Adding A CSS Modules Stylesheet

Note: this feature is available with react-scripts@2.0.0 and higher.

This project supports CSS Modules alongside regular stylesheets using the [name].module.css file naming convention. CSS Modules allows the scoping of CSS by automatically creating a unique classname of the format [filename]\_[classname]\_\_[hash].

Tip: Should you want to preprocess a stylesheet with Sass then make sure to follow the installation instructions and then change the stylesheet file extension as follows: [name].module.scss or [name].module.sass.

CSS Modules let you use the same CSS class name in different files without worrying about naming clashes. Learn more about CSS Modules here.

Button.module.css

.error {
  background-color: red;
}

another-stylesheet.css

.error {
  color: red;
}

Button.js

import React, { Component } from 'react';
import styles from './Button.module.css'; // Import css modules stylesheet as styles
import './another-stylesheet.css'; // Import regular stylesheet

class Button extends Component {
  render() {
    // reference as a js object
    return <button className={styles.error}>Error Button</button>;
  }
}

Result

No clashes from other .error class names

<!-- This button has red background but not red text -->
<button class="Button_error_ax7yz"></div>

This is an optional feature. Regular <link> stylesheets and CSS files are fully supported. CSS Modules are turned on for files ending with the .module.css extension.

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