utility function to take an array of promises and return an async iterator that yield results as promises settle

onSettled.js

/** @param promises {Array<Promise<unknown>>} */
export async function * onSettled(promises) {
    let wake;
    let wait = new Promise(_ => wake = _);
    let pending = promises.length;
    const queue = [];

    for (const p of promises) {
        Promise.allSettled([p]).then(([result]) => {
            queue.push(result);
            pending--;
            wake();
            wait = new Promise(_ => wake = _);
        });
    }

    while (pending > 0) {
        await wait;
        while (queue.length) {
            yield queue.shift();
        }
    }
}