import type { PPTAudioElement, PPTVideoElement } from '../types/slides';
type MediaPosterElement = PPTVideoElement | PPTAudioElement;
export default _default;
declare function _default(element: () => MediaPosterElement, slideId?: () => string | undefined): {
    synthesizing: boolean;
    displayPoster: string;
    persistPoster: (next: string) => void;
};