(c) || c === 47 || c === 63 || c === 35 ||
-             (isSpecial(this.url) && c === 92) ||
-             this.stateOverride) {
-    if (this.buffer !== "") {
-      const port = parseInt(this.buffer);
-      if (port > Math.pow(2, 16) - 1) {
-        this.parseError = true;
-        return failure;
-      }
-      this.url.port = port === defaultPort(this.url.scheme) ? null : port;
-      this.buffer = "";
-    }
-    if (this.stateOverride) {
-      return false;
-    }
-    this.state = "path start";
-    --this.pointer;
-  } else {
-    this.parseError = true;
-    return failure;
-  }
-
-  return true;
-};
-
-const fileOtherwiseCodePoints = new Set([47, 92, 63, 35]);
-
-URLStateMachine.prototype["parse file"] = function parseFile(c) {
-  this.url.scheme = "file";
-
-  if (c === 47 || c === 92) {
-    if (c === 92) {
-      this.parseError = true;
-    }
-    this.state = "file slash";
-  } else if (this.base !== null && this.base.scheme === "file") {
-    if (isNaN(c)) {
-      this.url.host = this.base.host;
-      this.url.path = this.base.path.slice();
-      this.url.query = this.base.query;
-    } else if (c === 63) {
-      this.url.host = this.base.host;
-      this.url.path = this.base.path.slice();
-      this.url.query = "";
-      this.state = "query";
-    } else if (c === 35) {
-      this.url.host = this.base.host;
-      this.url.path = this.base.path.slice();
-      this.url.query = this.base.query;
-      this.url.fragment = "";
-      this.state = "fragment";
-    } else {
-      if (this.input.length - this.pointer - 1 === 0 || // remaining consists of 0 code points
-          !isWindowsDriveLetterCodePoints(c, this.input[this.pointer + 1]) ||
-          (this.input.length - this.pointer - 1 >= 2 && // remaining has at least 2 code points
-           !fileOtherwiseCodePoints.has(this.input[this.pointer + 2]))) {
-        this.url.host = this.base.host;
-        this.url.path = this.base.path.slice();
-        shortenPath(this.url);
-      } else {
-        this.parseError = true;
-      }
-
-      this.state = "path";
-      --this.pointer;
-    }
-  } else {
-    this.state = "path";
-    --this.pointer;
-  }
-
-  return true;
-};
-
-URLStateMachine.prototype["parse file slash"] = function parseFileSlash(c) {
-  if (c === 47 || c === 92) {
-    if (c === 92) {
-      this.parseError = true;
-    }
-    this.state = "file host";
-  } else {
-    if (this.base !== null && this.base.scheme === "file") {
-      if (isNormalizedWindowsDriveLetterString(this.base.path[0])) {
-        this.url.path.push(this.base.path[0]);
-      } else {
-        this.url.host = this.base.host;
-      }
-    }
-    this.state = "path";
-    --this.pointer;
-  }
-
-  return true;
-};
-
-URLStateMachine.prototype["parse file host"] = function parseFileHost(c, cStr) {
-  if (isNaN(c) || c === 47 || c === 92 || c === 63 || c === 35) {
-    --this.pointer;
-    if (!this.stateOverride && isWindowsDriveLetterString(this.buffer)) {
-      this.parseError = true;
-      this.state = "path";
-    } else if (this.buffer === "") {
-      this.url.host = "";
-      if (this.stateOverride) {
-        return false;
-      }
-      this.state = "path start";
-    } else {
-      let host = parseHost(this.buffer, isSpecial(this.url));
-      if (host === failure) {
-        return failure;
-      }
-      if (host === "localhost") {
-        host = "";
-      }
-      this.url.host = host;
-
-      if (this.stateOverride) {
-        return false;
-      }
-
-      this.buffer = "";
-      this.state = "path start";
-    }
-  } else {
-    this.buffer += cStr;
-  }
-
-  return true;
-};
-
-URLStateMachine.prototype["parse path start"] = function parsePathStart(c) {
-  if (isSpecial(this.url)) {
-    if (c === 92) {
-      this.parseError = true;
-    }
-    this.state = "path";
-
-    if (c !== 47 && c !== 92) {
-      --this.pointer;
-    }
-  } else if (!this.stateOverride && c === 63) {
-    this.url.query = "";
-    this.state = "query";
-  } else if (!this.stateOverride && c === 35) {
-    this.url.fragment = "";
-    this.state = "fragment";
-  } else if (c !== undefined) {
-    this.state = "path";
-    if (c !== 47) {
-      --this.pointer;
-    }
-  }
-
-  return true;
-};
-
-URLStateMachine.prototype["parse path"] = function parsePath(c) {
-  if (isNaN(c) || c === 47 || (isSpecial(this.url) && c === 92) ||
-      (!this.stateOverride && (c === 63 || c === 35))) {
-    if (isSpecial(this.url) && c === 92) {
-      this.parseError = true;
-    }
-
-    if (isDoubleDot(this.buffer)) {
-      shortenPath(this.url);
-      if (c !== 47 && !(isSpecial(this.url) && c === 92)) {
-        this.url.path.push("");
-      }
-    } else if (isSingleDot(this.buffer) && c !== 47 &&
-               !(isSpecial(this.url) && c === 92)) {
-      this.url.path.push("");
-    } else if (!isSingleDot(this.buffer)) {
-      if (this.url.scheme === "file" && this.url.path.length === 0 && isWindowsDriveLetterString(this.buffer)) {
-        if (this.url.host !== "" && this.url.host !== null) {
-          this.parseError = true;
-          this.url.host = "";
-        }
-        this.buffer = this.buffer[0] + ":";
-      }
-      this.url.path.push(this.buffer);
-    }
-    this.buffer = "";
-    if (this.url.scheme === "file" && (c === undefined || c === 63 || c === 35)) {
-      while (this.url.path.length > 1 && this.url.path[0] === "") {
-        this.parseError = true;
-        this.url.path.shift();
-      }
-    }
-    if (c === 63) {
-      this.url.query = "";
-      this.state = "query";
-    }
-    if (c === 35) {
-      this.url.fragment = "";
-      this.state = "fragment";
-    }
-  } else {
-    // TODO: If c is not a URL code point and not "%", parse error.
