const WCO_CLASS_NAME = "wco"; interface WindowControlsOverlayLike {  readonly visible: boolean;  addEventListener(type: "geometrychange", listener: EventListener): void;  removeEventListener(type: "geometrychange", listener: EventListener): void;} interface NavigatorWithWindowControlsOverlay extends Navigator {  readonly windowControlsOverlay?: WindowControlsOverlayLike;} function getWindowControlsOverlay(): WindowControlsOverlayLike | null {  if (typeof navigator === "undefined") {    return null;  }   return (navigator as NavigatorWithWindowControlsOverlay).windowControlsOverlay ?? null;} export function syncDocumentWindowControlsOverlayClass(): () => void {  if (typeof document === "undefined") {    return () => {};  }   const overlay = getWindowControlsOverlay();  const update = () => {    document.documentElement.classList.toggle(WCO_CLASS_NAME, overlay !== null && overlay.visible);  };   update();  if (!overlay) {    return () => {};  }   overlay.addEventListener("geometrychange", update);  return () => {    overlay.removeEventListener("geometrychange", update);  };}