Scoped Styles for React

Get your CSS classes scoped by component directory

How it's different from CSS Modules?

In CSS Modules you have to manually import and assign classes

import styles from './button.styl';

const Button = () => (
  <button className={styles.foo}>Press Me</button>
);

React Scoped Styles doesn't require to change the conventional styling workflow. You still assign your classes with plain strings.

import './button.styl';

const Button = () => (
  <button className="foo">Press Me</button>
);

Installation

npm i react-scoped-styles

Usage

The module assumes that component file and its styles are in the same directory. This is sample for Stylus. The same applies for Sass and others.

+-- button
   +-- Button.tsx
   +-- button.styl

Button.tsx

  import React from 'react';
  import './button.styl';

  const Button = () => (
    <button className="foo">Press Me</button>
  );

  export default Button;

button.styl

.foo
    border none
    padding 10px 30px
    color white
    background-color darkslateblue

This will be rendered to

<button class="button-c65bae6565-foo">Press Me</button>

.button-c65bae6565-foo {
  border: none;
  padding: 10px 30px;
  color: #fff;
  background-color: #483d8b;
}

Getting started

The module exposes two loaders both for componenets and styles.
Append the script-loader after it has been transpiled by TypeScript or Babel.
And style-loader should be after the preprocessor loader and before the css-loader.

webpack.config.js

module.exports = {
  module: {
    rules: [
      // TypeScript
      {
        test: /\.tsx?$/,
        use: [
          'react-scoped-styles/script-loader',
          'awesome-typescript-loader'
        ]
      },
      // Babel
      {
        test: /\.jsx?$/,
        exclude: /node_modules/,
        use: [
          'react-scoped-styles/script-loader',
          {
            loader: 'babel-loader',
            options: {
              presets: ['@babel/preset-env', '@babel/preset-react']
            }
          }
        ]
      },
      // Stylus
      {
        test: /\.styl$/,
        use: [
          'style-loader',
          'css-loader',
          'react-scoped-styles/style-loader',
          'stylus-loader'
        ]
      },
      // Sass
      {
        test: /\.scss$/,
        use: [
          'style-loader',
          'css-loader',
          'react-scoped-styles/style-loader',
          'sass-loader'
        ]
      }
    ]
  }
};

Globals

To use global styles you can pass globalsPrefix options to both loaders and prefix your classes with it.
(app is applied by default)

const scopedStylesOptions = {
  globalsPrefix: 'app'
};


{
  loader: 'react-scoped-styles/script-loader',
  options: scopedStylesOptions
}
// ...
{
  loader: 'react-scoped-styles/style-loader',
  options: scopedStylesOptions
}

Thus classes with app- prefix will be ignored.

const Button = () => (
    <button className="foo app-global-class">Press Me</button>
);

.foo
    border none
    padding 10px 30px
    color white
    background-color darkslateblue

.app-global-class
    background-color purple

Becomes

<button class="button-c65bae6565-foo app-global-class">Press Me</button>

.button-c65bae6565-foo {
  border: none;
  padding: 10px 30px;
  color: #fff;
  background-color: #483d8b;
}
.app-global-class {
  background-color: #800080;
}

Conditional classes

To use conditional classnames you can use the classes function.
Note that the classnames should be inline

import React, { useState } from 'react';
import { classes } from 'react-scoped-styles';
import './sidebar.styl';

export const SideBar = () => {
    const [open, setOpen] = useState(false);

    return (
        <div className={classes([open, 'open'], 'sidebar')}>
            ...
        </div>
    )
};

API

classes (
    ...([boolean, string] | string)[]
) => string;

classes function accepts arrays of [condition, className] pairs, and class-name strings or default classes.

<div className={classes('default', [true, 'applied'], 'another-one', [false, 'not-applied'])} />

All classes should be INLINE, this won't work

const someClass = 'some';
const someCondition = true;

<div className={classes([someCondition, someClass])} />