webpack.common.js

const path = require("path");
const CleanWebpackPlugin = require("clean-webpack-plugin");
const CopyWebpackPlugin = require("copy-webpack-plugin");
const HtmlWebpackPlugin = require("html-webpack-plugin");
const WriteFilePlugin = require("write-file-webpack-plugin");

const package = require('./package.json');

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

const options = {
  entry: {
    popup: path.join(__dirname, "src", "js", "popup.js"),
    options: path.join(__dirname, "src", "js", "options.js"),
    background: path.join(__dirname, "src", "js", "background.js"),
    oauth_callback: path.join(__dirname, "src", "js", "oauth_callback.js"),
  },
  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: /\.html$/,
        loader: "html-loader",
        exclude: /node_modules/
      },
      {
        test: /\.(js|jsx)$/,
        loader: "babel-loader",
        exclude: /node_modules/
      }
    ]
  },
  resolve: {
    extensions: fileExtensions.map(extension => ("." + extension)).concat([".jsx", ".js", ".css"])
  },
  plugins: [
    // clean the build folder
    new CleanWebpackPlugin(["build"]),
    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: package.description,
          version: 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", "options.html"),
      filename: "options.html",
      chunks: ["options"]
    }),
    new HtmlWebpackPlugin({
      template: path.join(__dirname, "src", "background.html"),
      filename: "background.html",
      chunks: ["background"]
    }),
    new HtmlWebpackPlugin({
      template: path.join(__dirname, "src", "oauth_callback.html"),
      filename: "oauth_callback.html",
      chunks: ["oauth_callback"]
    }),
    new WriteFilePlugin()
  ]
};

module.exports = options;