Fibers with async await

fibers.js

    var prev = Date.now();
    var callbacks;
    function wait() {
        return new Promise((resolve) => {
            if (Date.now() > prev + 8) {
                if (callbacks === undefined) {
                    callbacks = [];
                    callbacks.push(resolve);
                    requestAnimationFrame(() => {
                        prev = Date.now();
                        callbacks.forEach(fn => fn());
                        callbacks = undefined;
                    });
                } else {
                    callbacks.push(resolve);
                }
                return;
            }
            resolve();
        });
    }
    async function work() {
        await wait();
        return 123;
    }
    async function main() {
        for (let i = 0; i < 1e8; i++) {
            await work()
        }
    }
    main().catch(console.error);
    setInterval(() => { console.log(123); }, 1000);