webpack.config.js

const path = require('path');

const HtmlWebpackPlugin = require('html-webpack-plugin');

const paths = {
    DIST: path.resolve(__dirname, 'dist'),
    SRC: path.resolve(__dirname, 'src'),
};

module.exports = {
    mode: 'development',
    entry: path.join(paths.SRC, 'index.js'),
    output: {
        path: paths.DIST,
        filename: 'app.bundle.js',
    },
    devtool: 'inline-source-map',
    devServer: {
        open: true,
        contentBase: './dist',
    },
    module: {
        rules: [
            {
                test: /\.html$/i,
                loader: 'html-loader',
            },
            {
                test: /\.(js|jsx)$/,
                exclude: /node_modules/,
                use: [
                    'babel-loader',
                ],
            },
            {
                test: /\.s[ac]ss$/i,
                use: [
                    'style-loader',
                    'css-loader',
                    'sass-loader',
                ]
            }
        ],
    },
    plugins: [
        new HtmlWebpackPlugin({
            template: path.join(paths.SRC, 'index.html'),
        })
    ],
    resolve: {
        extensions: ['.js', '.jsx'],
    }
};