fix: some functions not return a KEventController

src/app/app.ts

@@ -620,11 +620,11 @@ export const initApp = (opt: {
     }
 
     function onGamepadConnect(action: (gamepad: KGamepad) => void) {
-        state.events.on("gamepadConnect", action);
+        return state.events.on("gamepadConnect", action);
     }
 
     function onGamepadDisconnect(action: (gamepad: KGamepad) => void) {
-        state.events.on("gamepadDisconnect", action);
+        return state.events.on("gamepadDisconnect", action);
     }
 
     function getGamepadStick(stick: GamepadStick): Vec2 {

src/game/events/events.ts

@@ -187,22 +187,22 @@ export function onHoverEnd(
 }
 
 export function onLoading(action: (progress: number) => void) {
-    game.events.on("loading", action);
+    return game.events.on("loading", action);
 }
 
 export function onResize(action: () => void) {
-    app.onResize(action);
+    return app.onResize(action);
 }
 
 export function onError(action: (err: Error) => void) {
-    game.events.on("error", action);
+    return game.events.on("error", action);
 }
 
-export function onLoad(cb: () => void): void {
+export function onLoad(cb: () => void) {
     if (assets.loaded) {
         cb();
     }
     else {
-        game.events.on("load", cb);
+        return game.events.on("load", cb);
     }
 }

src/types.ts

@@ -1296,28 +1296,28 @@ export interface KAPLAYCtx<
      * ```
      * @group Events
      */
-    onLoad(action: () => void): void;
+    onLoad(action: () => void): KEventController | undefined;
     /**
      * Register an event that runs every frame when assets are initially loading. Can be used to draw a custom loading screen.
      *
      * @since v3000.0
      * @group Events
      */
-    onLoading(action: (progress: number) => void): void;
+    onLoading(action: (progress: number) => void): KEventController;
     /**
      * Register a custom error handler. Can be used to draw a custom error screen.
      *
      * @since v3000.0
      * @group Events
      */
-    onError(action: (err: Error) => void): void;
+    onError(action: (err: Error) => void): KEventController;
     /**
      * Register an event that runs when the canvas resizes.
      *
      * @since v3000.0
      * @group Events
      */
-    onResize(action: () => void): void;
+    onResize(action: () => void): KEventController;
     /**
      * Cleanup function to run when quit() is called.
      *
@@ -1331,14 +1331,14 @@ export interface KAPLAYCtx<
      * @since v3000.0
      * @group Input
      */
-    onGamepadConnect(action: (gamepad: KGamepad) => void): void;
+    onGamepadConnect(action: (gamepad: KGamepad) => void): KEventController;
     /**
      * Register an event that runs when a gamepad is disconnected.
      *
      * @since v3000.0
      * @group Input
      */
-    onGamepadDisconnect(action: (gamepad: KGamepad) => void): void;
+    onGamepadDisconnect(action: (gamepad: KGamepad) => void): KEventController;
     /**
      * Register an event that runs once when 2 game objs with certain tags collides (required to have area() component).
      *
@@ -1910,7 +1910,10 @@ export interface KAPLAYCtx<
      *
      * @group Assets
      */
-    loadSound(name: string | null, src: string | ArrayBuffer | AudioBuffer): Asset<SoundData>;
+    loadSound(
+        name: string | null,
+        src: string | ArrayBuffer | AudioBuffer,
+    ): Asset<SoundData>;
     /**
      * Like loadSound(), but the audio is streamed and won't block loading. Use this for big audio files like background music.
      *