webpack.config.js

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const CopyPlugin = require('copy-webpack-plugin');
const {CleanWebpackPlugin} = require('clean-webpack-plugin');

const devMode = process.env.NODE_ENV !== 'production';

module.exports = {
	entry: './src/index.js',
	output: {
		path: path.resolve(__dirname, 'dist'),
		filename: 'bundle.js',
	},
	module: {
		rules: [
			{
				test: /\.s?[ac]ss$/,
				use: [
					MiniCssExtractPlugin.loader,
					{loader: 'css-loader', options: {url: false, sourceMap: true}},
					{loader: 'sass-loader', options: {sourceMap: true}},
				],
			},
			{
				enforce: 'pre',
				test: /\.js$/,
				exclude: /node_modules/,
				loader: 'eslint-loader',
			},
			{
				test: /\.js$/,
				exclude: /node_modules/,
				loader: 'babel-loader',
			},
		],
	},
	plugins: [
		new CleanWebpackPlugin({
			cleanStaleWebpackAssets: !devMode,
		}),
		new HtmlWebpackPlugin({
			filename: 'index.html',
			template: './src/index.html',
		}),
		new MiniCssExtractPlugin({
			filename: 'style.css',
		}),
		new CopyPlugin({
			patterns: [
				{from: 'src/public', to: ''},
			],
		}),
	],
	mode: devMode ? 'development' : 'production',
	watch: devMode,
};