title: How to configure in forge.config.js two different renderer processes?
body: <p>I need to open a second electron browserWindow in an Electron-React-Typescript app which I'm building using Electron-Forge,
  and I tried to configure in forge.config.js two different renderer processes:</p>
  <pre><code>/* eslint-disable @typescript-eslint/no-var-requires */
  // Forge Configuration
  const path = require('path');
  const rootDir = process.cwd();
  
  module.exports = {
    // Packager Config
    packagerConfig: {
      // Create asar archive for main, renderer process files
      asar: true,
    },
    // Forge Makers
    makers: [
      {
        // Squirrel.Windows is a no-prompt, no-hassle, no-admin method of installing
        // Windows applications and is therefore the most user friendly you can get.
        name: '@electron-forge/maker-squirrel',
        config: {
          name: 'trial_ipc_2020',
        },
      },
      {
        // The Zip target builds basic .zip files containing your packaged application.
        // There are no platform specific dependencies for using this maker and it will run on any platform.
        name: '@electron-forge/maker-zip',
        platforms: ['darwin'],
      },
      {
        // The deb target builds .deb packages, which are the standard package format for Debian-based
        // Linux distributions such as Ubuntu.
        name: '@electron-forge/maker-deb',
        config: {},
      },
      {
        // The RPM target builds .rpm files, which is the standard package format for
        // RedHat-based Linux distributions such as Fedora.
        name: '@electron-forge/maker-rpm',
        config: {},
      },
    ],
    // Forge Plugins
    plugins: [
      [
        // The Webpack plugin allows you to use standard Webpack tooling to compile both your main process code
        // and your renderer process code, with built in support for Hot Module Reloading in the renderer
        // process and support for multiple renderers.
        '@electron-forge/plugin-webpack',
        {
          // Main process webpack configuration
          mainConfig: path.join(rootDir, 'tools/webpack/webpack.main.js'),
          // Renderer process webpack configuration
          renderer: {
            // Configuration file path
            config: path.join(rootDir, 'tools/webpack/webpack.renderer.js'),
           // Entrypoints of the application
            entryPoints: [
              {
                // React Hot Module Replacement (HMR)
                rhmr: 'react-hot-loader/patch',
                // HTML index file template
                html: path.join(rootDir, 'src/index.html'),
                // Renderer
                // https://www.electronjs.org/docs/tutorial/quick-start#main-and-renderer-processes
                // https://github.com/electron-userland/electron-webpack/issues/47
                //js: path.join(rootDir, 'src/renderer.ts'),
                js: path.join(rootDir, ['src/renderer.ts', 'src/renderer-2.ts']),
                // Main Window
                name: 'main_window',
                // Preload
                preload: {
                  js: path.join(rootDir, 'src/preload.ts'),
                },
              },
            ],
          },
        },
      ],
    ],
  };
  </code></pre>
  <p>Got this error:</p>
  <pre><code>(base) marco@pc01:~/webMatters/electronMatters/trial-ipc$ yarn start
  yarn run v1.22.5
  $ cross-env NODE_ENV=development electron-forge start
  ✔ Checking your system
  ✔ Locating Application
  Failed to load: /home/marco/webMatters/electronMatters/trial-ipc/tools/forge/forge.config.js
  
  An unhandled rejection has occurred inside Forge:
  TypeError [ERR_INVALID_ARG_TYPE]: The &quot;path&quot; argument must be of type string. Received an instance of Array
      at validateString (internal/validators.js:121:11)
      at Object.join (path.js:1039:7)
      at Object.&lt;anonymous&gt; (/home/marco/webMatters/electronMatters/trial-ipc/tools/forge/forge.config.js:66:24)
  </code></pre>
  <p>So.. I have two questions:
  is it feasible to open two browserWindow using electron-forge as tool for creating and managing the electron app?
  And how to properly do it?</p>
  <p>Looking forward to your kind help</p>