-
-    if (c === 37 &&
-      (!isASCIIHex(this.input[this.pointer + 1]) ||
-        !isASCIIHex(this.input[this.pointer + 2]))) {
-      this.parseError = true;
-    }
-
-    this.buffer += percentEncodeChar(c, isPathPercentEncode);
-  }
-
-  return true;
-};
-
-URLStateMachine.prototype["parse cannot-be-a-base-URL path"] = function parseCannotBeABaseURLPath(c) {
-  if (c === 63) {
-    this.url.query = "";
-    this.state = "query";
-  } else if (c === 35) {
-    this.url.fragment = "";
-    this.state = "fragment";
-  } else {
-    // TODO: Add: not a URL code point
-    if (!isNaN(c) && c !== 37) {
-      this.parseError = true;
-    }
-
-    if (c === 37 &&
-        (!isASCIIHex(this.input[this.pointer + 1]) ||
-         !isASCIIHex(this.input[this.pointer + 2]))) {
-      this.parseError = true;
-    }
-
-    if (!isNaN(c)) {
-      this.url.path[0] = this.url.path[0] + percentEncodeChar(c, isC0ControlPercentEncode);
-    }
-  }
-
-  return true;
-};
-
-URLStateMachine.prototype["parse query"] = function parseQuery(c, cStr) {
-  if (isNaN(c) || (!this.stateOverride && c === 35)) {
-    if (!isSpecial(this.url) || this.url.scheme === "ws" || this.url.scheme === "wss") {
-      this.encodingOverride = "utf-8";
-    }
-
-    const buffer = new Buffer(this.buffer); // TODO: Use encoding override instead
-    for (let i = 0; i < buffer.length; ++i) {
-      if (buffer[i] < 0x21 || buffer[i] > 0x7E || buffer[i] === 0x22 || buffer[i] === 0x23 ||
-          buffer[i] === 0x3C || buffer[i] === 0x3E) {
-        this.url.query += percentEncode(buffer[i]);
-      } else {
-        this.url.query += String.fromCodePoint(buffer[i]);
-      }
-    }
-
-    this.buffer = "";
-    if (c === 35) {
-      this.url.fragment = "";
-      this.state = "fragment";
-    }
-  } else {
-    // TODO: If c is not a URL code point and not "%", parse error.
-    if (c === 37 &&
-      (!isASCIIHex(this.input[this.pointer + 1]) ||
-        !isASCIIHex(this.input[this.pointer + 2]))) {
-      this.parseError = true;
-    }
-
-    this.buffer += cStr;
-  }
-
-  return true;
-};
-
-URLStateMachine.prototype["parse fragment"] = function parseFragment(c) {
-  if (isNaN(c)) { // do nothing
-  } else if (c === 0x0) {
-    this.parseError = true;
-  } else {
-    // TODO: If c is not a URL code point and not "%", parse error.
-    if (c === 37 &&
-      (!isASCIIHex(this.input[this.pointer + 1]) ||
-        !isASCIIHex(this.input[this.pointer + 2]))) {
-      this.parseError = true;
-    }
-
-    this.url.fragment += percentEncodeChar(c, isC0ControlPercentEncode);
-  }
-
-  return true;
-};
-
-function serializeURL(url, excludeFragment) {
-  let output = url.scheme + ":";
-  if (url.host !== null) {
-    output += "//";
-
-    if (url.username !== "" || url.password !== "") {
-      output += url.username;
-      if (url.password !== "") {
-        output += ":" + url.password;
-      }
-      output += "@";
-    }
-
-    output += serializeHost(url.host);
-
-    if (url.port !== null) {
-      output += ":" + url.port;
-    }
-  } else if (url.host === null && url.scheme === "file") {
-    output += "//";
-  }
-
-  if (url.cannotBeABaseURL) {
-    output += url.path[0];
-  } else {
-    for (const string of url.path) {
-      output += "/" + string;
-    }
-  }
-
-  if (url.query !== null) {
-    output += "?" + url.query;
-  }
-
-  if (!excludeFragment && url.fragment !== null) {
-    output += "#" + url.fragment;
-  }
-
-  return output;
-}
-
-function serializeOrigin(tuple) {
-  let result = tuple.scheme + "://";
-  result += serializeHost(tuple.host);
-
-  if (tuple.port !== null) {
-    result += ":" + tuple.port;
-  }
-
-  return result;
-}
-
-module.exports.serializeURL = serializeURL;
-
-module.exports.serializeURLOrigin = function (url) {
-  // https://url.spec.whatwg.org/#concept-url-origin
-  switch (url.scheme) {
-    case "blob":
-      try {
-        return module.exports.serializeURLOrigin(module.exports.parseURL(url.path[0]));
-      } catch (e) {
-        // serializing an opaque origin returns "null"
-        return "null";
-      }
-    case "ftp":
-    case "gopher":
-    case "http":
-    case "https":
-    case "ws":
-    case "wss":
-      return serializeOrigin({
-        scheme: url.scheme,
-        host: url.host,
-        port: url.port
-      });
-    case "file":
-      // spec says "exercise to the reader", chrome says "file://"
-      return "file://";
-    default:
-      // serializing an opaque origin returns "null"
-      return "null";
-  }
-};
-
-module.exports.basicURLParse = function (input, options) {
-  if (options === undefined) {
-    options = {};
-  }
-
-  const usm = new URLStateMachine(input, options.baseURL, options.encodingOverride, options.url, options.stateOverride);
-  if (usm.failure) {
-    return "failure";
-  }
-
-  return usm.url;
-};
-
-module.exports.setTheUsername = function (url, username) {
-  url.username = "";
-  const decoded = punycode.ucs2.decode(username);
-  for (let i = 0; i < decoded.length; ++i) {
-    url.username += percentEncodeChar(decoded[i], isUserinfoPercentEncode);
-  }
-};
-
-module.exports.setThePassword = function (url, password) {
-  url.password = "";
-  const decoded = punycode.ucs2.decode(password);
-  for (let i = 0; i < decoded.length; ++i) {
-    url.password += percentEncodeChar(decoded[i], isUserinfoPercentEncode);
-  }
-};
-
-module.exports.serializeHost = serializeHost;
-
-module.exports.cannotHaveAUsernamePasswordPort = cannotHaveAUsernamePasswordPort;
-
-module.exports.serializeInteger = function (integer) {
-  return String(integer);
