How to update webpack config for a react project created using create-react-app?

Question

I have created a react project using create-react-app. Now I need to update the webpack config, but I don't find the file anywhere. Do I need to create this file myself or what is the process? I am new to react and not really sure how to proceed from here.

Solution 1

No need to run npm run eject

Step 1

npm install react-app-rewired --save-dev

Step 2

Add config-overrides.js to the project root directory.(NOT ./src)

// config-overrides.js
module.exports = function override(config, env) {
    // New config, e.g. config.plugins.push...
    return config
}

Step 3

'Flip' the existing calls to react-scripts in npm scripts for start, build and test

/* package.json */
"scripts": {
    -   "start": "react-scripts start",
    +   "start": "react-app-rewired start",
    -   "build": "react-scripts build",
    +   "build": "react-app-rewired build",
    -   "test": "react-scripts test",
    +   "test": "react-app-rewired test",
        "eject": "react-scripts eject"
}

Step 4

Restart your app. Done

Solution 2

Option 1 - Eject your CRA

If you've just created your app using CRA, and haven't made big changes to it, you could use npm run eject - more about it here

Keep in mind that there is no going back (except by commits, of course) after doing this. This will basically provide you with webpack file and other files which are currently 'hidden' in CRA

Some critiques and second thoughts about this method here

Option 2 - React App Rewired

This might be the right choice for you. This allows you to extend your current webpack without ejecting, or messing up / making too many changes at your project as npm run eject will. Take a look at the package here

A great tutorial by Egghead.io using react-app-rewired here

Solution 3

I solved this problem by running a script between yarn install and yarn build. After yarn install the webpack.config.json file is generated, then immediately run a script on Node that modifies it, and then run the build.

My code:
custom.webpack.config.js

const fs = require('fs')

// WebPack.config File
const fileConfig = 'node_modules/react-scripts/config/webpack.config.js'

new Promise((resolve) => {
   fs.readFile(fileConfig, 'utf8', function (err, data) {
      if (err) {
        return console.log(err)
      }
      resolve(data)
   })
}).then((file) => {
    
    let CodeAsString = "Code as String to save"

    let regexCode = /YourCodeRegex}/g

    let result = file.replace(regexCode, CodeAsString)

    fs.writeFile(fileConfig, result, function (err) {
        if (err) return console.log(err)
        console.log('The webpack.config file was modifed!')
    })
})

So, now do you need to edit the package.json to include this code in the process:

"scripts": {
    "prestart": "node custom.webpack.config.js",
    "prebuild": "node custom.webpack.config.js",
    "start": "react-scripts start",
    "build": "react-scripts build"
}

Done! :)

Solution 4

Webpack configuration is being handled by react-scripts. I assume that you don't want to eject and just want to look at the config, you will find them in /node_modules/react-scripts/config

webpack.config.dev.js. //used by `npm start`
webpack.config.prod.js //used by `npm run build`

Solution 5

https://www.npmjs.com/package/react-app-rewired

Complete answer is :

How to rewire your create-react-app project

Create your app using create-react-app and then rewire it.

1. Install react-app-rewired For create-react-app 2.x with Webpack 4:

npm install react-app-rewired --save-dev

For create-react-app 1.x or react-scripts-ts with Webpack 3:

npm install [email protected] --save-dev

2. Create a config-overrides.js file in the root directory

/* config-overrides.js */
module.exports = function override(config, env) {
  //do stuff with the webpack config...
  return config;
}

like this:

+-- your-project
|   +-- config-overrides.js
|   +-- node_modules
|   +-- package.json
|   +-- public
|   +-- README.md
|   +-- src

for example :

module.exports = function override(config, env) {
    // New config, e.g. config.plugins.push...

    config.module.rules = [...config.module.rules, 
        {
            test: /\.m?js/,
            resolve: {
              fullySpecified: false
            }
        }
      ]

    return config
}

3. 'Flip' the existing calls to react-scripts in npm scripts for start, build and test

from:

/* package.json */

  "scripts": {
   "start": "react-scripts start",
   "build": "react-scripts build",
   "test": "react-scripts test",
   "eject": "react-scripts eject"
}

To:

/* package.json */

  "scripts": {
   "start": "react-app-rewired start",
   "build": "react-app-rewired build",
   "test": "react-app-rewired test",
   "eject": "react-scripts eject"
}

Note: Do NOT flip the call for the eject script. That gets run only once for a project, after which you are given full control over the webpack configuration making react-app-rewired no longer required. There are no configuration options to rewire for the eject script.

4. Start the Dev Server

npm start

5. Build your app

npm run build

View more solutions

Comments

[strg]

An another option can be craco

[BrS]

This is not good. It will revert to original configuration after npm install.

[Mohamed Jakkariya]

I was using it still now I'm not got any issues with that. I think you are not trying. If you're not okay with this go and install some other dependencies. That's fine :) Don't say anything without try.

[Butri]

did not work for me

[RiverTwilight]

@Butri As the answer is simlified it's recommended for you to check the full doc. :-)