Refactor getInstance() methods

src/modules/mkb/mkb-handler.ts

@@ -124,14 +124,8 @@ This class uses some code from Yuzu emulator to handle mouse's movements
 Source: https://github.com/yuzu-emu/yuzu-mainline/blob/master/src/input_common/drivers/mouse.cpp
 */
 export class EmulatedMkbHandler extends MkbHandler {
-    static #instance: EmulatedMkbHandler;
-    public static getInstance(): EmulatedMkbHandler {
-        if (!EmulatedMkbHandler.#instance) {
-            EmulatedMkbHandler.#instance = new EmulatedMkbHandler();
-        }
-
-        return EmulatedMkbHandler.#instance;
-    }
+    private static instance: EmulatedMkbHandler;
+    public static getInstance = () => EmulatedMkbHandler.instance ?? (EmulatedMkbHandler.instance = new EmulatedMkbHandler());
 
     #CURRENT_PRESET_DATA = MkbPreset.convert(MkbPreset.DEFAULT_PRESET);
 

src/modules/mkb/native-mkb-handler.ts

@@ -23,6 +23,8 @@ type XcloudInputSink = {
 
 export class NativeMkbHandler extends MkbHandler {
     private static instance: NativeMkbHandler;
+    public static getInstance = () => NativeMkbHandler.instance ?? (NativeMkbHandler.instance = new NativeMkbHandler());
+
     #pointerClient: PointerClient | undefined;
     #enabled: boolean = false;
 
@@ -37,14 +39,6 @@ export class NativeMkbHandler extends MkbHandler {
 
     #$message?: HTMLElement;
 
-    public static getInstance(): NativeMkbHandler {
-        if (!NativeMkbHandler.instance) {
-            NativeMkbHandler.instance = new NativeMkbHandler();
-        }
-
-        return NativeMkbHandler.instance;
-    }
-
     #onKeyboardEvent(e: KeyboardEvent) {
         if (e.type === 'keyup' && e.code === 'F8') {
             e.preventDefault();

src/modules/mkb/pointer-client.ts

@@ -15,13 +15,7 @@ enum PointerAction {
 
 export class PointerClient {
     private static instance: PointerClient;
-    public static getInstance(): PointerClient {
-        if (!PointerClient.instance) {
-            PointerClient.instance = new PointerClient();
-        }
-
-        return PointerClient.instance;
-    }
+    public static getInstance = () => PointerClient.instance ?? (PointerClient.instance = new PointerClient());
 
     private socket: WebSocket | undefined | null;
     private mkbHandler: MkbHandler | undefined;