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gulp.task('js', function () {
    return gulp.src([
        'assets/js/main.js'
    ]) 
    .pipe(autopolyfiller('result_polyfill_file.js'))
    .pipe(gulp.dest('build/js'))
})

dev/node_modules/acorn/acorn.js:335
    throw err;
    ^

SyntaxError: Unexpected token (1:7)
    at raise (dev/node_modules/acorn/acorn.js:333:15)
    at unexpected (dev/node_modules/acorn/acorn.js:1366:5)
    at semicolon (dev/node_modules/acorn/acorn.js:1353:47)
    at parseExpressionStatement (dev/node_modules/acorn/acorn.js:1803:5)
    at parseStatement (dev/node_modules/acorn/acorn.js:1589:19)
    at parseTopLevel (dev/node_modules/acorn/acorn.js:1526:18)
    at Object.exports.parse (dev/node_modules/acorn/acorn.js:48:12)
    at scan (dev/node_modules/autopolyfiller/lib/polyfill-scan/index.js:29:22)
    at Object.AutoPolyFiller._scan (dev/node_modules/autopolyfiller/index.js:46:25)
    at Object.AutoPolyFiller.add (dev/node_modules/autopolyfiller/index.js:86:30)

gulp.task('scripts', function() {
  return gulp.src('src/scripts/**/*.js')
    .pipe(jshint('.jshintrc'))
    .pipe(jshint.reporter('default'))
    .pipe(concat('main.js'))
    .pipe(gulp.dest('dist/scripts'))
    .pipe(rename({ suffix: '.min' }))
    .pipe(uglify())
    .pipe(gulp.dest('dist/scripts'))
    .pipe(autopolyfiller('polyfills.js'))
    .pipe(gulp.dest('dist/scripts'))
    .pipe(notify({
        message: 'Scripts task complete'
    }));
});