gulp-uglify [![][travis-shield-img]][travis-shield][![][appveyor-shield-img]][appveyor-shield][![][npm-dl-shield-img]][npm-shield][![][npm-v-shield-img]][npm-shield][![][coveralls-shield-img]][coveralls-shield]

> Minify JavaScript with UglifyJS3.

Installation

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

npm install --save-dev gulp-uglify

Usage

``javascript
var gulp = require('gulp');
var uglify = require('gulp-uglify');
var pipeline = require('readable-stream').pipeline;

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

To help properly handle error conditions with Node streams, this project
recommends the use of
pipeline,
from readable-stream.

Options

Most of the minify options from
the UglifyJS API are supported. There are a few exceptions:

1. The sourceMap option must not be set, as it will be automatically configured
based on your Gulp configuration. See the documentation for [Gulp sourcemaps][gulp-sm].

[gulp-sm]: https://github.com/gulp-sourcemaps/gulp-sourcemaps#usage

Errors

gulp-uglify emits an 'error' event if it is unable to minify a specific file.
The GulpUglifyError constructor is exported by this plugin for instanceof checks.
It contains the following properties:

- fileName: The full file path for the file being minified.
- cause: The original UglifyJS error, if available.

Most UglifyJS error messages have the following properties:

- message (or msg)
- filename
- line

To see useful error messages, see Why Use Pipeline?.

Using a Different UglifyJS

By default, gulp-uglify uses the version of UglifyJS installed as a dependency.
It's possible to configure the use of a different version using the "composer" entry point.

`javascript
var uglifyjs = require('uglify-js'); // can be a git checkout
// or another module (such as uglify-es for ES6 support)
var composer = require('gulp-uglify/composer');
var pump = require('pump');

var minify = composer(uglifyjs, console);

gulp.task('compress', function (cb) {
// the same options as described above
var options = {};

pump([
gulp.src('lib/*.js'),
minify(options),
gulp.dest('dist')
],
cb
);
});
``

[travis-shield-img]: https://img.shields.io/travis/terinjokes/gulp-uglify/master.svg?label=Travis%20CI&style=flat-square
[travis-shield]: https://travis-ci.org/terinjokes/gulp-uglify
[appveyor-shield-img]: https://img.shields.io/appveyor/ci/terinjokes/gulp-uglify/master.svg?label=AppVeyor&style=flat-square
[appveyor-shield]: https://ci.appveyor.com/project/terinjokes/gulp-uglify
[npm-dl-shield-img]: https://img.shields.io/npm/dm/gulp-uglify.svg?style=flat-square
[npm-shield]: https://yarnpkg.com/en/package/gulp-uglify
[npm-v-shield-img]: https://img.shields.io/npm/v/gulp-uglify.svg?style=flat-square
[coveralls-shield-img]: https://img.shields.io/coveralls/terinjokes/gulp-uglify/master.svg?style=flat-square
[coveralls-shield]: https://coveralls.io/github/terinjokes/gulp-uglify