webpack.config.js

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

module.exports = {
  entry: {
    background: "./src/background.js",
    content: "./src/content.js",
  },
  mode: "production",
  module: {
    rules: [
      {
        test: /\.js$/,
        use: {
          loader: "babel-loader",
          options: {
            presets: ["@babel/preset-env"],
          },
        },
        exclude: /node_modules/,
      },
      {
        test: /\.css$/i,
        use: [MiniCssExtractPlugin.loader, "css-loader", "postcss-loader"],
        exclude: /node_modules/,
      },
    ],
  },
  plugins: [
    new MiniCssExtractPlugin({
      filename: "[name].css",
    }),
    new CopyPlugin({
      patterns: [
        { from: "manifest.json", to: "manifest.json" },
        { from: "src/content.css", to: "content.css" },
      ],
    }),
  ],
  output: {
    path: path.join(__dirname, "dist"),
    filename: "[name].js",
  },
};