Actually expose some methods

src/packager/electron-superpowers.js

@@ -0,0 +1,80 @@
+const exposeBrowserWindowMethods = [
+  // https://www.electronjs.org/docs/latest/api/browser-window
+  'focus',
+  'blur',
+  'isFocused',
+  'show',
+  'showInactive',
+  'hide',
+  'isVisible',
+  'maximize',
+  'unmaximize',
+  'isMaximized',
+  'minimize',
+  'restore',
+  'isMinimized',
+  'isNormal',
+  'setAspectRatio',
+  'setBounds',
+  'getBounds',
+  'setContentBounds',
+  'getContentBounds',
+  'getNormalBounds',
+  'setEnabled',
+  'isEnabled',
+  'setSize',
+  'getSize',
+  'setContentSize',
+  'getContentSize',
+  'setMinimumSize',
+  'getMinimumSize',
+  'setMaximumSize',
+  'getMaximumSize',
+  'setResizable',
+  'isResizable',
+  'setMovable',
+  'isMovable',
+  'setMinimizable',
+  'isMinimizable',
+  'setMaximizable',
+  'isMaximizable',
+  'setClosable',
+  'isClosable',
+  'setAlwaysOnTop',
+  'isAlwaysOnTop',
+  'moveTop',
+  'center',
+  'setPosition',
+  'getPosition',
+  'setProgressBar',
+  'setOpacity',
+  'getOpacity',
+  'setFocusable',
+  'isFocusable'
+];
+
+const main = `
+const {ipcMain, BrowserWindow} = require('electron');
+
+const ALLOWED_METHODS = ${JSON.stringify(exposeBrowserWindowMethods)};
+
+ipcMain.handle('superpowers/BrowserWindow', (event, name, ...args) => {
+  if (!ALLOWED_METHODS.includes(name)) {
+    throw new Error('Unsupported BrowserWindow method: ' + name);
+  }
+  return BrowserWindow.fromWebContents(event.sender)[name](...args);
+});
+`.trimStart();
+
+const preload = `
+const {contextBridge, ipcRenderer} = require('electron');
+
+contextBridge.exposeInMainWorld('PackagerSuperpowers', {
+  BrowserWindow: (name, ...args) => ipcRenderer.invoke('superpowers/BrowserWindow', name, ...args)
+});
+`.trimStart();
+
+export default {
+  main,
+  preload
+};

src/packager/packager.js

@@ -11,7 +11,7 @@ import {APP_NAME, WEBSITE, COPYRIGHT_NOTICE, ACCENT_COLOR} from './brand';
 import {OutdatedPackagerError} from '../common/errors';
 import {darken} from './colors';
 import {Adapter} from './adapter';
-import electronPreloadJS from '!raw-loader!./electron-preload.js';
+import electronSuperpowerScripts from './electron-superpowers';
 
 const PROGRESS_LOADED_SCRIPTS = 0.1;
 
@@ -513,7 +513,8 @@ cd "$(dirname "$0")"
     const contentsPrefix = isMac ? `${rootPrefix}${packageName}.app/Contents/` : rootPrefix;
     const resourcesPrefix = isMac ? `${contentsPrefix}Resources/app/` : `${contentsPrefix}resources/app/`;
     const electronMainName = 'electron-main.js';
-    const electronPreloadName = 'electron-preload.js';
+    const electronSuperpowersMainName = 'electron-superpowers.js';
+    const electronSuperpowersPreloadName = 'electron-preload.js';
     const iconName = 'icon.png';
 
     const icon = await Adapter.getAppIcon(this.options.app.icon);
@@ -527,7 +528,7 @@ cd "$(dirname "$0")"
     zip.file(`${resourcesPrefix}package.json`, JSON.stringify(manifest, null, 4));
 
     const mainJS = `'use strict';
-const {app, BrowserWindow, Menu, shell, screen, dialog} = require('electron');
+const {app, BrowserWindow, Menu, shell, screen, dialog, ipcMain} = require('electron');
 const path = require('path');
 
 const isWindows = process.platform === 'win32';
@@ -560,7 +561,7 @@ const createWindow = (windowOptions) => {
       sandbox: true,
       contextIsolation: true,
       nodeIntegration: false,
-      preload: path.resolve(__dirname, ${JSON.stringify(electronPreloadName)}),
+      preload: path.resolve(__dirname, ${JSON.stringify(electronSuperpowersPreloadName)}),
     },
     show: true,
     width: 480,
@@ -698,9 +699,12 @@ app.on('window-all-closed', () => {
 app.whenReady().then(() => {
   createProjectWindow(defaultProjectURL);
 });
+
+require('./' + ${JSON.stringify(electronSuperpowersMainName)});
 `;
     zip.file(`${resourcesPrefix}${electronMainName}`, mainJS);
-    zip.file(`${resourcesPrefix}${electronPreloadName}`, electronPreloadJS);
+    zip.file(`${resourcesPrefix}${electronSuperpowersMainName}`, electronSuperpowerScripts.main)
+    zip.file(`${resourcesPrefix}${electronSuperpowersPreloadName}`, electronSuperpowerScripts.preload);
 
     for (const [path, data] of Object.entries(projectZip.files)) {
       setFileFast(zip, `${resourcesPrefix}${path}`, data);