https://github.com/estools/esmangle

esmangle is mangler / minifier for Mozilla Parser API AST
https://github.com/estools/esmangle

ast ecmascript estree javascript

Last synced: 1 day ago
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esmangle is mangler / minifier for Mozilla Parser API AST

• Host: GitHub
• URL: https://github.com/estools/esmangle
• Owner: estools
• License: bsd-2-clause
• Created: 2012-08-30T15:29:25.000Z (over 12 years ago)
• Default Branch: master
• Last Pushed: 2016-03-02T19:29:25.000Z (almost 9 years ago)
• Last Synced: 2025-01-14T00:09:33.764Z (8 days ago)
• Topics: ast, ecmascript, estree, javascript
• Language: JavaScript
• Homepage: https://estools.github.io/esmangle/
• Size: 1.26 MB
• Stars: 295
• Watchers: 20
• Forks: 39
• Open Issues: 32
• Metadata Files:
  • Readme: README.md
  • License: LICENSE.BSD

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README

        
# esmangle [![NPM version][npm-image]][npm-url] [![Build Status][travis-image]][travis-url] [![Dependency Status][daviddm-url]][daviddm-image]

esmangle ([esmangle](http://github.com/estools/esmangle)) is

mangler / minifier for [Parser API](https://developer.mozilla.org/en/SpiderMonkey/Parser_API) AST.

### Install

esmangle can be used in a web browser: Download

```html

```

Node.js application via the package manager:

```sh

npm install esmangle

```

If you would like to use latest esmangle in a browser, you can build `build/esmangle.min.js`:

```sh

npm run-script build

```

### Usage

A simple example: the program

```js

var ast = esprima.parse(code);

var result = esmangle.mangle(ast);  // gets mangled AST

console.log(escodegen.generate(result));  // dump AST

```

Or you can simply use this `esmangle` command in the shell.

```sh

$ esmangle file.js

```

Get more compressed result: (in Node.js)

```js

var ast = esprima.parse(code);

// Get optimized AST

var optimized = esmangle.optimize(ast, null);

// gets mangled AST

var result = esmangle.mangle(optimized);

console.log(escodegen.generate(result, {

    format: {

        renumber: true,

        hexadecimal: true,

        escapeless: true,

        compact: true,

        semicolons: false,

        parentheses: false

    }

}));  // dump AST

```

### Design

Slide is [here](https://speakerdeck.com/constellation/escodegen-and-esmangle-using-mozilla-javascript-ast-as-an-ir).

This resolution algorithm is based on my bytecode compiler [iv / lv5 / railgun](https://github.com/Constellation/iv/tree/master/iv/lv5/railgun).

### License

Copyright (C) 2012 [Yusuke Suzuki](http://github.com/Constellation)

 (twitter: [@Constellation](http://twitter.com/Constellation)) and other contributors.

Redistribution and use in source and binary forms, with or without

modification, are permitted provided that the following conditions are met:

  * Redistributions of source code must retain the above copyright

    notice, this list of conditions and the following disclaimer.

  * Redistributions in binary form must reproduce the above copyright

    notice, this list of conditions and the following disclaimer in the

    documentation and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

ARE DISCLAIMED. IN NO EVENT SHALL  BE LIABLE FOR ANY

DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND

ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

[npm-url]: https://npmjs.org/package/esmangle

[npm-image]: https://badge.fury.io/js/esmangle.png

[travis-url]: https://travis-ci.org/estools/esmangle

[travis-image]: https://travis-ci.org/estools/esmangle.png?branch=master

[coveralls-url]: https://coveralls.io/r/estools/esmangle

[coveralls-image]: https://coveralls.io/repos/estools/esmangle/badge.png

[depstat-url]: https://david-dm.org/estools/esmangle

[depstat-image]: https://david-dm.org/estools/esmangle.png

[daviddm-url]: https://david-dm.org/estools/esmangle.png?theme=shields.io

[daviddm-image]: https://david-dm.org/estools/esmangle