webpack.config.js

const path = require('path');
const CopyPlugin = require('copy-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');

module.exports = {
    entry: './src/index.js',
    output: {
        path: path.resolve(__dirname, 'dist'),
        publicPath: '',
        filename: 'js/index.bundle.js',
    },
    devtool: false,
    module: {
        rules: [
            {
                test: /\.js$/,
                exclude: /node_modules/,
                use: {
                    loader: 'babel-loader',
                    options: {
                        presets: ['@babel/preset-react']
                    }
                }
            },
            {
                test: /\.(sa|sc|c)ss$/,
                use: [
                    {
                        loader: MiniCssExtractPlugin.loader
                    },
                    {
                        loader: 'css-loader'
                    },
                    {
                        loader: 'sass-loader',
                        options: {
                            implementation: require('sass')
                        }
                    }
                ]
            }
        ]
    },
    plugins: [
        new CopyPlugin({
            patterns: [
                {
                    from: 'src/index.html',
                    to: '',
                    context: ''
                }
            ],
        }),
        new MiniCssExtractPlugin({
            filename: 'css/index.css'
        })
    ]
}