How to integrate ECS into a game loop

Option A — Use world.update(dt)

1. Register systems with addSystem(...)
2. In your loop call:

function tick(dt: number) {
  world.update(dt); // runs systems, then flushes
}

Option B — Use Schedule phases (recommended for games)

1. Build a schedule (input, sim, render)
2. In requestAnimationFrame:

let last = performance.now();

function frame(now: number) {
  const dt = (now - last) / 1000;
  last = now;

  sched.run(world, dt, ["input", "sim", "render"]); // flush between phases
  renderer.render(scene, camera);

  requestAnimationFrame(frame);
}

requestAnimationFrame(frame);