webpack

Packs CommonJs/AMD modules for the browser. Allows to split your codebase into multiple bundles, which can be loaded on demand. Support loaders to preprocess files, i.e. json, jade, coffee, css, less, ... and your custom stuff.

npm install webpack
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webpack

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Introduction

webpack is a bundler for modules. The main purpose is to bundle javascript files for usage in browser.

TL;DR

  • bundles CommonJs and AMD modules. (even combined)
  • can create a single bundle or a bunch of chunks loaded on demand, to reduce initial loading time.
  • dependencies are resolved while compiling, this makes the runtime very small
  • loader can preprocess files while compiling, i. e. coffee-script to javascript

Check the documentation if you want to know more...

Installation

project: npm install webpack --save-dev

global: npm install webpack -g

Examples

Take a look at the examples folder.

Features

Plugins

webpack has a rich plugin interface. Most of the features are internal plugins using this interface. This makes webpack very flexible.

Performance

webpack uses async I/O and has multiple caching levels. This makes webpack fast and incredible fast on incremental compilation.

Loaders

webpack allows to use loaders to preprocess files. This allows you to bundle any static resource not only javascript. You can easily write your own loaders running in node.js.

Support

webpack supports AMD and CommonJs module styles. It perform clever static analysis on the AST of your code. It even has a evaluation engine to evaluate simple expressions. This allows you to support most existing libraries.

Code Splitting

webpack allows to split your codebase into chunks. Chunks are loaded on demand. This reduces initial loading time.

Optimizations

webpack can do many optimizations to reduce the output size. It also cares about caching by using hashes.

A small example what's possible

// webpack is a module bundler
// This means webpack takes modules with dependencies
//   and emit static assets representing that modules.

// dependencies can be written in CommonJs
var commonjs = require("./commonjs");
// or in AMD
define(["amd-module", "../file"], function(amdModule, file) {
    // while previous constructs are sync
    // this is async
    require(["big-module/big/file"], function(big) {
         // for async dependencies webpack splits
         //  your application into multiple "chunks".
         // This part of your application is
         //  loaded on demand (Code Splitting)
        var stuff = require("../my/stuff");
        // "../my/stuff" is also loaded on demand
        //  because it's in the callback function
        //  of the AMD require
    });
});


require("coffee!./cup.coffee");
// "Loaders" can be used to preprocess files.
// They can be prefixed in the require call
//  or configured in the configuration.
require("./cup");
// This does the same when you add ".coffee" to the extensions
//  and configure the "coffee" loader for /\.coffee$/


function loadTemplate(name) {
    return require("./templates/" + name + ".jade");
    // many expression are supported in require calls
    // a clever parser extract information and concludes
    //  that everything in "./templates" that matches
    //  /\.jade$/ should be included in the bundle, as it
    //  can be required.
}


// ... and you can combine everything
function loadTemplateAsync(name, callback) {
    require(["bundle?lazy!./templates/" + name + ".jade"], 
      function(templateBundle) {
        templateBundle(callback);
    });
}

Documentation

documentation

Tests

You can run the node tests with npm test. build status

You can run the browser tests:

cd test/browsertests
node build

and open tests.html in browser.

Contribution

You are welcome to contribute by writing issues or pull requests. It would be nice if you open source your own loaders or webmodules. :)

You are also welcome to correct any spelling mistakes or any language issues, because my english is not perfect...

If you want to discus something or just need help, here is a gitter.im room.

License

Copyright (c) 2012-2014 Tobias Koppers

MIT (http://www.opensource.org/licenses/mit-license.php)

This is a freetime project. My time investment fluctuates randomly. If you use webpack for a serious task you may want me to invest more time. Or if you make some good revenue you can give some money back. Keep in mind that this project may increase your income. It makes development and applications faster and reduce the required bandwidth.

I'm very thankful for every dollar. If you leave your username or email I may show my thanks by giving you extra support.

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