webpack.dev.js

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

module.exports = {
    mode: 'development',
    entry: './src/index.js',
    devServer: {
        static: './dist'
    },
    devtool: 'inline-source-map',
    module: {
        rules: [
            {
                test: /\.m?js$/,
                exclude: /node_modules/,
                use: {
                    loader: "babel-loader",
                    options: {
                        presets: ['@babel/preset-env']
                    }
                }
            }, {
                test: /\.s[ac]ss$/i,
                use: [
                    { loader: 'css-loader', options: { sourceMap: true } },
                    { loader: 'postcss-loader', options: { sourceMap: true } },
                    { loader: 'sass-loader', options: { sourceMap: true } },
                ],
            },
        ]
    },
    plugins: [
        new HtmlWebpackPlugin({
            title: 'Development',
        }),
    ],
    output: {
        filename: 'bundle.js',
        path: path.resolve(__dirname, 'dist'),
    },
};