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webpack

webpack is a module bundler. Its main purpose is to bundle JavaScript files for usage in a browser, yet it is also capable of transforming, bundling, or packaging just about any resource or asset.

Install

npm install --save-dev webpack

Introduction

The README reflects webpack v2.x, webpack v1.x documentation can be found here.

webpack is a bundler for modules. The main purpose is to bundle JavaScript files for usage in a browser, yet it is also capable of transforming, bundling, or packaging just about any resource or asset.

TL;DR

• Bundles ES Modules, CommonJS and AMD modules (even combined).
• Can create a single bundle or multiple chunks that are asynchronously loaded at runtime (to reduce initial loading time).
• Dependencies are resolved during compilation, reducing the runtime size.
• Loaders can preprocess files while compiling, e.g. TypeScript to JavaScript, Handlebars strings to compiled functions, images to Base64, etc.
• Highly modular plugin system to do whatever else your application requires.

Get Started

Check out webpack's quick Get Started guide and the other guides.

Concepts

Plugins

webpack has a rich plugin interface. Most of the features within webpack itself use this plugin interface. This makes webpack very flexible.

Name	Status	Description
common-chunks-webpack-plugin		Generates chunks of common modules shared between entry points and splits them into separate bundles (e.g vendor.bundle.js && app.bundle.js)
extract-text-webpack-plugin		Extracts Text (CSS) from your bundles into a separate file (app.bundle.css)
component-webpack-plugin		Use components with webpack
compression-webpack-plugin		Prepare compressed versions of assets to serve them with Content-Encoding
i18n-webpack-plugin		Adds i18n support to your bundles
html-webpack-plugin		Simplifies creation of HTML files (index.html) to serve your bundles

Loaders

webpack enables use of loaders to preprocess files. This allows you to bundle any static resource way beyond JavaScript. You can easily write your own loaders using Node.js.

Loaders are activated by using loadername! prefixes in require() statements, or are automatically applied via regex from your webpack configuration.

Files

Name	Status	Description
raw-loader		Loads raw content of a file (utf-8)
val-loader		Executes code as module and consider exports as JS code
url-loader		Works like the file loader, but can return a Data Url if the file is smaller than a limit
file-loader		Emits the file into the output folder and returns the (relative) url

JSON

Name	Status	Description
		Loads a JSON file (included by default)
		Loads and transpiles a JSON 5 file
		Loads and transpiles a CSON file

Transpiling

Name	Status	Description
<script>		Executes a JavaScript file once in global context (like in script tag), requires are not parsed
		Loads ES2015+ code and transpiles to ES5 using Babel
		Loads ES2015+ code and transpiles to ES5 using Traceur
		Loads TypeScript like JavaScript
		Loads CoffeeScript like JavaScript

Templating

Name	Status	Description
		Exports HTML as string, require references to static resources
		Loads Pug templates and returns a function
		Loads Jade templates and returns a function
		Compiles Markdown to HTML
		Loads and transforms a HTML file using PostHTML
		Compiles Handlebars to HTML

Styling

Name	Status	Description
<style>		Add exports of a module as style to DOM
		Loads CSS file with resolved imports and returns CSS code
		Loads and compiles a LESS file
		Loads and compiles a SASS/SCSS file
		Loads and compiles a Stylus file
		Loads and transforms a CSS/SSS file using PostCSS

Linting && Testing

Name	Status	Description
		Tests with mocha (Browser/NodeJS)
		PreLoader for linting code using ESLint
		PreLoader for linting code using JSHint
		PreLoader for code style checking using JSCS

Frameworks

Name	Status	Description
		Loads and compiles Vue Components
		Process HTML & CSS with preprocessor of choice and require() Web Components like first-class modules
		Loads and compiles Angular 2 Components
		Riot official webpack loader

Performance

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

Module Formats

webpack supports ES2015+, CommonJS and AMD modules out of the box. It performs clever static analysis on the AST of your code. It even has an evaluation engine to evaluate simple expressions. This allows you to support most existing libraries out of the box.

Code Splitting

webpack allows you to split your codebase into multiple chunks. Chunks are loaded asynchronously at runtime. This reduces the initial loading time.

Optimizations

webpack can do many optimizations to reduce the output size of your JavaScript by deduplicating frequently used modules, minifying, and giving you full control of what is loaded initially and what is loaded at runtime through code splitting. It can also make your code chunks cache friendly by using hashes.

Contributing

Most of the time, if webpack is not working correctly for you it is a simple configuration issue.

If you are still having difficulty after looking over your configuration carefully, please post a question to StackOverflow with the webpack tag. Questions that include your webpack.config.js and relevant files are more likely to receive responses.

If you have discovered a bug or have a feature suggestion, feel free to create an issue on Github.

If you create a loader or plugin, please consider open sourcing it, putting it on npm and following the x-loader, x-webpack-plugin convention.

You are also welcome to correct any spelling mistakes or any language issues.

If you want to discuss something or just need help, here is our Gitter room.

License

Core Team

Sponsoring

Most of the core team members, webpack contributors and contributors in the ecosystem do this open source work in their free time. If you use webpack for a serious task, and you'd like us to invest more time on it, please donate. This project increases your income/productivity too. It makes development and applications faster and it reduces the required bandwidth.

This is how we use the donations:

• Allow the core team to work on webpack
• Thank contributors if they invested a large amount of time in contributing
• Support projects in the ecosystem that are of great value for users
• Support projects that are voted most (work in progress)
• Infrastructure cost
• Fees for money handling

Premium Partners

Other Backers and Sponsors

Before we started using OpenCollective, donations were made anonymously. Now that we have made the switch, we would like to acknowledge these sponsors (and the ones who continue to donate using OpenCollective). If we've missed someone, please send us a PR, and we'll add you to this list.

Google Angular Team, Architects.io,

Sponsors

Become a sponsor and get your logo on our README on Github with a link to your site.

Backers

Become a backer and get your image on our README on Github with a link to your site.

Thanks to

(In chronological order)

• @google for Google Web Toolkit (GWT), which aims to compile Java to JavaScript. It features a similar Code Splitting as webpack.
• @medikoo for modules-webmake, which is a similar project. webpack was born because I wanted Code Splitting for modules-webmake. Interestingly the Code Splitting issue is still open (thanks also to @Phoscur for the discussion).
• @substack for browserify, which is a similar project and source for many ideas.
• @jrburke for require.js, which is a similar project and source for many ideas.
• @defunctzombie for the browser-field spec, which makes modules available for node.js, browserify and webpack.
• Every early webpack user, which contributed to webpack by writing issues or PRs. You influenced the direction...
• @shama, @jhnns and @sokra for maintaining this project
• Everyone who has written a loader for webpack. You are the ecosystem...
• Everyone I forgot to mention here, but also influenced webpack.

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Javascript Licenses Website Go1.9

Tobias Koppers Core Founder of webpack

Johannes Ewald Loaders & Plugins Early adopter of webpack

Sean T. Larkin Public Relations Founder of the core team

Juho Vepsäläinen Documentation Author

Kees Kluskens Development Sponsor