webpack.config.js

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

module.exports = {
  mode: "development",
  entry: "/src/index.js",

  output: {
    filename: "main.js",
    path: path.resolve(__dirname, "dist"),
  },

  target: "web",
  mode: process.env.NODE_ENV,
  devtool: "eval-source-map",

  devServer: {
    host: "localhost",
    port: 8080,
    hot: true,
    historyApiFallback: true,

    headers: { "Access-Control-Allow-Origin": "*" },
    proxy: {
      "/static/**": {
        target: "http://localhost:3000/",
      },
      "/login/**": {
        target: "http://localhost:3000/",
      },
      "/main/**": {
        target: "http://localhost:3000/",
      },
    },
  },

  resolve: {
    extensions: [".js", ".jsx", ".json"],
  },

  plugins: [
    new MiniCssExtractPlugin(),
    new HtmlWebpackPlugin({
      filename: "index.html",
      template: path.resolve(__dirname, "./src/index.html"),
    }),
  ],

  module: {
    rules: [
      {
        test: /\.jsx?/,
        exclude: /node_modules/,
        use: {
          loader: "babel-loader",
          options: {
            presets: ["@babel/preset-env", "@babel/preset-react"],
          },
        },
      },

      {
        test: /\.s[ac]ss$/i,
        exclude: /node_modules/,
        use: [MiniCssExtractPlugin.loader, "css-loader", "sass-loader"],
      },
    ],
  },
};