How to disable minification in a React app?

To disable minification in a React app created with create-react-app (CRA) using npm, you need to modify the build process. However, CRA does not directly expose Webpack configuration without ejecting, but you can still achieve this without ejecting by using the GENERATE_SOURCEMAP environment variable and a custom build script.

Steps to Disable Minification

1. Create a .env or .env.local File: In the root of your project, create a file named .env or .env.local if it doesn’t already exist.

2. Add the GENERATE_SOURCEMAP Variable: Add the following line to the .env file to prevent CRA from minifying your code:

   GENERATE_SOURCEMAP=false
   

   This variable instructs the build process to include source maps and can effectively disable minification, making the code more readable.

3. Clean the dist directory: The npm build process doesn’t fully clear the dist directory so this step is essential.

   rm -rf ./dist
   

4. Build your project:

   To build your React app without minification, run:

   npm run build
   

5. Start your project:

   The below command may vary so please check your scripts property inside the package.json file.

   npm run dev
   

Important Notes

• Source Maps: Disabling minification via GENERATE_SOURCEMAP=false includes source maps, making it easier to debug the code.
• Performance: The non-minified code is not optimized for production, so this approach should only be used for debugging.

This method allows you to disable minification without ejecting or modifying CRA’s internal Webpack configuration.