React Material-UI

Configuring React, Material-UI and Sass

React Material-UI

by John Vincent

Posted on May 27, 2018

This article describes how to configure React with Material-UI and Sass.




I am working with the next version of Material-UI

Install Material-UI

npm install --save material-ui@next
npm install --save material-ui-icons@next

or, more specifically

npm install --save material-ui@1.0.0-beta.37
npm install --save material-ui-icons@1.0.0-beta.36

Material-UI encourages the use of some non-standard language features. Install these

npm install babel-plugin-transform-class-properties --save-dev
npm install babel-plugin-transform-object-rest-spread --save-dev

Update .babelrc

"presets": ["env", "react"],
"plugins": ["transform-object-rest-spread", "transform-class-properties"]

Update .eslintrc

    "extends": ["airbnb", "prettier"],
    "env": {
        "browser": true
    "parser": "babel-eslint",
    "globals": {},
    "rules": {
        "no-console": 0,
        "max-len": [
                "code": 100,
                "tabWidth": 2,
                "comments": 100,
                "ignoreTrailingComments": true,
                "ignoreUrls": true,
                "ignorePattern": "^import\\s.+\\sfrom\\s.+;$"
        "indent": [2, "tab", { "SwitchCase": 1 }],
        "no-tabs": 0,
        "react/jsx-indent": ["off", 2],
        "react/jsx-indent-props": ["off", 2],
        "jsx-a11y/anchor-is-valid": [
                "components": ["Link"],
                "specialLink": ["to"]
    "plugins": ["react", "jsx-a11y", "import"]

The advanced language features required the use of the babel-eslint parser.

npm install babel-eslint --save-dev

Update webpack.config.js

const webpack = require('webpack');
const path = require('path');

const APP_FOLDER = path.resolve(__dirname, './src');
const SCSS_FOLDER = path.resolve(__dirname, './scss');
const ASSETS_FOLDER = path.resolve(__dirname, './src/assets');
const DIST_FOLDER = path.resolve(APP_FOLDER, './dist');
// const DIST_FOLDER_STYLE = path.resolve(DIST_FOLDER, './css');

const INCLUDE_SCSS_FOLDER = path.resolve(__dirname, './src');

const CopyWebpackPlugin = require('copy-webpack-plugin');

const ExtractTextPlugin = require('extract-text-webpack-plugin');

const extractSCSSBundle = new ExtractTextPlugin({
    filename: '[name].bundle.css',
    allChunks: true

require('dotenv').config(); // load from .env file

const config = {
    // entry: ['./src/index.jsx', './src/scss/index.scss', './src/components/main.scss'],
    entry: ['./src/index.jsx', './scss/index.scss'],

    output: {
        path: DIST_FOLDER,
        filename: 'bundle.js'

    devtool: 'inline-source-map', // development
    // devtool: 'eval-source-map',      // development
    //  devtool: 'source-map',  // production
    devServer: {
        contentBase: DIST_FOLDER,
        compress: false, // true
        // inline: true,
        port: 8045,
        clientLogLevel: 'info',
        proxy: {
            '/api/**': { target: 'http://localhost:3001', changeOrigin: true, secure: false }

    module: {
        rules: [
                test: /\.js$/,
                exclude: /node_modules/,
                loader: 'babel-loader'
                test: /\.jsx$/,
                exclude: /node_modules/,
                loader: 'babel-loader'
            // {
            //  // regular css files
            //  test: /\.css$/,
            //  loader: extractCSS.extract({
            //      fallback: 'style-loader/url!file-loader',
            //      use: ['css-loader'],
            //      publicPath: DIST_FOLDER_STYLE
            //  })
            // },

                test: /\.(sass|scss)$/,
                include: INCLUDE_SCSS_FOLDER,
                exclude: [SCSS_FOLDER, /node_modules/],
                use: ['style-loader', 'css-loader', 'sass-loader']

                test: /\.(sass|scss)$/,
                include: SCSS_FOLDER,
                exclude: [INCLUDE_SCSS_FOLDER, /node_modules/],
                loader: extractSCSSBundle.extract(['css-loader', 'sass-loader'])
                test: /\.(png|jpg|jpeg|gif|ttf|eot|svg|woff(2)?)(\?[a-z0-9=&.]+)?$/,
                include: ASSETS_FOLDER,
                loader: 'file-loader?name=assets/[name].[ext]'
    resolve: {
        extensions: ['.js', '.jsx']
    plugins: [
        new webpack.EnvironmentPlugin(['NODE_ENV', 'API_KEY']),
        new CopyWebpackPlugin([{ from: 'index.html', to: '.' }], { debug: 'info' })

module.exports = config;

