Minify JavaScript with UglifyJS2.

Install package with NPM and add it to your development dependencies:

npm install --save-dev gulp-uglify

var uglify = require('gulp-uglify');

gulp.task('compress', function() {
  gulp.src('lib/*.js')
    .pipe(uglify())
    .pipe(gulp.dest('dist'))
});

• mangle

  Pass false to skip mangling names.

• output

  Pass an object if you wish to specify additional output options. The defaults are optimized for best compression.

• compress

  Pass an object to specify custom compressor options. Pass false to skip compression completely.

• preserveComments

  A convenience option for options.output.comments. Defaults to preserving no comments.

  • all

    Preserve all comments in code blocks

  • some

    Preserve comments that start with a bang (!) or include a Closure Compiler directive (@preserve, @license, @cc_on)

  • function

    Specify your own comment preservation function. You will be passed the current node and the current comment and are expected to return either true or false.

You can also pass the uglify function any of the options listed here to modify UglifyJS's behavior.