feat(electron): add electron to project

.gitignore

@@ -4,6 +4,10 @@
 /dist
 /tmp
 /out-tsc
+/app-builds
+/release
+main.js
+*.js.map
 # Only exists if Bazel was run
 /bazel-out
 

main.ts

@@ -0,0 +1,85 @@
+import { app, BrowserWindow, screen as electronScreen } from 'electron';
+import * as path from 'path';
+import * as url from 'url';
+
+let win: BrowserWindow = null;
+const args = process.argv.slice(1);
+const serve = args.some(val => val === '--serve');
+
+function createWindow(): BrowserWindow {
+
+  const size = electronScreen.getPrimaryDisplay().workAreaSize;
+
+  // Create the browser window.
+  win = new BrowserWindow({
+    x: 0,
+    y: 0,
+    width: size.width,
+    height: size.height,
+    webPreferences: {
+      nodeIntegration: true,
+      allowRunningInsecureContent: serve,
+    },
+  });
+
+  if (serve) {
+
+    require('devtron').install();
+    win.webContents.openDevTools();
+
+    require('electron-reload')(__dirname, {
+      electron: require(`${__dirname}/node_modules/electron`)
+    });
+    win.loadURL('http://localhost:4200');
+
+  } else {
+    win.loadURL(url.format({
+      pathname: path.join(__dirname, 'dist/webview-angular-electron/index.html'),
+      protocol: 'file:',
+      slashes: true
+    }));
+  }
+
+  // Emitted when the window is closed.
+  win.on('closed', () => {
+    // Dereference the window object, usually you would store window
+    // in an array if your app supports multi windows, this is the time
+    // when you should delete the corresponding element.
+    win = null;
+  });
+
+  return win;
+}
+
+try {
+
+  app.allowRendererProcessReuse = true;
+
+  // This method will be called when Electron has finished
+  // initialization and is ready to create browser windows.
+  // Some APIs can only be used after this event occurs.
+  // Added 400 ms to fix the black background issue while using transparent window.
+  // More details at https://github.com/electron/electron/issues/15947
+  app.on('ready', () => setTimeout(createWindow, 400));
+
+  // Quit when all windows are closed.
+  app.on('window-all-closed', () => {
+    // On OS X it is common for applications and their menu bar
+    // to stay active until the user quits explicitly with Cmd + Q
+    if (process.platform !== 'darwin') {
+      app.quit();
+    }
+  });
+
+  app.on('activate', () => {
+    // On OS X it's common to re-create a window in the app when the
+    // dock icon is clicked and there are no other windows open.
+    if (win === null) {
+      createWindow();
+    }
+  });
+
+} catch (e) {
+  // Catch Error
+  // throw e;
+}