tryHarder.js

async function tryHarder(howHard, delay, callback) {
    let wait = (milliseconds) => new Promise(resolve => setTimeout(resolve, milliseconds));
    while (true) {
        try {
            return await callback();
        } catch (ex) {
            if (--howHard < 1) throw (ex);
        }
        await wait(delay);
    }
}

nice