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 = {};

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: {
    content: [
      path.join(__dirname, "src", "js", "content.js"),
      path.join(__dirname, "src", "css", "content.scss")
    ],
    background: path.join(__dirname, "src", "js", "background.js")
  },
  output: {
    path: path.join(__dirname, "build"),
    filename: "[name].bundle.js"
  },
  module: {
    rules: [
      {
        test: /\.css$/,
        loader: "style-loader!css-loader",
        exclude: /node_modules/
      },
      {
        test: /\.scss$/,
        use: [
            "style-loader", // creates style nodes from JS strings
            "css-loader", // translates CSS into CommonJS
            "sass-loader" // compiles Sass to CSS, using Node Sass by default
        ]
    },
      {
        test: new RegExp('\.(' + fileExtensions.join('|') + ')$'),
        loader: "file-loader?name=[name].[ext]",
        exclude: /node_modules/
      },
      // {
      //   test: /\.html$/,
      //   loader: "html-loader",
      //   exclude: /node_modules/
      // }
    ]
  },
  resolve: {
    alias: alias
  },
  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([{
      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", "content.html"),
    //   filename: "content.html",
    //   chunks: ["content"]
    // }),
    // 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;