[FIX] Package building error.

Author: MakarovS96

.gitignore

@@ -1,4 +1,5 @@
 csp/.idea
 .idea
 node_modules
-build
+build
+package-lock.json

gulpfile.js

@@ -26,13 +26,23 @@ gulp.task('lint', function () {
 });
 
 gulp.task('minify:js', function () {
+    var assets = useref.assets();
     return gulp.src('./csp/index.html')
-        .pipe(useref())
+        .pipe(assets)
         .pipe(gulpIf("*.js",replace('"{{package.json.version}}"', '"' + p.version + '"')))
         .pipe(gulpIf("*.js",traceur()))
         .pipe(gulpIf("*.js",uglify()))
         .pipe(gulpIf("*.html",htmlmin({empty: false})))
-        .pipe(gulp.dest('build'));
+        .pipe(assets.restore())
+        .pipe(useref())
+        //.pipe(gulp.dest('build'))
+        .pipe(through.obj(function (chunk, enc, cb) {
+            if (!fs.existsSync("./build")) fs.mkdirSync("./build");
+            if (!fs.existsSync("./build/src")) fs.mkdirSync("./build/src");
+            fs.writeFileSync("./build/"+chunk.relative, chunk.contents);
+            cb(null, chunk);
+        }))
+        .pipe(debug({title: "after save"}));
 });
 
 gulp.task('minify:css', function () {

package.json

@@ -17,7 +17,7 @@
     "gulp-replace": "^0.6.1",
     "gulp-traceur-compiler": "^1.1.4",
     "gulp-uglify": "^3.0.0",
-    "gulp-useref": "^3.1.2",
+    "gulp-useref": "^1.3.0",
     "jshint": "^2.9.5",
     "through2": "^2.0.3"
   },