haroenv / customize-cra

Override webpack configurations for create-react-app 2.0

customize-cra

This project piggybacks on react-app-rewired to customize create-react-app for version 2.0 and higher.

How to install

⚠️ make sure you have react-app-rewired installed. You need to use this project with react-app-rewired; be sure to read their docs if you never have. The code in this project, documented below, is designed to work inside of react-app-rewired's config-overrides.js file.

npm

npm install customize-cra --save-dev

yarn

yarn add customize-cra --dev

Warning

"Stuff can break" - Dan Abramov

Using this library will override default behavior and configuration of create-react-app, and therefore invalidate the guarentees that come with it. Use with discretion!

Overview

To start, this project will export methods I need for what I'm using CRA for, but PRs will of course be welcome.

The functions documented below can be imported by name, and used in your config-overrides.js file, as explained below.

Available plugins

addBabelPlugin(plugin)

Adds a babel plugin. Whatever you pass for plugin will be added to Babel's plugins array. Consult their docs for more info.

addDecoratorsLegacy()

Add decorators in legacy mode. Be sure to have @babel/plugin-proposal-decorators installed.

disableEsLint()

Does what it says. You may need this along with addDecoratorsLegacy in order to get decorators and exports to parse together.

addWebpackAlias(alias)

Adds the provided alias info into webpack's alias section. Pass an object literal with as many entries as you'd like, and the whole object will be merged in.

addBundleVisualizer(options)

Adds the bundle visualizer plugin to your webpack config. Be sure to have webpack-bundle-analyzer installed. By default, the options passed to the plugin will be

{
  analyzerMode: "static",
  reportFilename: "report.html"
}

which can be overridden with the (optional) options argument.

adjustWorkbox(fn)

Adjusts Workbox configuration. Pass a function which will be called with the current Workbox configuration, in which you can mutate the config object as needed. See below for an example.

Using the plugins

To use these plugins, import the override function, and call it with whatever plugins you need. Each of these plugin invocations will return a new function, that override will call with the newly modified config object. Falsy values will be ignored though, so if you need to conditionally apply any of these plugins, you can do so like below.

For example

const { override, addDecoratorsLegacy, disableEsLint, addBundleVisualizer, addWebpackAlias, adjustWorkbox } = require("customize-cra");
const path = require("path");

module.exports = override(
  addDecoratorsLegacy(),
  disableEsLint(),
  process.env.BUNDLE_VISUALIZE == 1 && addBundleVisualizer(),
  addWebpackAlias({ ["ag-grid-react$"]: path.resolve(__dirname, "src/shared/agGridWrapper.js") }),
  adjustWorkbox(wb => Object.assign(wb, { skipWaiting: true, exclude: (wb.exclude || []).concat("index.html") }))
);

MobX Users

If you want CRA 2 to work with MobX, use the addDecoratorsLegacy and disableEsLint.