When the ad script finishes loading, window.nitroAds.loaded will be set to true. If the script is loaded asynchronous, this variable may not be available immediately.

A custom event, nitroAds.loaded, is also fired on the document when loading is completed.

if (window.nitroAds && window.nitroAds.loaded) {
  // nitroAds was already loaded
} else {
  // wait for loaded event
  document.addEventListener("nitroAds.loaded", event => {
    // nitroAds just loaded
  });
}
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