text: const devCerts = require("office-addin-dev-certs");
  const { CleanWebpackPlugin } = require("clean-webpack-plugin");
  const CopyWebpackPlugin = require("copy-webpack-plugin");
  const HtmlWebpackPlugin = require("html-webpack-plugin");
  const fs = require("fs");
  const webpack = require("webpack");
  
  module.exports = async (env, options) => {
    const dev = options.mode === "development";
    const config = {
      devtool: "source-map",
      entry: {
        polyfill: "@babel/polyfill",
        taskpane: "./src/taskpane/taskpane.ts",
        commands: "./src/commands/commands.ts"
      },
      resolve: {
        extensions: [".ts", ".tsx", ".html", ".js"]
      },
      module: {
        rules: [
          {
            test: /\.ts$/,
            exclude: /node_modules/,
            use: "babel-loader"
          },
          {
            test: /\.tsx?$/,
            exclude: /node_modules/,
            use: "ts-loader"
          },
          {
            test: /\.html$/,
            exclude: /node_modules/,
            use: "html-loader"
          },
          {
            test: /\.(png|jpg|jpeg|gif)$/,
            use: "file-loader"
          }
        ]
      },
      plugins: [
        new CleanWebpackPlugin(),
        new HtmlWebpackPlugin({
          filename: "taskpane.html",
          template: "./src/taskpane/taskpane.html",
          chunks: ["polyfill", "taskpane"]
        }),
        new CopyWebpackPlugin([
          {
            to: "taskpane.css",
            from: "./src/taskpane/taskpane.css"
          }
        ]),
        new HtmlWebpackPlugin({
          filename: "commands.html",
          template: "./src/commands/commands.html",
          chunks: ["polyfill", "commands"]
        }),
        new CopyWebpackPlugin([
          {
            to: "assets",
            from: "./assets"
          }
        ]),
        new CopyWebpackPlugin([
          {
            to: "manifest.xml",
            from: "./manifest.xml",
            transform: (content) => content.toString().replace(/localhost:3000/g, "stak.github.io/excel-addin-table2json")
          }
        ])
      ],
      devServer: {
        headers: {
          "Access-Control-Allow-Origin": "*"
        },      
        https: (options.https !== undefined) ? options.https : await devCerts.getHttpsServerOptions(),
        port: process.env.npm_package_config_dev_server_port || 3000
      },
      output: {
        path: __dirname + '/docs'
      }
    };
  
    return config;
  };
  