Notice there are 2 Sass sections.

  • The Sass code that is to bundled into styles.css is in ./scss. This code is compiled, loaded and bundled using extractSCSSBundle
  • The Sass code that is to be injected as styles into a React component is in the ./src folder. The Sass code is expected to be alongside the component that imports it. This code is compiled, loaded and injected with style-loader into the JavaScript.

Basic Configuration

The usual entry point, index.jsx

import React from 'react';
import ReactDOM from 'react-dom';

import { HashRouter as Router } from 'react-router-dom';

import { MuiThemeProvider } from 'material-ui/styles';

import { baseTheme } from './themes/theme';

import configureStore from './store/configureStore';
import Root from './containers/Root';

const store = configureStore();

document.addEventListener('DOMContentLoaded', () => {
        <MuiThemeProvider theme={baseTheme}>
                <Root store={store} />

Uses baseTheme

import { createMuiTheme } from 'material-ui/styles';

import purple from 'material-ui/colors/purple';
import blue from 'material-ui/colors/blue';
import cyan from 'material-ui/colors/cyan';

export const baseTheme = createMuiTheme({
    palette: {
        primary: { main: blue[500] },
        secondary: { main: cyan[500] }
    typography: {

Sass Injection

Component Scss

import React from 'react';
import MuiThemeProvider from 'material-ui/styles/MuiThemeProvider';
import { createMuiTheme } from 'material-ui/styles';
import Button from 'material-ui/Button';

import './scss.scss';

const theme = createMuiTheme({
    palette: {
        primary: {
            light: '#757ce8',
            main: '#3f50b5',
            dark: '#002884',
            contrastText: '#fff'
        secondary: {
            light: '#ff7961',
            main: '#f44336',
            dark: '#ba000d',
            contrastText: '#000'

const Scss = () => (
    <MuiThemeProvider theme={theme}>
        <Button color="primary">Primary Button</Button>
        <Button color="secondary">Secondary Button</Button>
        <br />
        <Button classes={ { root: 'main' } }>button, classes root: main, injected</Button>
        <Button classes={ { root: 'jv2' } }>button, classes root: jv2, injected</Button>
        <div className="alphabetagamma">div, class alphabetagamma, from bundle</div>
        <div className="delta">div, class delta, from bundle</div>
        <div className="main">div, class main, injected</div>

export default Scss;

The Sass to inject, ./scss.scss

.main {
  background-color: red !important;
  width: 150px;
  height: 160px;

.jv2 {
  background-color: brown !important;
  width: 250px;
  height: 260px;

Notice the use of !important to override the Material-UI choice of color.

Breaking this down.

<MuiThemeProvider theme={theme}>

loaded the theme.

<Button color="primary">Primary Button</Button>
<Button color="secondary">Secondary Button</Button>

use this theme.

<Button classes={ { root: 'main' } }>button, classes root: main, injected</Button>
<Button classes={ { root: 'jv2' } }>button, classes root: jv2, injected</Button>

instructs the Material-UI Button component to use classes defined in scss.scss

<div className="main">div, class main, injected</div>

instructs the div to use class "main", which is defined in scss.scss

<div className="alphabetagamma">div, class alphabetagamma, from bundle</div>
<div className="delta">div, class delta, from bundle</div>

refer to classes that are defined in the scss bundle, for example


@import 'test';


.alphabetagamma {
  width: 300px;
  height: 300px;
  background-color: green;

.delta {
  width: 200px;
  height: 200px;
  background-color: yellow;