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A CoffeeScript loader plugin that may work with module loaders like RequireJS, curl and backdraft.

It is known to work with RequireJS 1.0+.

This loader plugin makes it easy to write your JS functionality in CoffeeScript, and easily use it in the browser, Node or Rhino. Plus, if you use the RequireJS optimizer, your CoffeeScript files can be translated to JavaScript, and inlined into optimized layers for fast performance.

In development, it uses XMLHttpRequest to fetch the .coffee files, so you can only fetch files that are on the same domain as the HTML page, and most browsers place restrictions on using XMLHttpRequest from local file URLs, so use a web server to serve your .coffee files.



To install with Volo:

  volo add require-cs

This will install cs.js and coffee-script.js into the baseUrl folder, and no further configuration is necessary.


To install with Bower:

  bower install require-cs

Since bower installs require-cs and coffee-script into separate folders, add the following RequireJS package configuration:

  baseUrl: '..path_to_packages..'
  packages: [
      name: 'cs',
      location: 'require-cs',
      main: 'cs'
      name: 'coffee-script',
      location: 'coffeescript',
      main: 'extras/coffee-script'

Manual Download

  1. Download CoffeeScript for the browser that registers as an AMD module. You can do that by using a "raw" GitHub URL. It takes the form of:[BRANCH-OR-VERSION]/extras/coffee-script.js

Example links:

Place this in the directory that is your baseUrl for your project, or set up a paths config for it for the module ID coffee-script. The cs.js file specifies coffee-script as a dependency.

  1. Download the latest version of cs.js.


Reference CoffeeScript files via the cs! plugin name. For example, to load the file that is in your baseUrl directory:

require(['cs!app'], function (app) {


Or, if creating a module that depends on

define(['cs!util'], function (util) {

If you are using define() in a module written with CoffeeScript:

define ['cs!util'], (util) ->

Literate CoffeeScript was introduced in CoffeeScript 1.5.0. To utilize this feature with this plugin you will need to have downloaded >= 1.5.0 of CoffeeScript and qualify the file (with extension) of the literate module you wish to use.

A dependency on the literate module app.litcoffee:

require ['cs!app.litcoffee'], (litapp) ->
  # ...

Or a dependency on the literate module

define ['cs!'], (litutil) ->
  # ...

Note: This plugin supports a mixture of literate and regular CoffeeScript files in the same project.

VERY IMPORTANT: Only define anonymous modules using CoffeeScript. Otherwise, the optimization work will not happen correctly — the name of the module is changed to allow inlining of the translated JS content.

Complete web project

The demo directory shows a complete web example. See the demo/index.html file as the entry point into the demo. It is not a fancy demo, just shows basic use.

If you have node installed and need to run a web server to try out the demo, in this directory run npm install send, then start up the demo web server by running:

node demoserver.js


See demo/ for an example build script that drives the optimizer with the demo/build.js build config.

The build will generate a demo-build directory with the optimized files. Where the unoptimized demo directory will load 7 files, the optimized one only loads 2, and the CoffeeScript files have been converted to JavaScript. Since all the CoffeeScript modules have been converted to JS after the build, the CoffeeScript module and the source cs.js module are not included/needed in the built file.

If you want to do dynamic loading of CoffeeScript files after a build, then comment out stubModules: ['cs'] and exclude: ['coffee-script'] from the build file so that they will be included in the build.



Code of Conduct

jQuery Foundation Code of Conduct.


An AMD loader plugin for CoffeeScript




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