-};
-
-module.exports.parseURL = function (input, options) {
-  if (options === undefined) {
-    options = {};
-  }
-
-  // We don't handle blobs, so this just delegates:
-  return module.exports.basicURLParse(input, { baseURL: options.baseURL, encodingOverride: options.encodingOverride });
-};
+
+const punycode = __nccwpck_require__(5477);
+const tr46 = __nccwpck_require__(4256);
+
+const specialSchemes = {
+  ftp: 21,
+  file: null,
+  gopher: 70,
+  http: 80,
+  https: 443,
+  ws: 80,
+  wss: 443
+};
+
+const failure = Symbol("failure");
+
+function countSymbols(str) {
+  return punycode.ucs2.decode(str).length;
+}
+
+function at(input, idx) {
+  const c = input[idx];
+  return isNaN(c) ? undefined : String.fromCodePoint(c);
+}
+
+function isASCIIDigit(c) {
+  return c >= 0x30 && c <= 0x39;
+}
+
+function isASCIIAlpha(c) {
+  return (c >= 0x41 && c <= 0x5A) || (c >= 0x61 && c <= 0x7A);
+}
+
+function isASCIIAlphanumeric(c) {
+  return isASCIIAlpha(c) || isASCIIDigit(c);
+}
+
+function isASCIIHex(c) {
+  return isASCIIDigit(c) || (c >= 0x41 && c <= 0x46) || (c >= 0x61 && c <= 0x66);
+}
+
+function isSingleDot(buffer) {
+  return buffer === "." || buffer.toLowerCase() === "%2e";
+}
+
+function isDoubleDot(buffer) {
+  buffer = buffer.toLowerCase();
+  return buffer === ".." || buffer === "%2e." || buffer === ".%2e" || buffer === "%2e%2e";
+}
+
+function isWindowsDriveLetterCodePoints(cp1, cp2) {
+  return isASCIIAlpha(cp1) && (cp2 === 58 || cp2 === 124);
+}
+
+function isWindowsDriveLetterString(string) {
+  return string.length === 2 && isASCIIAlpha(string.codePointAt(0)) && (string[1] === ":" || string[1] === "|");
+}
+
+function isNormalizedWindowsDriveLetterString(string) {
+  return string.length === 2 && isASCIIAlpha(string.codePointAt(0)) && string[1] === ":";
+}
+
+function containsForbiddenHostCodePoint(string) {
+  return string.search(/\u0000|\u0009|\u000A|\u000D|\u0020|#|%|\/|:|\?|@|\[|\\|\]/) !== -1;
+}
+
+function containsForbiddenHostCodePointExcludingPercent(string) {
+  return string.search(/\u0000|\u0009|\u000A|\u000D|\u0020|#|\/|:|\?|@|\[|\\|\]/) !== -1;
+}
+
+function isSpecialScheme(scheme) {
+  return specialSchemes[scheme] !== undefined;
+}
+
+function isSpecial(url) {
+  return isSpecialScheme(url.scheme);
+}
+
+function defaultPort(scheme) {
+  return specialSchemes[scheme];
+}
+
+function percentEncode(c) {
+  let hex = c.toString(16).toUpperCase();
+  if (hex.length === 1) {
+    hex = "0" + hex;
+  }
+
+  return "%" + hex;
+}
+
+function utf8PercentEncode(c) {
+  const buf = new Buffer(c);
+
+  let str = "";
+
+  for (let i = 0; i < buf.length; ++i) {
+    str += percentEncode(buf[i]);
+  }
+
+  return str;
+}
+
+function utf8PercentDecode(str) {
+  const input = new Buffer(str);
+  const output = [];
+  for (let i = 0; i < input.length; ++i) {
+    if (input[i] !== 37) {
+      output.push(input[i]);
+    } else if (input[i] === 37 && isASCIIHex(input[i + 1]) && isASCIIHex(input[i + 2])) {
+      output.push(parseInt(input.slice(i + 1, i + 3).toString(), 16));
+      i += 2;
+    } else {
+      output.push(input[i]);
+    }
+  }
+  return new Buffer(output).toString();
+}
+
+function isC0ControlPercentEncode(c) {
+  return c <= 0x1F || c > 0x7E;
+}
+
+const extraPathPercentEncodeSet = new Set([32, 34, 35, 60, 62, 63, 96, 123, 125]);
+function isPathPercentEncode(c) {
+  return isC0ControlPercentEncode(c) || extraPathPercentEncodeSet.has(c);
+}
+
+const extraUserinfoPercentEncodeSet =
+  new Set([47, 58, 59, 61, 64, 91, 92, 93, 94, 124]);
+function isUserinfoPercentEncode(c) {
+  return isPathPercentEncode(c) || extraUserinfoPercentEncodeSet.has(c);
+}
+
+function percentEncodeChar(c, encodeSetPredicate) {
+  const cStr = String.fromCodePoint(c);
+
+  if (encodeSetPredicate(c)) {
+    return utf8PercentEncode(cStr);
+  }
+
+  return cStr;
+}
+
+function parseIPv4Number(input) {
+  let R = 10;
+
+  if (input.length >= 2 && input.charAt(0) === "0" && input.charAt(1).toLowerCase() === "x") {
+    input = input.substring(2);
+    R = 16;
+  } else if (input.length >= 2 && input.charAt(0) === "0") {
+    input = input.substring(1);
+    R = 8;
+  }
+
+  if (input === "") {
+    return 0;
+  }
+
+  const regex = R === 10 ? /[^0-9]/ : (R === 16 ? /[^0-9A-Fa-f]/ : /[^0-7]/);
+  if (regex.test(input)) {
+    return failure;
+  }
+
+  return parseInt(input, R);
+}
+
+function parseIPv4(input) {
+  const parts = input.split(".");
+  if (parts[parts.length - 1] === "") {
+    if (parts.length > 1) {
+      parts.pop();
+    }
+  }
+
+  if (parts.length > 4) {
+    return input;
+  }
+
+  const numbers = [];
+  for (const part of parts) {
+    if (part === "") {
+      return input;
+    }
+    const n = parseIPv4Number(part);
+    if (n === failure) {
+      return input;
+    }
+
+    numbers.push(n);
+  }
+
+  for (let i = 0; i < numbers.length - 1; ++i) {
+    if (numbers[i] > 255) {
+      return failure;
+    }
+  }
+  if (numbers[numbers.length - 1] >= Math.pow(256, 5 - numbers.length)) {
+    return failure;
+  }
+
+  let ipv4 = numbers.pop();
+  let counter = 0;
+
+  for (const n of numbers) {
+    ipv4 += n * Math.pow(256, 3 - counter);
+    ++counter;
+  }
+
+  return ipv4;
+}
+
+function serializeIPv4(address) {
+  let output = "";
+  let n = address;
+
+  for (let i = 1; i <= 4; ++i) {
+    output = String(n % 256) + output;
+    if (i !== 4) {
+      output = "." + output;
+    }
+    n = Math.floor(n / 256);
+  }
+
+  return output;
+}
+
+function parseIPv6(input) {
+  const address = [0, 0, 0, 0, 0, 0, 0, 0];
+  let pieceIndex = 0;
+  let compress = null;
