webpack / analyse-tool

A tool to analyse your webpack build result. It allows to browse the compilation and points out options to optimize the build.

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.

Table of Contents

1. Install
2. Introduction
3. Concepts
4. Contributing
5. Support
6. Core Team
7. Sponsoring
8. Premium Partners
9. Other Backers and Sponsors
10. Gold Sponsors
11. Silver Sponsors
12. Bronze Sponsors
13. Backers
14. Special Thanks

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.

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

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	Install Size	Description
mini-css-extract-plugin			Extracts CSS into separate files. It creates a CSS file per JS file which contains CSS.
compression-webpack-plugin			Prepares compressed versions of assets to serve them with Content-Encoding
html-webpack-plugin			Simplifies creation of HTML files (index.html) to serve your bundles
pug-plugin			Renders Pug files to HTML, extracts JS and CSS from sources specified directly in Pug.

Loaders

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.

Files

Name	Status	Install Size	Description
val-loader			Executes code as module and considers exports as JS code

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
			Exports HTML as string, requires references to static resources
			Loads Pug templates and returns a function
			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
<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

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

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

We want contributing to webpack to be fun, enjoyable, and educational for anyone, and everyone. We have a vibrant ecosystem that spans beyond this single repo. We welcome you to check out any of the repositories in our organization or webpack-contrib organization which houses all of our loaders and plugins.

Contributions go far beyond pull requests and commits. Although we love giving you the opportunity to put your stamp on webpack, we also are thrilled to receive a variety of other contributions including:

• Documentation updates, enhancements, designs, or bugfixes
• Spelling or grammar fixes
• README.md corrections or redesigns
• Adding unit, or functional tests
• Triaging GitHub issues -- especially determining whether an issue still persists or is reproducible.
• Searching #webpack on twitter and helping someone else who needs help
• Teaching others how to contribute to one of the many webpack's repos!
• Blogging, speaking about, or creating tutorials about one of webpack's many features.
• Helping others in our webpack gitter channel.

To get started have a look at our documentation on contributing.

If you are worried or don't know where to start, you can always reach out to Sean Larkin (@TheLarkInn) on Twitter or simply submit an issue and a maintainer can help give you guidance!

We have also started a series on our Medium Publication called The Contributor's Guide to webpack. We welcome you to read it and post any questions or responses if you still need help.

Looking to speak about webpack? We'd love to review your talk abstract/CFP! You can email it to webpack [at] opencollective [dot] com and we can give pointers or tips!!!

Creating your own plugins and loaders

If you create a loader or plugin, we would <3 for you to open source it, and put it on npm. We follow the x-loader, x-webpack-plugin naming convention.

Support

We consider webpack to be a low-level tool used not only individually but also layered beneath other awesome tools. Because of its flexibility, webpack isn't always the easiest entry-level solution, however we do believe it is the most powerful. That said, we're always looking for ways to improve and simplify the tool without compromising functionality. If you have any ideas on ways to accomplish this, we're all ears!

If you're just getting started, take a look at our new docs and concepts page. This has a high level overview that is great for beginners!!

Looking for webpack 1 docs? Please check out the old wiki, but note that this deprecated version is no longer supported.

If you want to discuss something or just need help, here is our Gitter room where there are always individuals looking to help out!

If you are still having difficulty, we would love for you to post a question to StackOverflow with the webpack tag. It is much easier to answer questions that include your webpack.config.js and relevant files! So if you can provide them, we'd be extremely grateful (and more likely to help you find the answer!)

If you are twitter savvy you can tweet #webpack with your question and someone should be able to reach out and help also.

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

License

Core Team

Tobias Koppers Core Founder of webpack

Johannes Ewald Loaders & Plugins Early adopter of webpack

Sean T. Larkin Public Relations Founder of the core team

Kees Kluskens Development Sponsor

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.

Gold Sponsors

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

Silver Sponsors

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

Bronze Sponsors

Become a bronze 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.

Special 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.

analyse-tool's Issues

Team leader

We are looking for 2 - 3 team leaders for the analyse tool.

A team leader is responsible for reviewing, merging PRs and administrating the repo.

You should have at least some experience with git and open source on github.

@webpack/analyse-tool-team Please either apply yourself, propose someone or vote for somebody.

List of features we want to implement

Drop in your ideas what else (new/improved) you want to see?

• It should work realtime with webpack-dev-server and middleware
• It should feature a web-based version and an electron version
• It'd propably also give a deeper understanding of the webpack compilation and optimization options.
• It should be compatible with Webpack 1.x and 2.x
• It should be extensible (via plugins or similarly) for enthusiasts who want other ways of visualization/analysis
• It should be able to display compilation steps in a flowchart-like way, so it's visual and easy to understand sequence of build steps and transitions between them

P.S. How we'll vote for the features by the way? Anything handy in Github for that?
Not sure if +1 in comments is a clean way to do it 😒

Roadmap

• Find a team (until 18.11.)
• Select team leaders (until 22.11.)
• Gather a list of features we want to implement (ordered by importance) (until 25.11.)
• Plan the UI (multiple pages?)
• Bootstrap the basic infrastructure
  • router
  • store
  • pages
  • folders (pages?, components?)
• Implement basic loading of webpack stats
• Split the work into multiple features (on which can be worked async)
  • user friendly loading of webpack stats
• Setup infrastructure for publishing as web app (codeship?, gh-pages?)
• Infrastructure optimization (Code Splitting)
• Setup infrastructure for building as electron app

Bootstrapping the basic infrastructure

So, we've chosen the team, the team leaders, drawn upon some of the major features, I think the next step is actually getting the basic infrastructure ready. According to the roadmap, we should be doing the UI design, but I think data > view / presentation, especially since it seems we're not actually sure about what to present.

Setting up the infrastructure (router, store, pages, folders, compontents etc) is agnostic to how the view actually ends up looking like and if we can get this done before, it will be much easier to handle the view.

So, my proposal is, let's give ourselves 3 days to determine the infrastructure and frameworks / tools we're going to use and move forward.

I think it's crucial we get something working as soon as possible.

Team

I'm looking for a new team of developers/designers that want to write a new analyse tool.

It should feature a web-based version and an electron version. You are free to choose the tooling with the team, I would recommend webpack, ES6, React.js, react-router, CSS Modules, react-toolbox, Redux.

You can see it as chance to work with bleeding egde technologies and contribute to OSS. It propably also give a depther understanding of the webpack compilation and optimization options. I hope this results in a tool that helps everybody to analyse and optimize their webpack build.

Of couse the tool would feature your and/or your company's name at some place.