babel-plugin-react-scoped-css
CSS encapsulation solution for React
Last updated 5 months ago by gaoxiaoliangz .
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React scoped CSS

CSS encapsulation solution for React

Why

In order to solve the problem of css encapsulation, there are two main approaches, css-modules and css-in-js. However, both of them have a very very big problem. The developer experience is not good, by which I mean you often have to write more code than you expect to achieve a simple style. With react-scoped-css, you can just write the normal css you know, while having the advantage of css encapsulation!

How to use

You have to add one babel plugin and one webpack loader.

the babel plugin

yarn add babel-plugin-react-scoped-css --dev

and in your babelrc add

"plugins": ["babel-plugin-react-scoped-css"]

If you have other plugins installed, just add it to the list, order doesn't matter.

Note: this plugin accepts include(RegExp, which defaults to /\.scoped\.(s)?css$/) to config which css file to be identified as scoped.

the webpack loader

yarn add scoped-css-loader --dev

and in your webpack.config.js

{
  test: /\.(s)?css$/,
  use: [
    {
      loader: 'style-loader',
    },
    {
      loader: 'css-loader',
      options: {
        sourceMap: true,
        importLoaders: 2,
      },
    },
    // You have to put in after `css-loader` and before any `pre-precessing loader`
    { loader: 'scoped-css-loader' },
    {
      loader: 'sass-loader',
    },
  ],
},

That's it for the configuration.

Example

/* Title.scoped.css */
.title {
  background: #999;
}

p {
  color: #ddd;
}
// Title.jsx
import React from 'react'
import './Title.scoped.css'

const Title = props => {
  return (
    <h1 className="title">
      <p>{props.children}</p>
    </h1>
  )
}

export default Title

Then, in the html, component with scoped css file imported has a unique data-v-<hash> attribute on the html element tag, and the css selector also has a corresponding hash like selector[data-v-<hash>].

Some common use cases with react scoped css

Check out simple-scoped-css-example

Use scoped css in create react app

Due to the fact that create react app doesn't allow user to modify the config of webpack or babel, I created my own fork of a configurable version of it. You can find it here.

Use in a new create-react-app project

create-react-app app_name --scripts-version=@gxl/react-scripts

and you are good to go, react scoped css is supported by default

Use in an existing create-react-app project (which hasn't been ejected yet)

npm install @gxl/react-scripts --save-dev
npm remove react-scripts

and next time you start your project you're bootstrapping from @gxl/react-scripts

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