requestAnimationFrame() in node.js

requestAnimationFrame.js

const callbacks = [];
const fpsInterval = 1000 / 60;
let time = performance.now();

function requestAnimationFrameLoop() {
    const now = performance.now();
    const delta = now - time;
    if (delta >= fpsInterval) {
        // Adjust next execution time in case this loop took longer to execute
        time = now - (delta % fpsInterval);
        // Clone array in case callbacks pushes more functions to it
        const funcs = callbacks.slice();
        callbacks.length = 0;
        for (let i = 0; i < funcs.length; i++) {
            funcs[i] && funcs[i](now, delta);
        }
    } else {
        setImmediate(requestAnimationFrameLoop);
    }
}

function requestAnimationFrame(func) {
    callbacks.push(func);
    if (callbacks.length === 1) {
        setImmediate(requestAnimationFrameLoop);
    }
    return callbacks.length - 1;
}

function cancelAnimationFrame(id) {
    callbacks[id] = undefined;
}

Polyfill of requestAnimationFrame() for node.js.