Why is gulp cssnano failing?

Question

I get this error:

 this.processing = new Promise(function (resolve, reject) {
     ReferenceError: Promise is not defined

When I try to:

gulp.task('site-css', function() {
    return gulp.src(cssconfig.src)
        .pipe(cssnano())
        .pipe(concat('sitecss.min.css'))
        .pipe(gulp.dest('Styles/')); 
});

It's specifically this line that doesn't work for me.

   .pipe(cssnano())

How to solve this, or more how to minify and concat my css files?

Denys Séguret · Accepted Answer · 2016-01-11 11:03:47Z

2

Old versions of node don't have Promise defined (it's a new feature of ES2015).

Update your node installation.

answered Jan 11, 2016 at 11:03

Denys Séguret

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