webpack.config.js

const path = require("path");
const HtmlWebpackPlugin = require("html-webpack-plugin");
const CopyPlugin = require("copy-webpack-plugin");

module.exports = {
  mode: "production",
  entry: {
    index: "./src/index.js",
  },
  output: {
    path: path.resolve(__dirname, "dist"),
    filename: "background.bundle.js",
  },
  resolve: {
    extensions: [".js", ".jsx"],
  },
  module: {
    rules: [
      {
        test: /\.js$|jsx/,
        exclude: /node_modules/,
        use: {
          loader: "babel-loader",
          options: {
            presets: ["@babel/preset-env", "@babel/preset-react"],
          },
        },
      },
      {
        test: /\.css$/i,
        use: ["style-loader", "css-loader"]
      },
    ],
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: "./public/index.html",
      filename: "index.html",
    }),
    new CopyPlugin({
      patterns: [{ from: "./public/favicon", to: "favicon" }],
    }),
    new CopyPlugin({
      patterns: [{ from: "./public/manifest.json" }],
    })
  ],
};