esmangle
esmangle (esmangle) is mangler / minifier for Parser API AST.
Install
esmangle can be used in a web browser: Download
<script src="esmangle.js"></script>
Node.js application via the package manager:
npm install esmangle
If you would like to use latest esmangle in a browser, you can build build/esmangle.min.js
:
npm run-script build
Usage
A simple example: the program
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.
$ esmangle file.js
Get more compressed result: (in Node.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. This resolution algorithm is based on my bytecode compiler iv / lv5 / railgun.
License
Copyright (C) 2012 Yusuke Suzuki (twitter: @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.