Remove windowManager from extension api (#1323)

Signed-off-by: Jari Kolehmainen <jari.kolehmainen@gmail.com>

src/main/index.ts

@@ -78,7 +78,7 @@ app.on("ready", async () => {
     app.exit();
   }
 
-  LensExtensionsApi.windowManager = windowManager = new WindowManager(proxyPort);
+  windowManager = WindowManager.getInstance<WindowManager>(proxyPort);
   extensionLoader.init(await extensionManager.load()); // call after windowManager to see splash earlier
 
   setTimeout(() => {

src/main/tray.ts

@@ -16,7 +16,7 @@ import { isDevelopment } from "../common/vars";
 export let tray: Tray;
 
 // refresh icon when MacOS dark/light theme has changed
-nativeTheme.on("updated", () => tray?.setImage(getTrayIcon()));
+nativeTheme?.on("updated", () => tray?.setImage(getTrayIcon()));
 
 export function getTrayIcon(isDark = nativeTheme.shouldUseDarkColors): string {
   return path.resolve(

src/main/window-manager.ts

@@ -7,8 +7,9 @@ import { extensionLoader } from "../extensions/extension-loader";
 import { appEventBus } from "../common/event-bus"
 import { initMenu } from "./menu";
 import { initTray } from "./tray";
+import { Singleton } from "../common/utils";
 
-export class WindowManager {
+export class WindowManager extends Singleton {
   protected mainWindow: BrowserWindow;
   protected splashWindow: BrowserWindow;
   protected windowState: windowStateKeeper.State;
@@ -17,6 +18,7 @@ export class WindowManager {
   @observable activeClusterId: ClusterId;
 
   constructor(protected proxyPort: number) {
+    super();
     this.bindEvents();
     this.initMenu();
     this.initTray();