webpack.config.js

const { CleanWebpackPlugin } = require("clean-webpack-plugin");
const CopyWebpackPlugin = require("copy-webpack-plugin");
const HtmlWebpackPlugin = require("html-webpack-plugin");
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const sveltePreprocess = require("svelte-preprocess");
const path = require("path");

const mode = process.env.NODE_ENV || "development";
const prod = mode === "production";

let options = {
  context: path.resolve(__dirname, "./src"),
  entry: {
    popup: "./popup/index.js",
    options: "./options/index.js",
    background: "./background/index.js",
    "content-scripts": "./content-scripts/index.js",
    "content-test": "./content-test/index.js",
  },
  output: {
    path: path.join(__dirname, "/dist"),
    publicPath: "./",
    filename: "[name].js",
  },
  module: {
    rules: [
      {
        test: /\.svelte$/,
        use: {
          loader: "svelte-loader",
          options: {
            compilerOptions: {
              dev: !prod,
            },
            emitCss: prod,
            hotReload: !prod,
            preprocess: sveltePreprocess({
              postcss: true,
            }),
          },
        },
      },
      {
        test: /\.css$/,
        use: [MiniCssExtractPlugin.loader, "css-loader", "postcss-loader"],
      },
      {
        // required to prevent errors from Svelte on Webpack 5+
        test: /node_modules\/svelte\/.*\.mjs$/,
        resolve: {
          fullySpecified: false,
        },
      },
    ],
  },
  resolve: {
    alias: {
      svelte: path.dirname(require.resolve("svelte/package.json")),
    },
    extensions: [".mjs", ".js", ".svelte"],
    mainFields: ["svelte", "browser", "module", "main"],
  },
  plugins: [
    new CleanWebpackPlugin({
      cleanStaleWebpackAssets: false,
    }),
    new MiniCssExtractPlugin({
      filename: "[name].css",
    }),
    new CopyWebpackPlugin({
      patterns: [
        { from: "assets", to: "assets" },
        { from: "manifest.json", to: "manifest.json" },
      ],
    }),
    new HtmlWebpackPlugin({
      template: "./index.html",
      filename: "popup.html",
      chunks: ["popup"],
    }),
    new HtmlWebpackPlugin({
      template: "./index.html",
      filename: "options.html",
      chunks: ["options"],
    }),
  ],
  mode,
  devtool: prod ? false : "source-map",
  devServer: {
    static: {
      directory: path.join(__dirname, "dist"),
    },
    hot: true,
  },
};

module.exports = options;