a FPS generator control utility

fps_gen.ts

async function* nextFrame(fps: number) {
    let then = performance.now();
    const interval = 1000 / fps;
    let delta = 0;

    while (true) {
        let now = await new Promise(requestAnimationFrame);
        if (now - then < interval - delta) {
            continue;
        };
        delta = Math.min(interval, delta + now - then - interval);
        yield (now - then);
        then = now;
    }
}

export { nextFrame };