+  let pointer = 0;
+
+  input = punycode.ucs2.decode(input);
+
+  if (input[pointer] === 58) {
+    if (input[pointer + 1] !== 58) {
+      return failure;
+    }
+
+    pointer += 2;
+    ++pieceIndex;
+    compress = pieceIndex;
+  }
+
+  while (pointer < input.length) {
+    if (pieceIndex === 8) {
+      return failure;
+    }
+
+    if (input[pointer] === 58) {
+      if (compress !== null) {
+        return failure;
+      }
+      ++pointer;
+      ++pieceIndex;
+      compress = pieceIndex;
+      continue;
+    }
+
+    let value = 0;
+    let length = 0;
+
+    while (length < 4 && isASCIIHex(input[pointer])) {
+      value = value * 0x10 + parseInt(at(input, pointer), 16);
+      ++pointer;
+      ++length;
+    }
+
+    if (input[pointer] === 46) {
+      if (length === 0) {
+        return failure;
+      }
+
+      pointer -= length;
+
+      if (pieceIndex > 6) {
+        return failure;
+      }
+
+      let numbersSeen = 0;
+
+      while (input[pointer] !== undefined) {
+        let ipv4Piece = null;
+
+        if (numbersSeen > 0) {
+          if (input[pointer] === 46 && numbersSeen < 4) {
+            ++pointer;
+          } else {
+            return failure;
+          }
+        }
+
+        if (!isASCIIDigit(input[pointer])) {
+          return failure;
+        }
+
+        while (isASCIIDigit(input[pointer])) {
+          const number = parseInt(at(input, pointer));
+          if (ipv4Piece === null) {
+            ipv4Piece = number;
+          } else if (ipv4Piece === 0) {
+            return failure;
+          } else {
+            ipv4Piece = ipv4Piece * 10 + number;
+          }
+          if (ipv4Piece > 255) {
+            return failure;
+          }
+          ++pointer;
+        }
+
+        address[pieceIndex] = address[pieceIndex] * 0x100 + ipv4Piece;
+
+        ++numbersSeen;
+
+        if (numbersSeen === 2 || numbersSeen === 4) {
+          ++pieceIndex;
+        }
+      }
+
+      if (numbersSeen !== 4) {
+        return failure;
+      }
+
+      break;
+    } else if (input[pointer] === 58) {
+      ++pointer;
+      if (input[pointer] === undefined) {
+        return failure;
+      }
+    } else if (input[pointer] !== undefined) {
+      return failure;
+    }
+
+    address[pieceIndex] = value;
+    ++pieceIndex;
+  }
+
+  if (compress !== null) {
+    let swaps = pieceIndex - compress;
+    pieceIndex = 7;
+    while (pieceIndex !== 0 && swaps > 0) {
+      const temp = address[compress + swaps - 1];
+      address[compress + swaps - 1] = address[pieceIndex];
+      address[pieceIndex] = temp;
+      --pieceIndex;
+      --swaps;
+    }
+  } else if (compress === null && pieceIndex !== 8) {
+    return failure;
+  }
+
+  return address;
+}
+
+function serializeIPv6(address) {
+  let output = "";
+  const seqResult = findLongestZeroSequence(address);
+  const compress = seqResult.idx;
+  let ignore0 = false;
+
+  for (let pieceIndex = 0; pieceIndex <= 7; ++pieceIndex) {
+    if (ignore0 && address[pieceIndex] === 0) {
+      continue;
+    } else if (ignore0) {
+      ignore0 = false;
+    }
+
+    if (compress === pieceIndex) {
+      const separator = pieceIndex === 0 ? "::" : ":";
+      output += separator;
+      ignore0 = true;
+      continue;
+    }
+
+    output += address[pieceIndex].toString(16);
+
+    if (pieceIndex !== 7) {
+      output += ":";
+    }
+  }
+
+  return output;
+}
+
+function parseHost(input, isSpecialArg) {
+  if (input[0] === "[") {
+    if (input[input.length - 1] !== "]") {
+      return failure;
+    }
+
+    return parseIPv6(input.substring(1, input.length - 1));
+  }
+
+  if (!isSpecialArg) {
+    return parseOpaqueHost(input);
+  }
+
+  const domain = utf8PercentDecode(input);
+  const asciiDomain = tr46.toASCII(domain, false, tr46.PROCESSING_OPTIONS.NONTRANSITIONAL, false);
+  if (asciiDomain === null) {
+    return failure;
+  }
+
+  if (containsForbiddenHostCodePoint(asciiDomain)) {
+    return failure;
+  }
+
+  const ipv4Host = parseIPv4(asciiDomain);
+  if (typeof ipv4Host === "number" || ipv4Host === failure) {
+    return ipv4Host;
+  }
+
+  return asciiDomain;
+}
+
+function parseOpaqueHost(input) {
+  if (containsForbiddenHostCodePointExcludingPercent(input)) {
+    return failure;
+  }
+
+  let output = "";
+  const decoded = punycode.ucs2.decode(input);
+  for (let i = 0; i < decoded.length; ++i) {
+    output += percentEncodeChar(decoded[i], isC0ControlPercentEncode);
+  }
+  return output;
+}
+
+function findLongestZeroSequence(arr) {
+  let maxIdx = null;
+  let maxLen = 1; // only find elements > 1
+  let currStart = null;
+  let currLen = 0;
+
+  for (let i = 0; i < arr.length; ++i) {
+    if (arr[i] !== 0) {
+      if (currLen > maxLen) {
+        maxIdx = currStart;
+        maxLen = currLen;
+      }
+
+      currStart = null;
+      currLen = 0;
+    } else {
+      if (currStart === null) {
+        currStart = i;
+      }
+      ++currLen;
+    }
+  }
+
+  // if trailing zeros
+  if (currLen > maxLen) {
+    maxIdx = currStart;
+    maxLen = currLen;
+  }
+
+  return {
+    idx: maxIdx,
+    len: maxLen
+  };
+}
+
+function serializeHost(host) {
+  if (typeof host === "number") {
+    return serializeIPv4(host);
+  }
+
+  // IPv6 serializer
+  if (host instanceof Array) {
+    return "[" + serializeIPv6(host) + "]";
+  }
+
+  return host;
+}
+
+function trimControlChars(url) {
+  return url.replace(/^[\u0000-\u001F\u0020]+|[\u0000-\u001F\u0020]+$/g, "");
+}
+
+function trimTabAndNewline(url) {
+  return url.replace(/\u0009|\u000A|\u000D/g, "");
+}
+
+function shortenPath(url) {
