webpack.config.js

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');

const isDevelopmentMode = process.env.WEBPACK_DEV_SERVER;

module.exports = {
    mode: isDevelopmentMode ? 'development' : 'production',
    entry: './src/index.tsx',
    output: {
        path: path.resolve(__dirname, 'dist'),
        filename: 'bundle.js'
    },

    devtool: isDevelopmentMode ? false : 'source-map',

    resolve: {
        extensions: ['.ts', '.tsx', '.js']
    },

    module: {
        rules: [
            {
                test: /\.tsx?$/,
                exclude: /node_modules/,
                use: {
                    loader: 'babel-loader',
                    options: {
                        presets: ['@babel/preset-env', '@babel/preset-react', '@babel/preset-typescript']
                    }
                }
            },
            {
                test: /\.(css|scss)$/,
                use: [MiniCssExtractPlugin.loader, 'css-loader', 'sass-loader']
            }
        ]
    },

    plugins: [
        new HtmlWebpackPlugin({
            template: './src/index.html'
        }),
        new MiniCssExtractPlugin()
    ],

    devServer: {
        contentBase: path.join(__dirname, 'dist'),
        compress: true,
        port: 3000
    }
};