Minify JavaScript with terser.

The latest version of gulp-minify is using terser to minify files, this may cause some incompatible issues with earlier language versions for now, see #27.

So gulp-minify@es5 is for the earlier language versions if your project is not ready for the ECMAScript 6 yet.

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

npm install --save-dev gulp-minify

Basic usage: the following minifies every *.js and *.mjs files to *-min.js and *-min.mjs respectively. Note that the original files are preserved.

const minify = require('gulp-minify');

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

Options can be added to control more finely what's happening, for example:

const minify = require('gulp-minify');

gulp.task('compress', function() {
  gulp.src('lib/*.js')
    .pipe(minify({
        ext:{
            src:'-debug.js',
            min:'.js'
        },
        exclude: ['tasks'],
        ignoreFiles: ['.combo.js', '-min.js']
    }))
    .pipe(gulp.dest('dist'))
});

• ext An object that specifies output src and minified file extensions.

  • src

    The suffix string of the filenames that output source files ends with.

  • min

    • When string: The suffix string of the filenames that output minified files ends with.
    • When Array: The regex expressions to be replaced with input filenames. For example: [/\.(.*)-source\.js$/, '$1.js']

• exclude

  Will not minify files in the dirs.

• noSource Will not output the source code in the dest dirs.

• ignoreFiles

  Will not minify files which matches the pattern.

• 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.