fix: screenPos() worldPos() correctly type set functionality (and other type errors) (#593)

Author: Daniel Báez

src/components/physics/area.ts

@@ -131,21 +131,24 @@ export interface AreaComp extends Comp {
      *
      * @since v2001.0
      */
-    onCollide(tag: Tag, f: (obj: GameObj, col?: Collision) => void): void;
+    onCollide(
+        tag: Tag,
+        f: (obj: GameObj, col?: Collision) => void,
+    ): KEventController;
     /**
      * Register an event runs once when collide with another game obj.
      *
      * @since v2000.1
      */
-    onCollide(f: (obj: GameObj, col?: Collision) => void): void;
+    onCollide(f: (obj: GameObj, col?: Collision) => void): KEventController;
     /**
      * Register an event runs every frame when collide with another game obj with certain tag.
      *
      * @since v3000.0
      */
     onCollideUpdate(
         tag: Tag,
-        f: (obj: GameObj, col?: Collision) => void,
+        f: (obj: GameObj, col?: Collision) => KEventController,
     ): KEventController;
     /**
      * Register an event runs every frame when collide with another game obj.

src/components/transform/pos.ts

@@ -33,39 +33,48 @@ export interface PosComp extends Comp {
     moveTo(dest: Vec2, speed?: number): void;
     moveTo(x: number, y: number, speed?: number): void;
     /**
-     * Get the position of the object on the screen.
+     * Get / Set the position of the object on the screen.
+     *
+     * @since v2000.0
      */
-    screenPos(): Vec2 | null;
+    screenPos(newPos?: Vec2): Vec2 | null;
     /**
-     * Get the position of the object relative to the root.
+     * Get / Set the position of the object relative to the root.
+     *
+     * @since v2000.0
      */
-    worldPos(): Vec2 | null;
+    worldPos(newPos?: Vec2): Vec2 | null;
     /**
      * Transform a local point (relative to this) to a screen point (relative to the camera)
      */
     toScreen(this: GameObj<PosComp | FixedComp>, p: Vec2): Vec2;
     /**
      * Transform a local point (relative to this) to a world point (relative to the root)
+     *
      * @since v3001.0
      */
     toWorld(this: GameObj<PosComp>, p: Vec2): Vec2;
     /**
      * Transform a screen point (relative to the camera) to a local point (relative to this)
+     *
      * @since v3001.0
      */
     fromScreen(this: GameObj<PosComp | FixedComp>, p: Vec2): Vec2;
     /**
      * Transform a world point (relative to the root) to a local point (relative to this)
+     *
      * @since v3001.0
      */
     fromWorld(this: GameObj<PosComp>, p: Vec2): Vec2;
     /**
      * Transform a point relative to this to a point relative to other
+     *
      * @since v3001.0
      */
     toOther(this: GameObj<PosComp>, other: GameObj<PosComp>, p: Vec2): Vec2;
     /**
      * Transform a point relative to other to a point relative to this
+     *
      * @since v3001.0
      */
     fromOther(this: GameObj<PosComp>, other: GameObj<PosComp>, p: Vec2): Vec2;