.js

function delay(ms) {
    // error checking wouldn't hurt
    return new Promise(resolve => setTimeout(resolve, delay));
}
function retryWithDelay(fn, delay, retries) {
    if (retries <= 0) {
        return Promise.reject(new Error('out of retries'));
    }
    return fn().catch(err => {
        // typed catch or checking the kind of error here would be a good thing
        if (err.code !== 'the thing you expect') { throw err; }
        return delay(delay).then(() =>
            retryWithDelay(fn, delay, retries - 1)
        );
    });
}

with-bluebird.js

function retryWithDelay(fn, delay, retries) {
    return Promise.try(() => {
        if (retries <= 0) { throw new Error('out of retries'); }
        return fn();
    }).catch(err => {
        // typed catch or checking the kind of error here would be a good thing
        if (err.code !== 'the thing you expect') { throw err; }
        return Promise.delay(delay).then(() =>
            retryWithDelay(fn, delay, retries - 1)
        );
    });
}