rvx/dist/es/test/poll.js

A signal based rendering library

export class PollTimeoutError extends Error {
}
export async function poll(fn, timeout) {
    const ac = new AbortController();
    let timer;
    if (timeout !== undefined) {
        timer = setTimeout(() => ac.abort(new PollTimeoutError()), timeout);
    }
    try {
        for (;;) {
            const value = await fn(ac.signal);
            if (value) {
                return value;
            }
            ac.signal.throwIfAborted();
            await new Promise(r => setTimeout(r, 0));
        }
    }
    finally {
        clearTimeout(timer);
    }
}
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