Table of Contents
Install
Install with npm:
npm install --save-dev webpack
Install with yarn:
yarn add webpack --dev
Introduction
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.
Learn about webpack through videos!
Get Started
Check out webpack's quick Get Started guide and the other guides.
Browser Compatibility
Webpack supports all browsers that are ES5-compliant (IE8 and below are not supported).
Webpack also needs Promise for import() and require.ensure(). If you want to support older browsers, you will need to load a polyfill before using these expressions.
Concepts
Webpack has a rich plugin
interface. Most of the features
within webpack itself use this plugin interface. This makes webpack very
flexible.
Webpack can generate HTML pages and extract CSS files itself, both experimental —
see what that covers, and what still needs a plugin, for
CSS and
HTML.
| Name |
Status |
Install Size |
Description |
| compression-webpack-plugin |
 |
 |
Prepares compressed versions of assets to serve them with Content-Encoding |
| html-bundler-webpack-plugin |
 |
 |
Renders a template (EJS, Handlebars, Pug) with referenced source asset files into HTML. |
| pug-plugin |
 |
 |
Renders Pug files to HTML, extracts JS and CSS from sources specified directly in Pug. |
Webpack enables the 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.
JavaScript, JSON and assets need no
loader, and CSS and
HTML have experimental
built-in support — but preprocessors and template engines keep their loaders.
JSON
| Name |
Status |
Install Size |
Description |
 |
 |
 |
Loads and transpiles a CSON file |
Transpiling
| Name |
Status |
Install Size |
Description |
 |
 |
 |
Loads ES2015+ code and transpiles to ES5 using Babel |
 |
 |
 |
Loads TypeScript like JavaScript |
|
 |
 |
Loads CoffeeScript like JavaScript |
Templating
| Name |
Status |
Install Size |
Description |
 |
 |
 |
Compiles Pug to a function or HTML string, useful for use with Vue, React, Angular |
 |
 |
 |
Compiles Markdown to HTML |
 |
 |
 |
Loads and transforms a HTML file using PostHTML |
 |
 |
 |
Compiles Handlebars to HTML |
Styling
| Name |
Status |
Install Size |
Description |
 |
 |
 |
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 |
Frameworks
| Name |
Status |
Install Size |
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 |
 |
 |
 |
Official Svelte loader |
Webpack uses async I/O and has multiple caching levels. This makes webpack fast
and incredibly fast on incremental compilations.
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.
Webpack allows you to split your codebase into multiple chunks. Chunks are
loaded asynchronously at runtime. This reduces the initial loading time.
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.
If you're working on webpack itself, or building advanced plugins or integrations, the tools below can help you explore internal mechanics, debug plugin life-cycles, and build custom tooling.
Instrumentation
| Name | Status
Webpack 是一个面向 JavaScript 及相关文件的模块打包工具：它把许多模块（JS、CSS、图片、JSON 等）打包成少数几个资源文件，供浏览器使用。