webpack.config.js

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

// load the secrets
var alias = {};

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

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

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

const loadersPath = path.join(__dirname, "config", "loaders")
const loaders = {
  css: require(path.join(loadersPath, "css")),
  sass: require(path.join(loadersPath, "sass")),
  assets: require(path.join(loadersPath, "assets")),
  html: require(path.join(loadersPath, "html")),
  babel: require(path.join(loadersPath, "babel"))
}

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"),
    highlight: path.join(__dirname, "src", "js", "content_scripts", "highlight.js")
  },
  chromeExtensionBoilerplate: {
    notHotReload: ["highlight"]
  },
  output: {
    path: path.join(__dirname, "build"),
    filename: "[name].bundle.js"
  },
  module: {
    rules: [
      loaders.css,
      loaders.sass,
      loaders.assets,
      loaders.html,
      loaders.babel
    ]
  },
  resolve: {
    alias: alias,
    extensions: fileExtensions.map(extension => ("." + extension)).concat([".jsx", ".js", ".css", ".sass"])
  },
  plugins: [
    // clean the build folder
    new CleanWebpackPlugin(),
    // expose and write the allowed env vars on the compiled bundle
    new webpack.EnvironmentPlugin(["NODE_ENV"]),
    new CopyWebpackPlugin([{
      from: "src/manifest.json",
      transform: function (content, path) {
        // generates the manifest file using the package.json informations
        return Buffer.from(JSON.stringify({
          description: process.env.npm_package_description,
          version: process.env.npm_package_version,
          ...JSON.parse(content.toString())
        }))
      }
    }]),
    new HtmlWebpackPlugin({
      template: path.join(__dirname, "src", "popup.html"),
      filename: "popup.html",
      chunks: ["popup"]
    }),
    new HtmlWebpackPlugin({
      template: path.join(__dirname, "src", "background.html"),
      filename: "background.html",
      chunks: ["background"]
    }),
    new WriteFilePlugin()
  ]
};

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

module.exports = options;