+  const path = url.path;
+  if (path.length === 0) {
+    return;
+  }
+  if (url.scheme === "file" && path.length === 1 && isNormalizedWindowsDriveLetter(path[0])) {
+    return;
+  }
+
+  path.pop();
+}
+
+function includesCredentials(url) {
+  return url.username !== "" || url.password !== "";
+}
+
+function cannotHaveAUsernamePasswordPort(url) {
+  return url.host === null || url.host === "" || url.cannotBeABaseURL || url.scheme === "file";
+}
+
+function isNormalizedWindowsDriveLetter(string) {
+  return /^[A-Za-z]:$/.test(string);
+}
+
+function URLStateMachine(input, base, encodingOverride, url, stateOverride) {
+  this.pointer = 0;
+  this.input = input;
+  this.base = base || null;
+  this.encodingOverride = encodingOverride || "utf-8";
+  this.stateOverride = stateOverride;
+  this.url = url;
+  this.failure = false;
+  this.parseError = false;
+
+  if (!this.url) {
+    this.url = {
+      scheme: "",
+      username: "",
+      password: "",
+      host: null,
+      port: null,
+      path: [],
+      query: null,
+      fragment: null,
+
+      cannotBeABaseURL: false
+    };
+
+    const res = trimControlChars(this.input);
+    if (res !== this.input) {
+      this.parseError = true;
+    }
+    this.input = res;
+  }
+
+  const res = trimTabAndNewline(this.input);
+  if (res !== this.input) {
+    this.parseError = true;
+  }
+  this.input = res;
+
+  this.state = stateOverride || "scheme start";
+
+  this.buffer = "";
+  this.atFlag = false;
+  this.arrFlag = false;
+  this.passwordTokenSeenFlag = false;
+
+  this.input = punycode.ucs2.decode(this.input);
+
+  for (; this.pointer <= this.input.length; ++this.pointer) {
+    const c = this.input[this.pointer];
+    const cStr = isNaN(c) ? undefined : String.fromCodePoint(c);
+
+    // exec state machine
+    const ret = this["parse " + this.state](c, cStr);
+    if (!ret) {
+      break; // terminate algorithm
+    } else if (ret === failure) {
+      this.failure = true;
+      break;
+    }
+  }
+}
+
+URLStateMachine.prototype["parse scheme start"] = function parseSchemeStart(c, cStr) {
+  if (isASCIIAlpha(c)) {
+    this.buffer += cStr.toLowerCase();
+    this.state = "scheme";
+  } else if (!this.stateOverride) {
+    this.state = "no scheme";
+    --this.pointer;
+  } else {
+    this.parseError = true;
+    return failure;
+  }
+
+  return true;
+};
+
+URLStateMachine.prototype["parse scheme"] = function parseScheme(c, cStr) {
+  if (isASCIIAlphanumeric(c) || c === 43 || c === 45 || c === 46) {
+    this.buffer += cStr.toLowerCase();
+  } else if (c === 58) {
+    if (this.stateOverride) {
+      if (isSpecial(this.url) && !isSpecialScheme(this.buffer)) {
+        return false;
+      }
+
+      if (!isSpecial(this.url) && isSpecialScheme(this.buffer)) {
+        return false;
+      }
+
+      if ((includesCredentials(this.url) || this.url.port !== null) && this.buffer === "file") {
+        return false;
+      }
+
+      if (this.url.scheme === "file" && (this.url.host === "" || this.url.host === null)) {
+        return false;
+      }
+    }
+    this.url.scheme = this.buffer;
+    this.buffer = "";
+    if (this.stateOverride) {
+      return false;
+    }
+    if (this.url.scheme === "file") {
+      if (this.input[this.pointer + 1] !== 47 || this.input[this.pointer + 2] !== 47) {
+        this.parseError = true;
+      }
+      this.state = "file";
+    } else if (isSpecial(this.url) && this.base !== null && this.base.scheme === this.url.scheme) {
+      this.state = "special relative or authority";
+    } else if (isSpecial(this.url)) {
+      this.state = "special authority slashes";
+    } else if (this.input[this.pointer + 1] === 47) {
+      this.state = "path or authority";
+      ++this.pointer;
+    } else {
+      this.url.cannotBeABaseURL = true;
+      this.url.path.push("");
+      this.state = "cannot-be-a-base-URL path";
+    }
+  } else if (!this.stateOverride) {
+    this.buffer = "";
+    this.state = "no scheme";
+    this.pointer = -1;
+  } else {
+    this.parseError = true;
+    return failure;
+  }
+
+  return true;
+};
+
+URLStateMachine.prototype["parse no scheme"] = function parseNoScheme(c) {
+  if (this.base === null || (this.base.cannotBeABaseURL && c !== 35)) {
+    return failure;
+  } else if (this.base.cannotBeABaseURL && c === 35) {
+    this.url.scheme = this.base.scheme;
+    this.url.path = this.base.path.slice();
+    this.url.query = this.base.query;
+    this.url.fragment = "";
+    this.url.cannotBeABaseURL = true;
+    this.state = "fragment";
+  } else if (this.base.scheme === "file") {
+    this.state = "file";
+    --this.pointer;
+  } else {
+    this.state = "relative";
+    --this.pointer;
+  }
+
+  return true;
+};
+
+URLStateMachine.prototype["parse special relative or authority"] = function parseSpecialRelativeOrAuthority(c) {
+  if (c === 47 && this.input[this.pointer + 1] === 47) {
+    this.state = "special authority ignore slashes";
+    ++this.pointer;
+  } else {
+    this.parseError = true;
+    this.state = "relative";
+    --this.pointer;
+  }
+
+  return true;
+};
+
+URLStateMachine.prototype["parse path or authority"] = function parsePathOrAuthority(c) {
+  if (c === 47) {
+    this.state = "authority";
+  } else {
+    this.state = "path";
+    --this.pointer;
+  }
+
+  return true;
+};
+
+URLStateMachine.prototype["parse relative"] = function parseRelative(c) {
+  this.url.scheme = this.base.scheme;
+  if (isNaN(c)) {
+    this.url.username = this.base.username;
+    this.url.password = this.base.password;
+    this.url.host = this.base.host;
