Alpha version of FuseJS
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About Alpha

FuseJS is currently in alpha. This means we are feature/API incomplete and buggy. This release is not intended for production use.


Most popular JavaScript frameworks share similar features and functionality such as DOM manipulation, event registration, and CSS selector engines. FuseJS attempts to incorporate the strengths of these frameworks into one stable, efficient, and optimized core JavaScript framework.

FuseJS is the first JavaScript framework to use cross-browser/environment sandboxed natives. This allows FuseJS to extend Array, String, Number, Date, and RegExp object prototypes without polluting the native objects of the host environment.

FuseJS emphasizes browser capability testing, method forking, and lazy method definitions for maintainability and performance. FuseJS also adheres to ECMA 2.62 (5th edition) specifications. FuseJS is designed to eventually allow customized builds, including one of seven supported CSS selector engines. FuseJS is released under the MIT license and will have in-line documentation/minification support.

FuseJS will be able emulate other frameworks1 by creating a shell of the target framework and mapping all API calls to FuseJS's core. As more frameworks are emulated FuseJS will gain bug fixes and features which are shared between all emulated frameworks. Because of FuseJS's optimized core each emulated framework should, as a whole, perform better than their official counterpart. In most cases a developer could simply replace a supported client-side framework with FuseJS + emulation layer and receive instant performance and stability gains while continuing to use the framework API they are familiar with.

Targeted platforms

FuseJS currently targets the following platforms:

  • Microsoft Internet Explorer for Windows, version 6.0 and higher
  • Mozilla Firefox 1.5 and higher
  • Apple Safari 2.0.0 and higher
  • Google Chrome 1.0 and higher
  • Opera 9.25 and higher

Building FuseJS from source

fuse.js is a composite file generated from many source files in the src/ directory. To build FuseJS, you'll need:

From the root FuseJS directory,

  • rake dist will preprocess the FuseJS source using ERB and generate the composite dist/fuse.js.

Contributing to FuseJS

Check out the FuseJS source with $ git clone git:// $ cd fusejs $ git submodule init $ git submodule update


  1. PrototypeJS emulation will be supported in beta.