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95 lines
3.3 KiB
95 lines
3.3 KiB
2 years ago
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# 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]
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> Minify JavaScript with UglifyJS3.
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## Installation
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Install package with NPM and add it to your development dependencies:
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`npm install --save-dev gulp-uglify`
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## Usage
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```javascript
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var gulp = require('gulp');
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var uglify = require('gulp-uglify');
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var pipeline = require('readable-stream').pipeline;
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gulp.task('compress', function () {
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return pipeline(
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gulp.src('lib/*.js'),
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uglify(),
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gulp.dest('dist')
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);
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});
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```
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To help properly handle error conditions with Node streams, this project
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recommends the use of
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[`pipeline`](https://nodejs.org/docs/latest/api/stream.html#stream_stream_pipeline_streams_callback),
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from [`readable-stream`](https://github.com/nodejs/readable-stream).
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## Options
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Most of the [minify options](https://github.com/mishoo/UglifyJS2#minify-options) from
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the UglifyJS API are supported. There are a few exceptions:
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1. The `sourceMap` option must not be set, as it will be automatically configured
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based on your Gulp configuration. See the documentation for [Gulp sourcemaps][gulp-sm].
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[gulp-sm]: https://github.com/gulp-sourcemaps/gulp-sourcemaps#usage
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## Errors
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`gulp-uglify` emits an 'error' event if it is unable to minify a specific file.
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The GulpUglifyError constructor is exported by this plugin for `instanceof` checks.
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It contains the following properties:
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- `fileName`: The full file path for the file being minified.
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- `cause`: The original UglifyJS error, if available.
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Most UglifyJS error messages have the following properties:
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- `message` (or `msg`)
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- `filename`
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- `line`
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To see useful error messages, see [Why Use Pipeline?](docs/why-use-pipeline/README.md#why-use-pipeline).
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## Using a Different UglifyJS
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By default, `gulp-uglify` uses the version of UglifyJS installed as a dependency.
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It's possible to configure the use of a different version using the "composer" entry point.
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```javascript
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var uglifyjs = require('uglify-js'); // can be a git checkout
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// or another module (such as `uglify-es` for ES6 support)
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var composer = require('gulp-uglify/composer');
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var pump = require('pump');
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var minify = composer(uglifyjs, console);
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gulp.task('compress', function (cb) {
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// the same options as described above
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var options = {};
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pump([
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gulp.src('lib/*.js'),
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minify(options),
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gulp.dest('dist')
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],
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cb
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);
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});
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```
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[travis-shield-img]: https://img.shields.io/travis/terinjokes/gulp-uglify/master.svg?label=Travis%20CI&style=flat-square
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[travis-shield]: https://travis-ci.org/terinjokes/gulp-uglify
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[appveyor-shield-img]: https://img.shields.io/appveyor/ci/terinjokes/gulp-uglify/master.svg?label=AppVeyor&style=flat-square
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[appveyor-shield]: https://ci.appveyor.com/project/terinjokes/gulp-uglify
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[npm-dl-shield-img]: https://img.shields.io/npm/dm/gulp-uglify.svg?style=flat-square
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[npm-shield]: https://yarnpkg.com/en/package/gulp-uglify
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[npm-v-shield-img]: https://img.shields.io/npm/v/gulp-uglify.svg?style=flat-square
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[coveralls-shield-img]: https://img.shields.io/coveralls/terinjokes/gulp-uglify/master.svg?style=flat-square
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[coveralls-shield]: https://coveralls.io/github/terinjokes/gulp-uglify
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