+    this.url.port = this.base.port;
+    this.url.path = this.base.path.slice();
+    this.url.query = this.base.query;
+  } else if (c === 47) {
+    this.state = "relative slash";
+  } else if (c === 63) {
+    this.url.username = this.base.username;
+    this.url.password = this.base.password;
+    this.url.host = this.base.host;
+    this.url.port = this.base.port;
+    this.url.path = this.base.path.slice();
+    this.url.query = "";
+    this.state = "query";
+  } else if (c === 35) {
+    this.url.username = this.base.username;
+    this.url.password = this.base.password;
+    this.url.host = this.base.host;
+    this.url.port = this.base.port;
+    this.url.path = this.base.path.slice();
+    this.url.query = this.base.query;
+    this.url.fragment = "";
+    this.state = "fragment";
+  } else if (isSpecial(this.url) && c === 92) {
+    this.parseError = true;
+    this.state = "relative slash";
+  } else {
+    this.url.username = this.base.username;
+    this.url.password = this.base.password;
+    this.url.host = this.base.host;
+    this.url.port = this.base.port;
+    this.url.path = this.base.path.slice(0, this.base.path.length - 1);
+
+    this.state = "path";
+    --this.pointer;
+  }
+
+  return true;
+};
+
+URLStateMachine.prototype["parse relative slash"] = function parseRelativeSlash(c) {
+  if (isSpecial(this.url) && (c === 47 || c === 92)) {
+    if (c === 92) {
+      this.parseError = true;
+    }
+    this.state = "special authority ignore slashes";
+  } else if (c === 47) {
+    this.state = "authority";
+  } else {
+    this.url.username = this.base.username;
+    this.url.password = this.base.password;
+    this.url.host = this.base.host;
+    this.url.port = this.base.port;
+    this.state = "path";
+    --this.pointer;
+  }
+
+  return true;
+};
+
+URLStateMachine.prototype["parse special authority slashes"] = function parseSpecialAuthoritySlashes(c) {
+  if (c === 47 && this.input[this.pointer + 1] === 47) {
+    this.state = "special authority ignore slashes";
+    ++this.pointer;
+  } else {
+    this.parseError = true;
+    this.state = "special authority ignore slashes";
+    --this.pointer;
+  }
+
+  return true;
+};
+
+URLStateMachine.prototype["parse special authority ignore slashes"] = function parseSpecialAuthorityIgnoreSlashes(c) {
+  if (c !== 47 && c !== 92) {
+    this.state = "authority";
+    --this.pointer;
+  } else {
+    this.parseError = true;
+  }
+
+  return true;
+};
+
+URLStateMachine.prototype["parse authority"] = function parseAuthority(c, cStr) {
+  if (c === 64) {
+    this.parseError = true;
+    if (this.atFlag) {
+      this.buffer = "%40" + this.buffer;
+    }
+    this.atFlag = true;
+
+    // careful, this is based on buffer and has its own pointer (this.pointer != pointer) and inner chars
+    const len = countSymbols(this.buffer);
+    for (let pointer = 0; pointer < len; ++pointer) {
+      const codePoint = this.buffer.codePointAt(pointer);
+
+      if (codePoint === 58 && !this.passwordTokenSeenFlag) {
+        this.passwordTokenSeenFlag = true;
+        continue;
+      }
+      const encodedCodePoints = percentEncodeChar(codePoint, isUserinfoPercentEncode);
+      if (this.passwordTokenSeenFlag) {
+        this.url.password += encodedCodePoints;
+      } else {
+        this.url.username += encodedCodePoints;
+      }
+    }
+    this.buffer = "";
+  } else if (isNaN(c) || c === 47 || c === 63 || c === 35 ||
+             (isSpecial(this.url) && c === 92)) {
+    if (this.atFlag && this.buffer === "") {
+      this.parseError = true;
+      return failure;
+    }
+    this.pointer -= countSymbols(this.buffer) + 1;
+    this.buffer = "";
+    this.state = "host";
+  } else {
+    this.buffer += cStr;
+  }
+
+  return true;
+};
+
+URLStateMachine.prototype["parse hostname"] =
+URLStateMachine.prototype["parse host"] = function parseHostName(c, cStr) {
+  if (this.stateOverride && this.url.scheme === "file") {
+    --this.pointer;
+    this.state = "file host";
+  } else if (c === 58 && !this.arrFlag) {
+    if (this.buffer === "") {
+      this.parseError = true;
+      return failure;
+    }
+
+    const host = parseHost(this.buffer, isSpecial(this.url));
+    if (host === failure) {
+      return failure;
+    }
+
+    this.url.host = host;
+    this.buffer = "";
+    this.state = "port";
+    if (this.stateOverride === "hostname") {
+      return false;
+    }
+  } else if (isNaN(c) || c === 47 || c === 63 || c === 35 ||
+             (isSpecial(this.url) && c === 92)) {
+    --this.pointer;
+    if (isSpecial(this.url) && this.buffer === "") {
+      this.parseError = true;
+      return failure;
+    } else if (this.stateOverride && this.buffer === "" &&
+               (includesCredentials(this.url) || this.url.port !== null)) {
+      this.parseError = true;
+      return false;
+    }
+
+    const host = parseHost(this.buffer, isSpecial(this.url));
+    if (host === failure) {
+      return failure;
+    }
+
+    this.url.host = host;
+    this.buffer = "";
+    this.state = "path start";
+    if (this.stateOverride) {
+      return false;
+    }
+  } else {
+    if (c === 91) {
+      this.arrFlag = true;
+    } else if (c === 93) {
+      this.arrFlag = false;
+    }
+    this.buffer += cStr;
+  }
+
+  return true;
+};
+
+URLStateMachine.prototype["parse port"] = function parsePort(c, cStr) {
+  if (isASCIIDigit(c)) {
+    this.buffer += cStr;
+  } else if (isNaN(c) || c === 47 || c === 63 || c === 35 ||
+             (isSpecial(this.url) && c === 92) ||
+             this.stateOverride) {
+    if (this.buffer !== "") {
