video-ad-sdk/dist/vastRequest/helpers/adUtils.js

VAST/VPAID SDK that allows video ads to be played on top of any player

const requested = Symbol('requested');
export const markAdAsRequested = (ad) => {
    ad[requested] = true;
};
export const unmarkAdAsRequested = (ad) => {
    delete ad[requested];
};
export const hasAdBeenRequested = (ad) => Boolean(ad[requested]);