export declare function parseYouTubeId(src: string): string | null;
export declare function parseVimeoId(src: string): string | null;
/** The srcset candidate a browser would pick for `width` CSS pixels. */
export declare function pickSrcsetCandidate({ srcset, width, pixelRatio, }: {
    srcset: string;
    width: number;
    pixelRatio: number;
}): string | null;
/**
 * Draws the page's first screen (from the document top, regardless of scroll)
 * into an exact width×height JPEG. Videos and YouTube/Vimeo embeds, which the
 * page cannot read directly, are swapped for their current frame or thumbnail.
 */
export declare function capturePage({ width, height, }: {
    width: number;
    height: number;
}): Promise<Blob>;