+      const port = parseInt(this.buffer);
+      if (port > Math.pow(2, 16) - 1) {
+        this.parseError = true;
+        return failure;
+      }
+      this.url.port = port === defaultPort(this.url.scheme) ? null : port;
+      this.buffer = "";
+    }
+    if (this.stateOverride) {
+      return false;
+    }
+    this.state = "path start";
+    --this.pointer;
+  } else {
+    this.parseError = true;
+    return failure;
+  }
+
+  return true;
+};
+
+const fileOtherwiseCodePoints = new Set([47, 92, 63, 35]);
+
+URLStateMachine.prototype["parse file"] = function parseFile(c) {
+  this.url.scheme = "file";
+
+  if (c === 47 || c === 92) {
+    if (c === 92) {
+      this.parseError = true;
+    }
+    this.state = "file slash";
+  } else if (this.base !== null && this.base.scheme === "file") {
+    if (isNaN(c)) {
+      this.url.host = this.base.host;
+      this.url.path = this.base.path.slice();
+      this.url.query = this.base.query;
+    } else if (c === 63) {
+      this.url.host = this.base.host;
+      this.url.path = this.base.path.slice();
+      this.url.query = "";
+      this.state = "query";
+    } else if (c === 35) {
+      this.url.host = this.base.host;
+      this.url.path = this.base.path.slice();
+      this.url.query = this.base.query;
+      this.url.fragment = "";
+      this.state = "fragment";
+    } else {
+      if (this.input.length - this.pointer - 1 === 0 || // remaining consists of 0 code points
+          !isWindowsDriveLetterCodePoints(c, this.input[this.pointer + 1]) ||
+          (this.input.length - this.pointer - 1 >= 2 && // remaining has at least 2 code points
+           !fileOtherwiseCodePoints.has(this.input[this.pointer + 2]))) {
+        this.url.host = this.base.host;
+        this.url.path = this.base.path.slice();
+        shortenPath(this.url);
+      } else {
+        this.parseError = true;
+      }
+
+      this.state = "path";
+      --this.pointer;
+    }
+  } else {
+    this.state = "path";
+    --this.pointer;
+  }
+
+  return true;
+};
+
+URLStateMachine.prototype["parse file slash"] = function parseFileSlash(c) {
+  if (c === 47 || c === 92) {
+    if (c === 92) {
+      this.parseError = true;
+    }
+    this.state = "file host";
+  } else {
+    if (this.base !== null && this.base.scheme === "file") {
+      if (isNormalizedWindowsDriveLetterString(this.base.path[0])) {
+        this.url.path.push(this.base.path[0]);
+      } else {
+        this.url.host = this.base.host;
+      }
+    }
+    this.state = "path";
+    --this.pointer;
+  }
+
+  return true;
+};
+
+URLStateMachine.prototype["parse file host"] = function parseFileHost(c, cStr) {
+  if (isNaN(c) || c === 47 || c === 92 || c === 63 || c === 35) {
+    --this.pointer;
+    if (!this.stateOverride && isWindowsDriveLetterString(this.buffer)) {
+      this.parseError = true;
+      this.state = "path";
+    } else if (this.buffer === "") {
+      this.url.host = "";
+      if (this.stateOverride) {
+        return false;
+      }
+      this.state = "path start";
+    } else {
+      let host = parseHost(this.buffer, isSpecial(this.url));
+      if (host === failure) {
+        return failure;
+      }
+      if (host === "localhost") {
+        host = "";
+      }
+      this.url.host = host;
+
+      if (this.stateOverride) {
+        return false;
+      }
+
+      this.buffer = "";
+      this.state = "path start";
+    }
+  } else {
+    this.buffer += cStr;
+  }
+
+  return true;
+};
+
+URLStateMachine.prototype["parse path start"] = function parsePathStart(c) {
+  if (isSpecial(this.url)) {
+    if (c === 92) {
+      this.parseError = true;
+    }
+    this.state = "path";
+
+    if (c !== 47 && c !== 92) {
+      --this.pointer;
+    }
+  } else if (!this.stateOverride && c === 63) {
+    this.url.query = "";
+    this.state = "query";
+  } else if (!this.stateOverride && c === 35) {
+    this.url.fragment = "";
+    this.state = "fragment";
+  } else if (c !== undefined) {
+    this.state = "path";
+    if (c !== 47) {
+      --this.pointer;
+    }
+  }
+
+  return true;
+};
+
+URLStateMachine.prototype["parse path"] = function parsePath(c) {
+  if (isNaN(c) || c === 47 || (isSpecial(this.url) && c === 92) ||
+      (!this.stateOverride && (c === 63 || c === 35))) {
+    if (isSpecial(this.url) && c === 92) {
+      this.parseError = true;
+    }
+
+    if (isDoubleDot(this.buffer)) {
+      shortenPath(this.url);
+      if (c !== 47 && !(isSpecial(this.url) && c === 92)) {
+        this.url.path.push("");
+      }
+    } else if (isSingleDot(this.buffer) && c !== 47 &&
+               !(isSpecial(this.url) && c === 92)) {
+      this.url.path.push("");
+    } else if (!isSingleDot(this.buffer)) {
+      if (this.url.scheme === "file" && this.url.path.length === 0 && isWindowsDriveLetterString(this.buffer)) {
+        if (this.url.host !== "" && this.url.host !== null) {
+          this.parseError = true;
+          this.url.host = "";
+        }
+        this.buffer = this.buffer[0] + ":";
+      }
+      this.url.path.push(this.buffer);
+    }
+    this.buffer = "";
+    if (this.url.scheme === "file" && (c === undefined || c === 63 || c === 35)) {
+      while (this.url.path.length > 1 && this.url.path[0] === "") {
+        this.parseError = true;
+        this.url.path.shift();
+      }
+    }
+    if (c === 63) {
+      this.url.query = "";
+      this.state = "query";
+    }
+    if (c === 35) {
+      this.url.fragment = "";
+      this.state = "fragment";
+    }
+  } else {
+    // TODO: If c is not a URL code point and not "%", parse error.
