Gulp-autoprefixer throwing ReferenceError: Promise is not defined

I try to make a gulp compile my sass then autoprefixit with gulp-autoprefixer but i'm getting an error.

var gulp = require('gulp'),
    sass = require('gulp-sass'),
    autoprefixer = require('gulp-autoprefixer');

gulp.task('test', function(){
    gulp.src('_sass/main.sass')
        .pipe(sass())
        .pipe(autoprefixer()) 
        .pipe(gulp.dest('./assets/css')); 
});

I'm trying to run this Gulpfile.js and i'm using :

"gulp": "~3.9.0",
"gulp-sass": "~2.0.4",
"gulp-autoprefixer": "~3.0.1",

and NPM version 1.3.10

When i run gulp test i get this :

/home/matei/Tests/test-4/node_modules/gulp-autoprefixer/node_modules/postcss/lib/lazy-result.js:152
        this.processing = new Promise(function (resolve, reject) {
                              ^
ReferenceError: Promise is not defined
    at LazyResult.async (/home/matei/Tests/test-4/node_modules/gulp-autoprefixer/node_modules/postcss/lib/lazy-result.js:152:31)
    at LazyResult.then (/home/matei/Tests/test-4/node_modules/gulp-autoprefixer/node_modules/postcss/lib/lazy-result.js:75:21)
    at DestroyableTransform._transform (/home/matei/Tests/test-4/node_modules/gulp-autoprefixer/index.js:28:13)
    at DestroyableTransform.Transform._read (/home/matei/Tests/test-4/node_modules/gulp-autoprefixer/node_modules/through2/node_modules/readable-stream/lib/_stream_transform.js:172:10)
    at DestroyableTransform.Transform._write (/home/matei/Tests/test-4/node_modules/gulp-autoprefixer/node_modules/through2/node_modules/readable-stream/lib/_stream_transform.js:160:12)
    at doWrite (/home/matei/Tests/test-4/node_modules/gulp-autoprefixer/node_modules/through2/node_modules/readable-stream/lib/_stream_writable.js:326:12)
    at writeOrBuffer (/home/matei/Tests/test-4/node_modules/gulp-autoprefixer/node_modules/through2/node_modules/readable-stream/lib/_stream_writable.js:312:5)
    at DestroyableTransform.Writable.write (/home/matei/Tests/test-4/node_modules/gulp-autoprefixer/node_modules/through2/node_modules/readable-stream/lib/_stream_writable.js:239:11)
    at write (/home/matei/Tests/test-4/node_modules/gulp-sass/node_modules/through2/node_modules/readable-stream/lib/_stream_readable.js:623:24)
    at flow (/home/matei/Tests/test-4/node_modules/gulp-sass/node_modules/through2/node_modules/readable-stream/lib/_stream_readable.js:632:7)

I don't really know what i'm doing wrong. Is not working when i use sass or plain css. I think is something with my files.

Had the same issue. For me, updating node didn't work but adding this at the very beginning of my gulpfile did:

require('es6-promise').polyfill();

I updated node.js to the latest version using :

# Using Ubuntu
curl -sL https://deb.nodesource.com/setup_4.x | sudo -E bash -
sudo apt-get install -y nodejs

for my Ubuntu machine, as shown here.

After that i updated NPM using :

sudo npm cache clean -f
sudo npm install -g n
sudo n stable

As shown here.

Now the gulp-autoprefixer start working but i got an error from gulp-sass. I updated it using this instruction :

1. Delete your node_modules folder
2. Remove gulp-sass from your package.json file
3. Remove node-sass from your package.json file (if you have it in there)
4. Run npm install gulp-sass --save-dev
5. Update your Gulp task as required

Found here.Now i have "gulp-sass": "^2.0.4" and this fixed all my problems.

Thanks for advice and help.

Install es6-promise in ur project location where package.json exists

npm install es6-promise

Then make the first line of your gulpfile.js be the following code:

var Promise = require('es6-promise').Promise;

This does not answer the question directly but it might be useful for people that get this error when trying to run the ionic 2 tutorial.

As pointed by other answers the problem is that es6-promise is missing.

I got the same error when trying to start the ionic 2 tutorial (https://github.com/driftyco/ionic2-starter-tutorial): (my ionic 2 version is 2.0.0-beta.25 and latest tutorial commit is ed9ef2fcce887e4d1c08c375c849b06b8394bad7)

This is the stack trace I got when trying to run the app with ionic serve:

Running 'serve:before' gulp task before serve
[18:37:00] Starting 'clean'...
[18:37:01] Finished 'clean' after 1.02 s
[18:37:01] Starting 'watch'...
[18:37:01] Starting 'sass'...
[18:37:01] Starting 'html'...
[18:37:01] Starting 'fonts'...
[18:37:01] Starting 'scripts'...
[18:37:01] Finished 'scripts' after 62 ms
[18:37:01] Finished 'html' after 72 ms
[18:37:01] Finished 'fonts' after 77 ms
Caught exception:
 ReferenceError: Promise is not defined
    at LazyResult.async (/home/stitakis/dev/playground/ionic2/myTutorial/node_modules/ionic-gulp-sass-build/node_modules/gulp-autoprefixer/node_modules/postcss/lib/lazy-result.js:157:31)
    at LazyResult.then (/home/stitakis/dev/playground/ionic2/myTutorial/node_modules/ionic-gulp-sass-build/node_modules/gulp-autoprefixer/node_modules/postcss/lib/lazy-result.js:79:21)
    at DestroyableTransform._transform (/home/stitakis/dev/playground/ionic2/myTutorial/node_modules/ionic-gulp-sass-build/node_modules/gulp-autoprefixer/index.js:24:6)
    at DestroyableTransform.Transform._read (/home/stitakis/dev/playground/ionic2/myTutorial/node_modules/ionic-gulp-sass-build/node_modules/gulp-autoprefixer/node_modules/through2/node_modules/readable-stream/lib/_stream_transform.js:159:10)
    at DestroyableTransform.Transform._write (/home/stitakis/dev/playground/ionic2/myTutorial/node_modules/ionic-gulp-sass-build/node_modules/gulp-autoprefixer/node_modules/through2/node_modules/readable-stream/lib/_stream_transform.js:147:83)
    at doWrite (/home/stitakis/dev/playground/ionic2/myTutorial/node_modules/ionic-gulp-sass-build/node_modules/gulp-autoprefixer/node_modules/through2/node_modules/readable-stream/lib/_stream_writable.js:313:64)
    at writeOrBuffer (/home/stitakis/dev/playground/ionic2/myTutorial/node_modules/ionic-gulp-sass-build/node_modules/gulp-autoprefixer/node_modules/through2/node_modules/readable-stream/lib/_stream_writable.js:302:5)
    at DestroyableTransform.Writable.write (/home/stitakis/dev/playground/ionic2/myTutorial/node_modules/ionic-gulp-sass-build/node_modules/gulp-autoprefixer/node_modules/through2/node_modules/readable-stream/lib/_stream_writable.js:241:11)
    at DestroyableTransform.ondata (/home/stitakis/dev/playground/ionic2/myTutorial/node_modules/ionic-gulp-sass-build/node_modules/gulp-sass/node_modules/through2/node_modules/readable-stream/lib/_stream_readable.js:531:20)
    at DestroyableTransform.EventEmitter.emit (events.js:95:17) 

Again, as pointed by other answers, this is how to solve this:

1. edit gulpfile.js and add in line 6: require('es6-promise').polyfill();

2. install the missing dependency with: npm install es6-promise --save

After this changes, the problem was fixed and I was able to start the local server.