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<h1><img src="https://terser.org/img/terser-banner-logo.png" alt="Terser" width="400"></h1> [![NPM Version][npm-image]][npm-url] [![NPM Downloads][downloads-image]][downloads-url] [![Travis Build][travis-image]][travis-url] [![Opencollective financial contributors][opencollective-contributors]][opencollective-url] A JavaScript mangler/compressor toolkit for ES6+. *note*: <s>You can support this project on patreon: [link]</s> **The Terser Patreon is shutting down in favor of opencollective**. Check out [PATRONS.md](https://github.com/terser/terser/blob/master/PATRONS.md) for our first-tier patrons. Terser recommends you use RollupJS to bundle your modules, as that produces smaller code overall. *Beautification* has been undocumented and is *being removed* from terser, we recommend you use [prettier](https://npmjs.com/package/prettier). Find the changelog in [CHANGELOG.md](https://github.com/terser/terser/blob/master/CHANGELOG.md) [npm-image]: https://img.shields.io/npm/v/terser.svg [npm-url]: https://npmjs.org/package/terser [downloads-image]: https://img.shields.io/npm/dm/terser.svg [downloads-url]: https://npmjs.org/package/terser [travis-image]: https://app.travis-ci.com/terser/terser.svg?branch=master [travis-url]: https://app.travis-ci.com/github/terser/terser [opencollective-contributors]: https://opencollective.com/terser/tiers/badge.svg [opencollective-url]: https://opencollective.com/terser Why choose terser? ------------------ `uglify-es` is [no longer maintained](https://github.com/mishoo/UglifyJS2/issues/3156#issuecomment-392943058) and `uglify-js` does not support ES6+. **`terser`** is a fork of `uglify-es` that mostly retains API and CLI compatibility with `uglify-es` and `uglify-js@3`. Install ------- First make sure you have installed the latest version of [node.js](http://nodejs.org/) (You may need to restart your computer after this step). From NPM for use as a command line app: npm install terser -g From NPM for programmatic use: npm install terser # Command line usage <!-- CLI_USAGE:START --> terser [input files] [options] Terser can take multiple input files. It's recommended that you pass the input files first, then pass the options. Terser will parse input files in sequence and apply any compression options. The files are parsed in the same global scope, that is, a reference from a file to some variable/function declared in another file will be matched properly. Command line arguments that take options (like --parse, --compress, --mangle and --format) can take in a comma-separated list of default option overrides. For instance: terser input.js --compress ecma=2015,computed_props=false If no input file is specified, Terser will read from STDIN. If you wish to pass your options before the input files, separate the two with a double dash to prevent input files being used as option arguments: terser --compress --mangle -- input.js ### Command line options ``` -h, --help Print usage information. `--help options` for details on available options. -V, --version Print version number. -p, --parse <options> Specify parser options: `acorn` Use Acorn for parsing. `bare_returns` Allow return outside of functions. Useful when minifying CommonJS modules and Userscripts that may be anonymous function wrapped (IIFE) by the .user.js engine `caller`. `expression` Parse a single expression, rather than a program (for parsing JSON). `spidermonkey` Assume input files are SpiderMonkey AST format (as JSON). -c, --compress [options] Enable compressor/specify compressor options: `pure_funcs` List of functions that can be safely removed when their return values are not used. -m, --mangle [options] Mangle names/specify mangler options: `reserved` List of names that should not be mangled. --mangle-props [options] Mangle properties/specify mangler options: `builtins` Mangle property names that overlaps with standard JavaScript globals and DOM API props. `debug` Add debug prefix and suffix. `keep_quoted` Only mangle unquoted properties, quoted properties are automatically reserved. `strict` disables quoted properties being automatically reserved. `regex` Only mangle matched property names. `reserved` List of names that should not be mangled. -f, --format [options] Specify format options. `preamble` Preamble to prepend to the output. You can use this to insert a comment, for example for licensing information. This will not be parsed, but the source map will adjust for its presence. `quote_style` Quote style: 0 - auto 1 - single 2 - double 3 - original `wrap_iife` Wrap IIFEs in parenthesis. Note: you may want to disable `negate_iife` under compressor options. `wrap_func_args` Wrap function arguments in parenthesis. -o, --output <file> Output file path (default STDOUT). Specify `ast` or `spidermonkey` to write Terser or SpiderMonkey AST as JSON to STDOUT respectively. --comments [filter] Preserve copyright comments in the output. By default this works like Google Closure, keeping JSDoc-style comments that contain e.g. "@license", or start with "!". You can optionally pass one of the following arguments to this flag: - "all" to keep all comments - `false` to omit comments in the output - a valid JS RegExp like `/foo/` or `/^!/` to keep only matching comments. Note that currently not *all* comments can be kept when compression is on, because of dead code removal or cascading statements into sequences. --config-file <file> Read `minify()` options from JSON file. -d, --define <expr>[=value] Global definitions. --ecma <version> Specify ECMAScript release: 5, 2015, 2016, etc. -e, --enclose [arg[:value]] Embed output in a big function with configurable arguments and values. --ie8 Support non-standard Internet Explorer 8