webpack.config.js

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

module.exports = {
  mode: "development",
  entry: {
    app: ["./src", "webpack-hot-middleware/client"],
    vendor: ["react", "react-dom"]
  },
  output: {
    path: path.resolve(__dirname, "dist"),
    filename: "js/[name].bundle.js"
  },
  devtool: "source-map",
  resolve: {
    extensions: [".ts", ".tsx", ".js", ".json"]
  },
  module: {
    rules: [
      {
        test: /\.(ts|tsx)$/,
        loader: "ts-loader",
        exclude: /node_modules/
      },
      { enforce: "pre", test: /\.js$/, loader: "source-map-loader" }
    ]
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: path.resolve(__dirname, "index.html")
    }),
    new webpack.HotModuleReplacementPlugin()
  ]
};