webpack.config.dev.js

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

process.env.NODE_ENV = "development";

module.exports = {
  mode: "development",
  target: "web",
  devtool: "cheap-module-source-map",
  entry: "./src/index",
  output: {
    path: path.resolve(__dirname, "build"),
    publicPath: "/",
    filename: "bundle.js"
  },
  devServer: {
    stats: "minimal",
    overlay: true,
    historyApiFallback: true,
    disableHostCheck: true,
    headers: { "Access-Control-Allow-Origin": "*" },
    https: false
  },
  plugins: [
    new Dotenv({
      path: "./.env.development", // Path to .env file (this is the default)
      safe: true // load .env.example (defaults to "false" which does not use dotenv-safe)
    }),
    new HtmlWebpackPlugin({
      template: path.resolve(__dirname, "public", "index.html"),
      favicon: path.resolve(__dirname, "public", "favicon.ico")
    })
  ],
  module: {
    rules: [
      {
        test: /\.(js|jsx)$/,
        exclude: /node_modules/,
        use: ["babel-loader", "eslint-loader"]
      },
      {
        test: /\.tsx?$/,
        use: 'ts-loader',
        exclude: /node_modules/,
      },
      {
        test: /\.s[ac]ss$/i,
        use: [
          // Creates `style` nodes from JS strings
          "style-loader",
          // Translates CSS into CommonJS
          "css-loader",
          // Compiles Sass to CSS
          "sass-loader"
        ]
      }
    ]
  },
  resolve: {
    extensions: ['.tsx', '.ts', '.js'],
  },
};