+
+    if (c === 37 &&
+      (!isASCIIHex(this.input[this.pointer + 1]) ||
+        !isASCIIHex(this.input[this.pointer + 2]))) {
+      this.parseError = true;
+    }
+
+    this.buffer += percentEncodeChar(c, isPathPercentEncode);
+  }
+
+  return true;
+};
+
+URLStateMachine.prototype["parse cannot-be-a-base-URL path"] = function parseCannotBeABaseURLPath(c) {
+  if (c === 63) {
+    this.url.query = "";
+    this.state = "query";
+  } else if (c === 35) {
+    this.url.fragment = "";
+    this.state = "fragment";
+  } else {
+    // TODO: Add: not a URL code point
+    if (!isNaN(c) && c !== 37) {
+      this.parseError = true;
+    }
+
+    if (c === 37 &&
+        (!isASCIIHex(this.input[this.pointer + 1]) ||
+         !isASCIIHex(this.input[this.pointer + 2]))) {
+      this.parseError = true;
+    }
+
+    if (!isNaN(c)) {
+      this.url.path[0] = this.url.path[0] + percentEncodeChar(c, isC0ControlPercentEncode);
+    }
+  }
+
+  return true;
+};
+
+URLStateMachine.prototype["parse query"] = function parseQuery(c, cStr) {
+  if (isNaN(c) || (!this.stateOverride && c === 35)) {
+    if (!isSpecial(this.url) || this.url.scheme === "ws" || this.url.scheme === "wss") {
+      this.encodingOverride = "utf-8";
+    }
+
+    const buffer = new Buffer(this.buffer); // TODO: Use encoding override instead
+    for (let i = 0; i < buffer.length; ++i) {
+      if (buffer[i] < 0x21 || buffer[i] > 0x7E || buffer[i] === 0x22 || buffer[i] === 0x23 ||
+          buffer[i] === 0x3C || buffer[i] === 0x3E) {
+        this.url.query += percentEncode(buffer[i]);
+      } else {
+        this.url.query += String.fromCodePoint(buffer[i]);
+      }
+    }
+
+    this.buffer = "";
+    if (c === 35) {
+      this.url.fragment = "";
+      this.state = "fragment";
+    }
+  } else {
+    // TODO: If c is not a URL code point and not "%", parse error.
+    if (c === 37 &&
+      (!isASCIIHex(this.input[this.pointer + 1]) ||
+        !isASCIIHex(this.input[this.pointer + 2]))) {
+      this.parseError = true;
+    }
+
+    this.buffer += cStr;
+  }
+
+  return true;
+};
+
+URLStateMachine.prototype["parse fragment"] = function parseFragment(c) {
+  if (isNaN(c)) { // do nothing
+  } else if (c === 0x0) {
+    this.parseError = true;
+  } else {
+    // TODO: If c is not a URL code point and not "%", parse error.
+    if (c === 37 &&
+      (!isASCIIHex(this.input[this.pointer + 1]) ||
+        !isASCIIHex(this.input[this.pointer + 2]))) {
+      this.parseError = true;
+    }
+
+    this.url.fragment += percentEncodeChar(c, isC0ControlPercentEncode);
+  }
+
+  return true;
+};
+
+function serializeURL(url, excludeFragment) {
+  let output = url.scheme + ":";
+  if (url.host !== null) {
+    output += "//";
+
+    if (url.username !== "" || url.password !== "") {
+      output += url.username;
+      if (url.password !== "") {
+        output += ":" + url.password;
+      }
+      output += "@";
+    }
+
+    output += serializeHost(url.host);
+
+    if (url.port !== null) {
+      output += ":" + url.port;
+    }
+  } else if (url.host === null && url.scheme === "file") {
+    output += "//";
+  }
+
+  if (url.cannotBeABaseURL) {
+    output += url.path[0];
+  } else {
+    for (const string of url.path) {
+      output += "/" + string;
+    }
+  }
+
+  if (url.query !== null) {
+    output += "?" + url.query;
+  }
+
+  if (!excludeFragment && url.fragment !== null) {
+    output += "#" + url.fragment;
+  }
+
+  return output;
+}
+
+function serializeOrigin(tuple) {
+  let result = tuple.scheme + "://";
+  result += serializeHost(tuple.host);
+
+  if (tuple.port !== null) {
+    result += ":" + tuple.port;
+  }
+
+  return result;
+}
+
+module.exports.serializeURL = serializeURL;
+
+module.exports.serializeURLOrigin = function (url) {
+  // https://url.spec.whatwg.org/#concept-url-origin
+  switch (url.scheme) {
+    case "blob":
+      try {
+        return module.exports.serializeURLOrigin(module.exports.parseURL(url.path[0]));
+      } catch (e) {
+        // serializing an opaque origin returns "null"
+        return "null";
+      }
+    case "ftp":
+    case "gopher":
+    case "http":
+    case "https":
+    case "ws":
+    case "wss":
+      return serializeOrigin({
+        scheme: url.scheme,
+        host: url.host,
+        port: url.port
+      });
+    case "file":
+      // spec says "exercise to the reader", chrome says "file://"
+      return "file://";
+    default:
+      // serializing an opaque origin returns "null"
+      return "null";
+  }
+};
+
+module.exports.basicURLParse = function (input, options) {
+  if (options === undefined) {
+    options = {};
+  }
+
+  const usm = new URLStateMachine(input, options.baseURL, options.encodingOverride, options.url, options.stateOverride);
+  if (usm.failure) {
+    return "failure";
+  }
+
+  return usm.url;
+};
+
+module.exports.setTheUsername = function (url, username) {
+  url.username = "";
+  const decoded = punycode.ucs2.decode(username);
+  for (let i = 0; i < decoded.length; ++i) {
+    url.username += percentEncodeChar(decoded[i], isUserinfoPercentEncode);
+  }
+};
+
+module.exports.setThePassword = function (url, password) {
+  url.password = "";
+  const decoded = punycode.ucs2.decode(password);
+  for (let i = 0; i < decoded.length; ++i) {
+    url.password += percentEncodeChar(decoded[i], isUserinfoPercentEncode);
+  }
+};
+
+module.exports.serializeHost = serializeHost;
+
+module.exports.cannotHaveAUsernamePasswordPort = cannotHaveAUsernamePasswordPort;
+
+module.exports.serializeInteger = function (integer) {
+  return String(integer);
+};
+
+module.exports.parseURL = function (input, options) {
+  if (options === undefined) {
+    options = {};
+  }
+
+  // We don't handle blobs, so this just delegates:
+  return module.exports.basicURLParse(input, { baseURL: options.baseURL, encodingOverride: options.encodingOverride });
+};
 
 
 /***/ }),
@@ -11048,6 +11048,10 @@ async function build() {
     if ((0, helpers_1.isDefaultBranch)() && core.getBooleanInput('tag-latest-on-default')) {
         extraTags.push('latest');
     }
+    const customTag = core.getInput('custom-tag');
+    if (customTag != '' ) {
+      extraTags.push(customTag);
+    }
     // Build test env if the stage is specified
     const testStage = core.getInput('testenv-stage').trim();
     if (testStage === '') {
diff --git a/src/index.ts b/src/index.ts
index af5f828..9fc99b1 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -72,6 +72,11 @@ async function build(): Promise<void> {
   if (isDefaultBranch() && core.getBooleanInput('tag-latest-on-default')) {
     extraTags.push('latest')
   }
+  
+  const customTag = core.getInput('custom-tag')
+  if (customTag !== '') {
+    extraTags.push(customTag)
+  }
 
   // Build test env if the stage is specified
   const testStage = core.getInput('testenv-stage').trim()