Enable SASS or LESS support | Magento PWA Documentation

This tutorial provides the steps to enable SASS or LESS support in your storefront project.

Use these Webpack configurations to add support for SASS and LESS alongside CSS Modules.

Add SASS support

Step 1. Install dependencies

Use a package manager, such as yarn or npm, to install the SASS loader as a dev dependency.

yarn add --dev sass-loader node-sass

Step 2. Modify the Webpack configuration

Edit webpack.config.js and add a new config rule entry:

    config.plugins = [
        ...config.plugins,
        new DefinePlugin({
            /**
             * Make sure to add the same constants to
             * the globals object in jest.config.js.
             */
            UNION_AND_INTERFACE_TYPES: JSON.stringify(unionAndInterfaceTypes),
            STORE_NAME: JSON.stringify('Venia')
        }),
        new HTMLWebpackPlugin({
            filename: 'index.html',
            template: './template.html',
            minify: {
                collapseWhitespace: true,
                removeComments: true
            }
        })
    ];
+
+   config.module.rules.push({
+       test: /\.s[ca]ss$/,
+       use: [
+           'style-loader',
+           {
+               loader: 'css-loader',
+               options: {
+                   modules: true,
+                   sourceMap: true,
+                   localIdentName: '[name]-[local]-[hash:base64:3]'
+               }
+           },
+           'sass-loader'
+       ]
+   });

Step 3. Create a SASS file and import it in a component

Create the myComponent.scss file:

$button-color: #ff495b;
$button-color-hover: #ff9c1a;

.root {
    padding: 15px;
}

.button {
    color: $button-color;

    &:hover {
        color: $button-color-hover;
    }
}

Create a component and import the SASS file:

import React from 'react';
import defaultClasses from './myComponent.scss';

const MyComponent = () => (
    <div className={defaultClasses.root}>
        <button className={defaultClasses.button}>My Component</button>
    </div>
);

export default MyComponent;

Add LESS support

Step 1. Install dependencies

Use a package manager, such as yarn or npm, to install the LESS loader as a dev dependency.

yarn add --dev less-loader less

Step 2. Modify the Webpack configuration

Edit webpack.config.js and add a new config rule entry:

    config.plugins = [
        ...config.plugins,
        new DefinePlugin({
            /**
             * Make sure to add the same constants to
             * the globals object in jest.config.js.
             */
            UNION_AND_INTERFACE_TYPES: JSON.stringify(unionAndInterfaceTypes),
            STORE_NAME: JSON.stringify('Venia')
        }),
        new HTMLWebpackPlugin({
            filename: 'index.html',
            template: './template.html',
            minify: {
                collapseWhitespace: true,
                removeComments: true
            }
        })
    ];
+
+   config.module.rules.push({
+       test: /\.less$/,
+       use: [
+           'style-loader',
+           {
+               loader: 'css-loader',
+               options: {
+                   modules: true,
+                   sourceMap: true,
+                   localIdentName: '[name]-[local]-[hash:base64:3]'
+               }
+           },
+           'less-loader'
+       ]
+   });

Step 3. Create a LESS file and import it on your component

Create the myComponent.less file:

@button-color: #ff495b;
@button-color-hover: #ff9c1a;

.root {
    padding: 15px;
}

.button {
    color: @button-color;

    &:hover {
        color: @button-color-hover;
    }
}

Create a component and import the LESS file:

import React from 'react';
import defaultClasses from './myComponent.less';

const MyComponent = () => (
    <div className={defaultClasses.root}>
        <button className={defaultClasses.button}>My Component</button>
    </div>
);

export default MyComponent;