webpack.config.js

var webpack = require("webpack"),
    path = require("path"),
    fileSystem = require("fs"),
    env = require("./utils/env"),
    CleanWebpackPlugin  = require("clean-webpack-plugin"),
    CopyWebpackPlugin = require("copy-webpack-plugin"),
    HtmlWebpackPlugin = require("html-webpack-plugin"),
    WriteFilePlugin = require("write-file-webpack-plugin");

// load the secrets
var alias = {
  svelte: path.resolve('node_modules', 'svelte')
};

var secretsPath = path.join(__dirname, ("secrets." + env.NODE_ENV + ".js"));

var fileExtensions = ["jpg", "jpeg", "png", "gif", "eot", "otf", "svg", "ttf", "woff", "woff2"];

if (fileSystem.existsSync(secretsPath)) {
  alias["secrets"] = secretsPath;
}

var options = {
  mode: process.env.NODE_ENV || "development",
  entry: {
    popup: path.join(__dirname, "src", "js", "popup.js"),
    background: path.join(__dirname, "src", "js", "background.js"),
  },
  chromeExtensionBoilerplate: {
    notHotReload: []
  },
  output: {
    path: path.join(__dirname, "build"),
    filename: "[name].bundle.js"
  },
  module: {
    rules: [
      {
        test: /\.css$/,
        loader: "style-loader!css-loader",
        exclude: /node_modules/
      },
      {
        test: new RegExp('\.(' + fileExtensions.join('|') + ')$'),
        loader: "file-loader?name=[name].[ext]",
        exclude: /node_modules/
      },
      {
        test: /\.svelte$/,
        exclude: /node_modules/,
        use: 'svelte-loader'
      }
    ]
  },
  resolve: {
    alias: alias,
    extensions: ['.mjs', '.js', '.svelte'],
    mainFields: ['svelte', 'browser', 'module', 'main']
  },
  plugins: [
    // clean the build folder
    new CleanWebpackPlugin(['build']),
    // expose and write the allowed env vars on the compiled bundle
    new webpack.EnvironmentPlugin(["NODE_ENV"]),
    new CopyWebpackPlugin([
      "src/img",
      {
        from: "src/manifest.json",
        transform: function (content, path) {
          const manifest = {
            description: process.env.npm_package_description,
            version: process.env.npm_package_version,
            ...JSON.parse(content.toString())
          };

          if (env.NODE_ENV === "production") {
            delete manifest.content_security_policy;
          }

          // generates the manifest file using the package.json informations
          return Buffer.from(JSON.stringify(manifest))
        }
      }
    ]),
    new HtmlWebpackPlugin({
      template: 'src/popup.html',
      filename: 'popup.html',
      chunks: ['popup'],
    }),
    // new HtmlWebpackPlugin({
      // template: path.join(__dirname, "src", "popup.html"),
      // filename: "popup.html",
      // chunks: ["popup"]
    // }),
    new WriteFilePlugin()
  ]
};

if (env.NODE_ENV === "development") {
  options.devtool = "cheap-module-eval-source-map";
}

module.exports = options;