webpack-advanced-techniques.md

Webpack Advanced Techniques

Build Optimization

• Webpack: Build Performance
  https://github.com/webpack/docs/wiki/build-performance
  Webpack docs on ways to speed up builds.

• How to make your webpack builds 10x faster
  http://www.slideshare.net/trueter/how-to-make-your-webpack-builds-10x-faster
  Slideshow that lists a number of approaches for making Webpack builds faster, such as narrowing scope, using the DllPlugin, using HappyPack for parallel builds, and more.

• Advanced Frontend Optimization with Webpack
  http://sokra.github.io/slides/frontend-optimize
  Slides by Webpack's original author, describing ways to improve Webpack builds.

• Fixing annoying imports in React Projects
  https://medium.com/datawallet-tech/fixing-annoying-imports-in-react-projects-895a6ad24c24
  A quick example of using Webpack's module aliasing to simplify import paths, with further discussion in the comments.

• Webpack Plugins we been keeping on the DLL
  https://medium.com/@soederpop/webpack-plugins-been-we-been-keepin-on-the-dll-cdfdd6cb8cd7
  An overview of Webpack's DllPlugin, and how it can be used for faster dev builds.

• DllPlugin usage summary
  erikras/react-redux-universal-hot-example#616 (comment)
  Notes from a user who wants to document his findings on usage of DllPlugin. Pretty thorough.

• Implement Webpack DLL Plugin for React-Boilerplate
  react-boilerplate/react-boilerplate#495
  A PR adding usage of DllPlugin to React-Boilerplate. Thorough and well-commented - should be a very useful reference to anyone trying to set it up in their own project.

• Optimizing Webpack
  http://engineering.invisionapp.com/post/optimizing-webpack/
  Explains how to use DllPlugin to pre-bundle vendor libraries for faster build times.

• Manually Tuning Webpack Builds
  https://medium.com/@xjamundx/manually-tuning-webpack-builds-284923f47f44
  Tips for cutting down bundle sizes by removing duplicate library instances and fine-tuning usage of various libraries.

• Tips for faster Webpack builds
  https://www.reddit.com/r/javascript/comments/4xuknm/webpack_dashboard/d6jdl8z
  A Reddit comment with several useful tips to follow when trying to speed up builds

• Formidable Playbook
  https://formidable.com/open-source/playbook/
  Formidable Labs describes their preferred approaches for configuring Webpack, including optimization approaches.

• Webpack Performance: The Comprehensive Guide
  lcxfs1991/blog#15
  An in-depth look at the parts that go into a Webpack build, and how each piece can be optimized for a faster build.

• Speeding up Webpack performance with parallel builds
  http://tech.trivago.com/2015/12/15/parallel-webpack/
  Describes a tool called parallel-webpack, which can build multiple entry points in multiple formats in parallel.

• A React + Webpack Optimization Case
  https://medium.com/@kudochien/a-react-webpack-optimization-case-27da392fb3ec
  Several useful examples of how to profile and optimize a Webpack-based project, including checking bundle contents, specific imports from libraries, ignoring Moment locales, and more.

• Optimizing Wepback build times and improving caching with DLL bundles
  https://robertknight.github.io/posts/webpack-dll-plugins/
  Explains the benefits of using DllPlugin for generating library bundles, shows how to configure it, and compares with other chunking methods.

• Tree-shaking ES6 Modules in Webpack 2
  https://medium.freecodecamp.com/tree-shaking-es6-modules-in-webpack-2-1add6672f31b
  A look at the concept of tree-shaking to reduce output size, how it relates to module formats, and how to configure Webpack to properly allow for tree-shaking

• Webpack tree-shaking
  https://medium.com/@johnstew/webpack-tree-shaking-20914b7a9ca5
  An explanation of what tree-shaking is, how to configure Webpack to apply it, and how it works.

Code Splitting and Chunking

• React-Router and Webpack in Production
  https://reactjsnews.com/webpack-in-production
  Tips on dynamically loading route views and optimizing chunk sizes

• Webpack Async Bundle Loading
  http://jilles.me/webpack-async-bundle-loading/
  A quick look at how to delay-load some portion of your app's code.

• Code Chunking with Webpack
  https://medium.com/react-weekly/code-chunking-with-webpack-a-pragmatic-approach-e17e8bcc6453
  Covers how to configure chunked bundles and dynamic bundle loading with Webpack and React-Router.

• Dynamic Vendor Bundling in Webpack
  https://medium.com/jeremy-gayed/dynamic-vendor-bundling-in-webpack-528993e48aab
  An approach to dynamically adding anything from node_modules to a "vendor" bundle

• Webpack Config: Commons Chunk Plugin part 1
  https://www.youtube.com/watch?v=-xzWMKuiS2o
  An intro to what the Webpack Commons Chunk Plugin does and how it works

• A beginner's step-by-step guide to Code Splitting with Webpack 2 and React Router
  http://brotzky.co/blog/a-beginners-step-by-step-guide-to-code-splitting-with-webpack-2-and-react-router/
  An excellent guide to concepts and configuration needed for code splitting.

