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UglifyJS 3 ========== UglifyJS is a JavaScript parser, minifier, compressor and beautifier toolkit. #### Note: - **`uglify-js@3` has a simplified [API](#api-reference) and [CLI](#command-line-usage) that is not backwards compatible with [`uglify-js@2`](https://github.com/mishoo/UglifyJS2/tree/v2.x)**. - **Documentation for UglifyJS `2.x` releases can be found [here](https://github.com/mishoo/UglifyJS2/tree/v2.x)**. - `uglify-js` only supports JavaScript (ECMAScript 5). - To minify ECMAScript 2015 or above, transpile using tools like [Babel](https://babeljs.io/). 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 uglify-js -g From NPM for programmatic use: npm install uglify-js # Command line usage uglifyjs [input files] [options] UglifyJS can take multiple input files. It's recommended that you pass the input files first, then pass the options. UglifyJS 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. If no input file is specified, UglifyJS 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: uglifyjs --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. `debug` Add debug prefix and suffix. `domprops` Mangle property names that overlaps with DOM properties. `keep_quoted` Only mangle unquoted properties. `regex` Only mangle matched property names. `reserved` List of names that should not be mangled. -b, --beautify [options] Beautify output/specify output options: `beautify` Enabled with `--beautify` by default. `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. -o, --output <file> Output file path (default STDOUT). Specify `ast` or `spidermonkey` to write UglifyJS 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 "@license" or "@preserve". You can optionally pass one of the following arguments to this flag: - "all" to keep all comments - 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. -e, --enclose [arg[:value]] Embed everything in a big function, with configurable argument(s) & value(s). --ie8 Support non-standard Internet Explorer 8. Equivalent to setting `ie8: true` in `minify()` for `compress`, `mangle` and `output` options. By default UglifyJS will not try to be IE-proof. --keep-fnames Do not mangle/drop function names. Useful for code relying on Function.prototype.name. --name-cache <file> File to hold mangled name mappings. --self Build UglifyJS as a library (implies --wrap UglifyJS) --source-map [options] Enable source map/specify source map options: `base` Path to compute relative paths from input files. `content` Input source map, useful if you're compressing JS that was generated from some other original code. Specify "inline" if the source map is included within the sources. `filename` Filename and/or location of the output source (sets `file` attribute in source map). `includeSources` Pass this flag if you want to include the content of source files in the source map as sourcesContent property. `root` Path to the original source to be included in the source map. `url` If specified, path to the source map to append in