css-to-mui-loader

Webpack loader for using external CSS files with Material UI.

Install | Usage | Description | Features | Demo | Linting | Help out

Install

npm install css-to-mui-loader

Dependency version support:

material-ui

• [email protected] and up supports material-ui v4
• [email protected] and down supports material-ui v3

jss

• [email protected] and up supports jss v10
• [email protected] and down supports jss v9

Usage

styles.css

.button {
  background: $(theme.palette.primary.main);
  padding: 2su; /* Material UI spacing units */
}

.button:hover {
  background: $(theme.palette.primary.light);
}

MyComponent.js

import Button from '@material-ui/core/Button';
import { withStyles } from '@material-ui/core/styles';
import styles from './styles.css';

const MyComponent = withStyles(styles)(({ classes }) => (
  <Button className={classes.button}>
    Click Me
  </Button>
));

webpack.config.js

module.exports = {
  module: {
    rules: [
      {
        test: /\.css$/,
        use: [ 'css-to-mui-loader' ]
      }
    ]
  }
}

Description

The css-to-mui-loader allows you to write external CSS files then import them for use in your Material UI components. It provides shortcuts for accessing the Material UI theme within the CSS itself.

Why?

1. CSS is more concise
2. Designers don't want to write JS
3. You can copy/paste CSS directly from Chrome Inspector
4. You still get component-scoped CSS and a centralized theme

Features

Provides custom unit for Material UI spacing

.spacing {
  padding: 10su; /* Equal to theme.spacing.unit * 10 */
}

Provides access to the Material UI theme

.theme {
  color: $(theme.palette.primary.main);
  z-index: $(theme.zIndex.appBar);
}

Supports media queries using the Material UI theme breakpoints

@media $(theme.breakpoints.down('sm')) {
  .media {
    display: none;
  }
}

Allows Material UI theme objects to be included as mixins

.mixins {
  -mui-mixins: theme.typography.display4, theme.shape;
}

Supports classes, child selectors and pseudo-classes

.parent.qualifier .child:hover * {
  padding: 10px;
}

Supports CSS variables

:root {
  --small-spacing: 2su;
}

.variables {
  margin: var(--small-spacing);
}

Supports keyframes

@keyframes my-animation {
  0% { opacity: 0; }
  100% { opacity: 1; }
}

.keyframes {
  animation: my-animation 1s ease-in-out;
}

If you want to know what the loader output looks like, take a look at the tests.

Demo

Check out the css-to-mui-loader-example repository for a bare-bones demo bootstrapped with create-react-app.

Linting

Some linters might complain about the custom syntax, but there are usually rules you can enable to address this. For example, the following .stylelintrc for stylelint does not raise any errors with the custom css-to-mui-loader syntax:

{
  "extends": "stylelint-config-standard",
  "plugins": [
    "stylelint-order"
  ],
  "rules": {
    "function-name-case": null,
    "property-no-unknown": [
      true,
      {
        "ignoreProperties": ["-mui-mixins"]
      }
    ],
    "unit-no-unknown": [
      true,
      {
        "ignoreUnits": ["/^su$/"]
      }
    ]
  }
}

Help out

Pull requests, issues, complaints and suggestions are all welcome.