webpack.config.js

const path = require("path");
const webpack = require('webpack');
const HtmlWebpackPlugin = require("html-webpack-plugin");
const regeneratorRuntime = require("regenerator-runtime");

process.env.NODE_ENV = "development";

module.exports = {
  mode: "development",
  target: "web",
  // webpack will take the files from ./src/index
  entry: "./src/index",
  devtool: "cheap-module-source-map",

  entry: ['regenerator-runtime',"./src/index.tsx"],

  // and output it into /dist as bundle.js
  output: {
    path: path.join(__dirname, "/dist"),
    publicPath: "/",
    filename: "bundle.js",
  },
  devServer: {
    stats: "minimal",
    overlay: true,
    historyApiFallback: true,
    disableHostCheck: true,
    headers: { "Access-Control-Allow-Origin": "*" },
    https: false,
  },

  // adding .ts and .tsx to resolve.extensions will help babel look for .ts and .tsx files to transpile
  resolve: {
    extensions: [".ts", ".tsx", ".js",".jsx"],
  },

  module: {
    rules: [
      // we use babel-loader to load our jsx and tsx files
      {
        test: /\.(ts|js)x?$/,
        exclude: /node_modules/,
        use: {
          loader: "babel-loader",
        },
      },

      // css-loader to bundle all the css files into one file and style-loader to add all the styles  inside the style tag of the document
      {
        test: /\.css$/,
        use: ["style-loader", "css-loader"],
      },
    ],
  },
  plugins: [
    new webpack.DefinePlugin({
      "process.env.API_URL": JSON.stringify("http://localhost:3001")
    }),    
    new HtmlWebpackPlugin({
      template: "./src/index.html",
    }),
  ],
};