error with node v0.10.29 about array-uniq

[xmlking]

same issue with all gulp plugins that depends on this module. del , gulp-filter etc.
this looks like happening when traceur is used in node env to write gulp tasks in ES6.
e.g: karma-traceur-preprocessor etc.

my gulpfile.js contains following ES6 setup

'use strict';
require('traceur').require.makeDefault(function(filename) {
    // don't transpile our dependencies, just our app
    return filename.indexOf('node_modules') === -1;
}, { experimental:true});

require('./tasks/index');

sothat I can write gulp tasks like this..

import {ErrorHandler} from './errors';
let jshint      = require('gulp-jshint'),
    gif         = require('gulp-if'),
    preprocess  = require('gulp-preprocess'),
    traceur     = require('gulp-traceur'),
    sourcemaps  = require('gulp-sourcemaps'),

    gulp.task('transpile', () => {
        return gulp.src('app/scripts/**/*.js')
            .pipe(gif(/app\/scripts\/index.js/, preprocess({context: {env}})))
            .pipe(gif(env === 'DEV', sourcemaps.init()))
                .pipe(traceur(traceurOptions))
                .on('error', ErrorHandler.onError)
            .pipe(gif(env === 'DEV', sourcemaps.write('.', {includeContent: false, sourceRoot: '/app/scripts'})))
            .pipe(gulp.dest('.tmp/scripts'));
    });

error:

[17:01:27] Starting 'clean'...
undefined:1824
      for (var $__25 = iterable[Symbol.iterator](),
                                                ^
TypeError: undefined is not a function
  at new Set (<anonymous>:1824:49)
  at uniqSetWithForEach (/Developer/Work/spa-starter-kit/node_modules/del/node_modules/globby/node_modules/array-union/node_modules/array-uniq/index.js:33:3)
  at module.exports (/Developer/Work/spa-starter-kit/node_modules/del/node_modules/globby/node_modules/array-union/index.js:5:9)
  at /Developer/Work/spa-starter-kit/node_modules/del/node_modules/globby/index.js:38:15
  at f (/Developer/Work/spa-starter-kit/node_modules/del/node_modules/globby/node_modules/glob/node_modules/once/once.js:16:25)
  at Glob.<anonymous> (/Developer/Work/spa-starter-kit/node_modules/del/node_modules/globby/node_modules/glob/glob.js:100:7)
  at Glob.EventEmitter.emit (events.js:107:17)
  at Glob.next (/Developer/Work/spa-starter-kit/node_modules/del/node_modules/globby/node_modules/glob/glob.js:357:10)
  at Glob._processEmitQueue (/Developer/Work/spa-starter-kit/node_modules/del/node_modules/globby/node_modules/glob/glob.js:322:12)
  at Glob.emitMatch (/Developer/Work/spa-starter-kit/node_modules/del/node_modules/globby/node_modules/glob/glob.js:302:8)
  at Glob._finish (/Developer/Work/spa-starter-kit/node_modules/del/node_modules/globby/node_modules/glob/glob.js:242:8)
  at Glob.<anonymous> (/Developer/Work/spa-starter-kit/node_modules/del/node_modules/globby/node_modules/glob/glob.js:195:27)
  at Glob.cb (/Developer/Work/spa-starter-kit/node_modules/del/node_modules/globby/node_modules/glob/glob.js:380:11)
  at Glob.<anonymous> (/Developer/Work/spa-starter-kit/node_modules/del/node_modules/globby/node_modules/glob/glob.js:420:16)
  at Glob._afterStat (/Developer/Work/spa-starter-kit/node_modules/del/node_modules/globby/node_modules/glob/glob.js:634:6)
  at Object.oncomplete (evalmachine.<anonymous>:97:15)

[sindresorhus]

Not really relevant to this module. I'm doing feature testing

array-uniq/index.js

Lines 41 to 42 in a49548d

	if ('Set' in global) {
	if (typeof Set.prototype.forEach === 'function') {

I can't really control other modules mocking with built-ins.

[xmlking]

thanks @sindresorhus
looks like traceur polyfill for Set is causing this error. It expect Symbol.iterator defined.
will let you know if I found a workarround

line 1824 in traceur.js for (var $__25 = iterable[Symbol.iterator](),

test case:

    gulp.task('clean', (cb) => {
        //del(['.tmp', 'dist'], cb);

        var a = new Set();
        console.log('Set' in global);
        console.log(typeof Set.prototype.forEach === 'function');
        console.log(a);
        console.log(Set.prototype.forEach);
        console.log(new Set([1,1])); // this throw the error in traceur.js code // arr[Symbol.iterator]() undefined...
    });

true
true
{ map_: 
   { entries_: [],
     objectIndex_: {},
     stringIndex_: {},
     primitiveIndex_: {},
     deletedCount_: 0 } }
[Function]
[09:05:11] 'clean' errored after 2.68 ms
[09:05:11] TypeError: undefined is not a function
    at new Set (eval at <anonymous> (/Developer/Work/spa-starter-kit/node_modules/traceur/src/node/traceur.js:1:0), <anonymous>:1824:49)
    at Gulp.<anonymous> (/Developer/Work/spa-starter-kit/tasks/build.js:42:17)
    at module.exports (/Developer/Work/spa-starter-kit/node_modules/gulp/node_modules/orchestrator/lib/runTask.js:34:7)
    at Gulp.Orchestrator._runTask (/Developer/Work/spa-starter-kit/node_modules/gulp/node_modules/orchestrator/index.js:273:3)
    at Gulp.Orchestrator._runStep (/Developer/Work/spa-starter-kit/node_modules/gulp/node_modules/orchestrator/index.js:214:10)
    at Gulp.Orchestrator.start (/Developer/Work/spa-starter-kit/node_modules/gulp/node_modules/orchestrator/index.js:134:8)
    at /usr/local/lib/node_modules/gulp/bin/gulp.js:121:20
    at process._tickDomainCallback (node.js:372:11)
    at Function.Module.runMain (module.js:492:11)
    at startup (node.js:124:16)

[sindresorhus]

You should report it on the Traceur issue tracker ;)

[xmlking]

looks like there is an open issue on it.
google/traceur-compiler#563

just reported an issue for Traceur
google/traceur-compiler#1228