webpack.config.js

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

module.exports = {
  mode: process.env.NODE_ENV || "production",
  entry: path.resolve(__dirname, "/client/index.js"),
  output: {
    path: path.resolve(__dirname, "dist"),
    filename: "bundle.js",
    publicPath: "/",
  },
  devtool: "source-map",
  devServer: {
    static: {
      directory: path.resolve(__dirname, "dist"),
    },
    port: 8080,
    hot: true,
    compress: true,
    historyApiFallback: true,
  },
  module: {
    rules: [
      {
        test: /\.jsx?/,
        exclude: /node_modules/,
        loader: "babel-loader",
        options: { presets: ["@babel/env", "@babel/preset-react"] },
      },
      {
        test: /.(css|scss)$/,
        exclude: /node_modules/,
        use: ["style-loader", "css-loader", "sass-loader"],
      },
    ],
  },
  plugins: [
    new HtmlWebpackPlugin({
      filename: "index.html",
      template: "./template.html",
    }),
    new Dotenv({
      systemvars: true,
    }),
  ],
};