Detect if an adblocker exists

adblockerDetectAsync.js

/**
 * Detects if an adblocker exists
 * 
 * @example
 * adblockerDetectAsync()
 *     .then(() => console.log('Detected adblocker:', hasAdblocker))
 *     .catch((err) => console.error('[adblockerDetectAsync]', err));
 * 
 * @returns {Promise<boolean>} Returns a Returns a {@link Promise|Promise} that resolves with either true, if an adblocker exists; otherwise, false
 */
function adblockerDetectAsync() {
    return new Promise((resolve) => {
        // Taken from URL: https://christianheilmann.com/2015/12/25/detecting-adblock-without-an-extra-http-overhead/
         const el = document.createElement('div');
         el.innerHTML = '&nbsp;';

         // Taken from URL: https://stackoverflow.com/a/34577648
         el.classList.add('ads', 'ad', 'adsbox', 'doubleclick', 'ad-placement', 'carbon-ads');
         document.body.appendChild(el);

         setTimeout(() => {
            const hasAdblocker = el.offsetHeight === 0;
            
            // See URL: https://developer.mozilla.org/en-US/docs/Web/API/ChildNode/remove
            el.remove();
            resolve(hasAdblocker);
         });
    });
}