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Enabling and Using CSS Modules in React JS

Here is how to enable and use CSS modules in React JS.

Step 1: Init git

git init

Step 2: Add to git

git add .

Step 3: Commit to git

git commit -m "first commit"

Step 4: Eject

npm run eject

Step 5: Make changes to config > webpack.config.js

Add the two lines commented as ADDED
// "postcss" loader applies autoprefixer to our CSS.
// "css" loader resolves paths in CSS and adds assets as dependencies.
// "style" loader turns CSS into JS modules that inject <style> tags.
// In production, we use MiniCSSExtractPlugin to extract that CSS
// to a file, but in development "style" loader enables hot editing
// of CSS.
// By default we support CSS Modules with the extension .module.css
{
test: cssRegex,
exclude: cssModuleRegex,
use: getStyleLoaders({
importLoaders: 1,
modules: true, // ADDED
localIdentName: '[name]__[local]__[hash:base64:5]', // ADDED
sourceMap: isEnvProduction && shouldUseSourceMap,
}),
// Don't consider CSS imports dead code even if the
// containing package claims to have no side effects.
// Remove this when webpack adds a warning or an error for this.
// See https://github.com/webpack/webpack/issues/6571
sideEffects: true,
}

Step 6: In App.js include css as follows

import classes from './App.css';

Step 7: Access classes in css file as follows:

<div className={classes.App}>

Step 8: Follow step 6 and 7 in all JS files.


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