declare type Input = {
    queryIFrame: string | null;
    queryUTMSource: string | null;
    cookiesFrameAncestorUrl: string | null;
};
export declare const validHostnameRegExp: RegExp;
export default function getFrameAncestor({ queryIFrame, queryUTMSource, cookiesFrameAncestorUrl, }: Input): string;
export {};