Game.js

const level = new Level(); // game logic
const timer = new Timer(1/60);
timer.update = function update(deltaTime) {
  level.update(deltaTime);
};

timer.start();

Timer.js

export default class Timer {
  constructor(deltaTime = 1/60) {
    let accumulatedTime = 0;
    let lastTime = 0;

    this.updateProxy = (time) => {
      accumulatedTime += (time - lastTime)/1000;

      if (accumulatedTime > 1) {
        accumulatedTime = 1;
      }

      while(accumulatedTime > deltaTime) {
        this.update(deltaTime);
        accumulatedTime -= deltaTime;
      }

      lastTime = time;

      this.enqueue();
    }
  }

  enqueue() {
    requestAnimationFrame(this.updateProxy);
  }

  start() {
    this.enqueue();
  }
}