• Lazily Load Code Declaratively in React and Webpack
  https://gist.github.com/iammerrick/f3f9edfbf5dc279af775f73020193dcc
  Demonstrates one way to request and render components on demand, using Webpack's bundle-loader

• Building Vendor and Feature Bundles with Webpack
  http://odetocode.com/blogs/scott/archive/2016/12/01/building-vendor-and-feature-bundles-with-webpack.aspx
  Demonstrates using DllPlugin to build a vendor bundle, and generating multiple bundles for different features by dynamically building up multiple entry points.

• Components a la carte
  http://darrennewton.com/2016/12/21/components-a-la-carte/
  Describes a technique for dynamically loading only certain features that a user should see

• Dynamic Imports with Webpack 2
  https://dev.to/kayis/dynamic-imports-with-webpack-2
  A quick example of how to use dynamic imports to load pages or components at runtime

Bundle Sizes and Visualization

• Building Better Bundles http://blog.isquaredsoftware.com/2016/11/posts-on-packtpub-generic-redux-modals-and-building-better-bundles/
  An article describing what process.env.NODE_ENV means, and how it is used as part of a production build process to optimize build sizes

• Chat discussion - summary of process.env.NODE_ENV and its use with Webpack
  https://gist.github.com/markerikson/6776848172c33aaa4db882627c689e18
  An overview of how the process.env.NODE_ENV variable is often used to define optimizations for Webpack production builds

• Webpack Bloat
  http://www.jamesonnetworks.com/entry/webpack-bloat
  Discussion of how to improve production configurations for smaller bundle sizes

• "Vector.im bundle is too big - analysis"
  element-hq/element-web#2498
  Web perf expert Nolan Lawson analyzes why the JS bundle for the Vector.im web app is too big, and ways it could potentially be improved using code splitting and app structure changes. A good example of ways to improve bundle sizes.

• Unlocking a Mystery: Visualizing the Common Webpack Bundles
  https://www.redfin.com/blog/2016/12/unlocking-a-mystery-visualizing-the-common-webpack-bundles.html
  A recap of some previous tools used to analyze Webpack bundle sizes, and description of a new tool they built to provide better bundle visualization

• Analysing and minimising the size of client side bundle with Webpack and source-map-explorer
  https://medium.com/@nimgrg/analysing-and-minimising-the-size-of-client-side-bundle-with-webpack-and-source-map-explorer-41096559beca
  Tips on using source-map-explorer to check the size of code included in a minified bundle, and removing unneeded polyfills

• How to use source-map-explorer with Webpack
  https://www.sivadass.in/using-source-map-explorer-with-webpack/
  Examples of using the source-map-explorer tool to visualize the contents of a bundle

• Analyzing and optimizing your Webpack bundle
  https://medium.com/@ahmedelgabri/analyzing-optimizing-your-webpack-bundle-8590818af4df
  Some quick suggestions for using CLI flags to show sizes of bundled chunks, and using webpack-bundle-analyzer and IgnorePlugin to exclude unneeded files.

Hot Module Replacement

• Webpack and Hot Module Replacement
  https://medium.com/@rajaraodv/webpack-hot-module-replacement-hmr-e756a726a07
  A great in-depth walkthrough of how HMR works

• Webpack's HMR and React Hot-Loader - The Missing Manual
  https://medium.com/@rajaraodv/webpacks-hmr-react-hot-loader-the-missing-manual-232336dc0d96
  Demonstrates three ways to enable HMR, and usage with three different React application scenarios

• Hot Reloading in React
  https://medium.com/@dan_abramov/hot-reloading-in-react-1140438583bf
  Dan Abramov walks through the history of his React Hot Loader and React Transform tools, describes their implementation, flaws, and weaknesses, and looks at a potential solution (later implemented in React Hot Loader 3.0).

• HMR Tutorial Series
  http://andrewhfarmer.com/why-use-hmr/
  http://andrewhfarmer.com/understanding-hmr/
  http://andrewhfarmer.com/3-ways-webpack-hmr/
  http://andrewhfarmer.com/webpack-hmr-tutorial/
  A very readable and informative series of articles on using HMR.

• Live Editing Javascript with Webpack
  http://jlongster.com/Backend-Apps-with-Webpack--Part-III
  Some interesting and advanced tricks for ways HMR could be used.

• Using React with "plain" Webpack HMR
  reduxjs/redux#1455
  Dan Abramov removes use of the React-Transform plugin from Redux's examples, and demonstrates how to use the "plain" Webpack HMR API to do reloading of updated components, reducers, and other code.

