Function lazyLoadResumable

public/js/upload.js:490–496

()

}

function lazyLoadResumable() {
  if (window.Resumable) return Promise.resolve(window.Resumable);
  if (!_resumableLoadPromise) {
    _resumableLoadPromise = loadScriptOnce(RESUMABLE_SRC).then(() => window.Resumable);
  }
  return _resumableLoadPromise;
}

// Optional: let main.js prefetch it in the background
export function warmUpResumable() {