webpack.config.js

const path = require("path");
const currentTask =  process.env.npm_lifecycle_event;
const MiniCssExtractPlugin = require('mini-css-extract-plugin')
const HtmlWebpackPlugin = require("html-webpack-plugin")
const {CleanWebpackPlugin} = require("clean-webpack-plugin")
const {WebpackManifestPlugin} = require("webpack-manifest-plugin")

const config = {
  entry: "./src/index.js",
  output: {
    filename: "bundle.[hash].js",
    path: path.resolve(__dirname, "dist"),
  },
  devServer: {
    port: 8080,
    static: {
      directory: path.resolve(__dirname, "dist"),
    },
    compress: true,
    hot: true,
  },
  plugins: [new HtmlWebpackPlugin({ template: "./src/index.html" })],
  module: {
    rules: [
      {
        test: /\.js$/,
        use: {
          loader: "babel-loader",
          options: {
            presets: ["@babel/preset-react"],
          },
        },
      },
      {
        test: /\.(scss|css)$/i,
        use: ["style-loader", "css-loader", "sass-loader"],
      },
      {
        test: /\.(png|svg|jpg|jpeg|gif)$/i,
        type: "asset/resource",
      },
    ],
  },
  mode: "development",
};

if(currentTask == "build"){
  config.mode = "production"
  config.module.rules[1].use[0] = MiniCssExtractPlugin.loader
  config.plugins.push(new MiniCssExtractPlugin({ filename: "main.[hash].css" }), new CleanWebpackPlugin(), new WebpackManifestPlugin({}))
}

module.exports = config