• Basic HMR Usage Example
  https://gist.github.com/markerikson/dc6cee36b5b6f8d718f2e24a249e0491
  An extracted example demonstrating using "plain" HMR to reload components, reducers, and even sagas.

• React - Hot Module Reload
  https://medium.com/@baphemot/react-hot-module-reload-f6b3d34b9b86
  An explanation of how to set up HMR using React-Hot-Loader 3.0

• Adding HMR to Create-React-App
  http://chrisshepherd.me/posts/adding-hot-module-reloading-to-create-react-app
  A quick example of the basic pattern for using plain HMR with Webpack

• Webpack Hot Reloading and React
  https://ctheu.com/2015/12/29/webpack-hot-reloading-and-react-how/
  An explanation of how Hot Reloading works, and how the various pieces fit together.

• ReactCasts #7: Hot Module Replacement in Create-React-App
  https://www.youtube.com/watch?v=hcl3lNjgj-E
  A screencast talking about what HMR is, and two ways to add it to projects created with Create-React-App

• "Difference between Webpack HMR and React-Hot-Loader?"
  facebook/create-react-app#1063 (comment)
  Dan Abramov clarifies that HMR is the API and capability that Webpack gives you, while React-Hot-Loader is a specialized tool that uses the HMR API to automatically add HMR handling to React code.

Other Tips and Examples

• Course: Using Webpack for Production Javascript Apps
  https://egghead.io/courses/using-webpack-for-production-javascript-applications
  A video course by Kent C. Dodds, covering a number of very useful Webpack techniques for real-world apps. Requires an Egghead subscription, but solid and useful info.

• Javascript at Tumblr - Switching to Webpack
  https://javascript.tumblr.com/post/143583264647/here-at-tumblr-we-use-a-js-bundler-to-compile-our
  Tumblr's dev team talks about switching from Browserify to Webpack, their migration steps, and some useful tips learned about pieces like CommonsChunkPlugin.

• Webpack HTML plugin in a Nutshell
  http://www.jonathan-petitcolas.com/2016/01/23/webpack-html-plugin-in-a-nutshell.html
  Looks at what the HTML Webpack plugin can do and how to use it.

• Truly Multiple Entries with Webpack
  https://kuzzmi.com/blog/truly-multiple-entries-with-webpack
  Instructions on how to configure multiple entry points properly

• Long-term caching of static assets with Webpack
  https://medium.com/@okonetchnikov/long-term-caching-of-static-assets-with-webpack-1ecb139adb95
  Gathers documentation on proper use of asset caching into one article to act as a complete guide.

• Goodbye "../../../"
  http://davidboyne.co.uk/2016/04/29/react-webpack-gem.html
  Tips and discussion on removing relative paths when importing

• Using the HTML Webpack Plugin for generating HTML files
  http://javascriptplayground.com/blog/2016/07/webpack-html-plugin/
  Basic instructions for setting up the HTML Webpack plugin

• Setting up CSS Modules with React and Webpack
  http://javascriptplayground.com/blog/2016/07/css-modules-webpack-react/
  Covers setting up and configuring Webpack to use CSS Modules for styling

• Webpack Map Entity Loader
  http://drhayes.io/secret-game/map-entity-loader.html
  A small example of writing a custom Webpack loader for game data

• Webpack Tricks
  https://github.com/rstacruz/webpack-tricks
  A useful list of tips for improving Webpack usage

• Useful Webpack DefinePlugin Usage
  http://tomasalabes.me/blog/_site/web-development/2017/01/03/Useful-Webpack-Define-Plugin-Usages.html
  Several useful tips and use cases for using the Webpack DefinePlugin, including logging, feature flags, and handling multiple environments

• Artsy Webpack Tour
  https://github.com/TheLarkInn/artsy-webpack-tour
  Sean Larkin of the Webpack core team gives a visually annotated tour of the Webpack 2 source code

• Squeezing Webpack into backend frameworks
  https://infinum.co/the-capsized-eight/squeezing-webpack-into-backend-frameworks
  Covers how to use Webpack to replace the Rails asset pipeline

Webpack Tools

• Webpack Dashboard
  https://github.com/FormidableLabs/webpack-dashboard
  A CLI dashboard for your webpack dev server

• Webpack Visualizer
  https://chrisbateman.github.io/webpack-visualizer/
  A tool and plugin to visualize the (pre-minified) sizes of files in a Webpack bundle

• Webpack Bundle Analyzer
  https://github.com/th0r/webpack-bundle-analyzer
  Webpack plugin and CLI utility that represents bundle content as convenient interactive zoomable treemap, and can parse minified bundles to show true minified (and gzipped) sizes

• source-map-explorer
  https://github.com/danvk/source-map-explorer
  Analyze and debug JavaScript (or Sass or LESS) code bloat through source maps. Help determine which file each byte in your minified code came from.