Finish testing

engine/system/animateSprites.ts

@@ -5,7 +5,7 @@ import {
 	type SpritePlayback,
 } from "#/engine/Sprite.ts";
 
-export function animateSprites(delta: number) {
+export function animateSprites(delta: number): void {
 	for (const [id, playback] of $<SpritePlayback>("playback").entries()) {
 		const sprite = $<Sprite>("sprite").get(id)!;
 		animateSprite(sprite.value, playback.value, delta);