webpack.config.js

const path = require( 'path' );
const ExtractTextPlugin = require( 'extract-text-webpack-plugin' );
const buildSeparateFiles = require( './webpack.splitted' );
const RTL = require( 'webpack-rtl-plugin' );

/* #region include new plugin */
//const BundleAnalyzerPlugin = require( 'webpack-bundle-analyzer' ).BundleAnalyzerPlugin;
/* #endregion */

// Set different CSS extraction for editor only and common block styles
const blocksCSSPlugin = new ExtractTextPlugin( {
	filename: './assets/css/blocks.style.css'
} );
const editBlocksCSSPlugin = new ExtractTextPlugin( {
	filename: './assets/css/blocks.editor.css'
} );

const rtlStylesPlugin = new RTL( {
	minify: 'production' === process.env.NODE_ENV,
	plugins: [
		{
			'name': 'disable processors',
			'priority': 50,
			'directives': {
				'control': {},
				'value': []
			},
			'processors': [
				{
					'name': 'ignore all',
					'expr': /./im,
					'action': function (prop, value) {
						return { 'prop': prop, 'value': value }
					}
				}
			]
		}
	],
} );

/* #region Webpack Bundle Analyzer */
/*const bundleAnalyzerPlugin = new BundleAnalyzerPlugin( {
	analyzerMode: 'disabled',
	generateStatsFile: true,
	statsOptions: { source: false }
} );*/
/* #endregion */

// Configuration for the ExtractTextPlugin.
const extractConfig = {
	use: [
		{
			loader: 'raw-loader'
		},
		{
			loader: 'postcss-loader',
			options: {
				plugins: [ require( 'autoprefixer' ) ]
			}
		},
		{
			loader: 'sass-loader',
			query: {
				outputStyle: 'expanded'
			}
		}
	]
};

const defaultConfig = {
	entry: {
		'./assets/js/editor.blocks'  : './src/index.js',
		'./assets/js/frontend.blocks': './src/frontend.js'
	},
	output: {
		path: path.resolve(__dirname),
		filename: '[name].js',
		library: [ 'wp', '[name]' ],
		libraryTarget: 'window',
	},
	devtool: 'production' !== process.env.NODE_ENV ? 'cheap-eval-source-map' : false,
	watch  : 'production' !== process.env.NODE_ENV,
	stats: { children: false },
	module: {
		rules: [
			{
				test: /\.js$/,
				exclude: /node_modules/,
				use: {
					loader: 'babel-loader'
				}
			},
			{
				test: /style\.s?css$/,
				use: blocksCSSPlugin.extract( extractConfig )
			},
			{
				test: /editor\.s?css$/,
				use: editBlocksCSSPlugin.extract( extractConfig )
			}
		]
	},
	externals: {
		'react': 'React',
		'react-dom': 'ReactDOM',
		'lodash': 'lodash',
		//https://www.cssigniter.com/importing-gutenberg-core-wordpress-libraries-es-modules-blocks/
		'wp.i18n': {
			window: [ 'wp', 'i18n' ]
		},
	},
	resolve: {
		alias: {
			GetwidControls: path.resolve( __dirname, 'src/controls/' ),
			GetwidUtils   : path.resolve( __dirname, 'src/utils/'    ),
			GetwidVendor  : path.resolve( __dirname, 'vendors/'      )
		}
	},
	plugins: [
		blocksCSSPlugin,
		editBlocksCSSPlugin,
		rtlStylesPlugin,
		//bundleAnalyzerPlugin
	]
};

module.exports = (env) => {
	if (env && env.splitted) {
		return buildSeparateFiles;
	}

	return defaultConfig;
};