/**
 * Gets the ancestor origin of the custom app.
 *
 * @example
 * ```typescript
 * import { getAncestorOrigin } from '@cognite/app-sdk';
 *
 * const ancestorOrigin = getAncestorOrigin();
 * console.log(ancestorOrigin);
 * ```
 *
 * @privateRemarks
 * The ancestor origin is the origin of the page that contains the iframe.
 * It is used to determine the origin of the page that the custom app is
 * running in.
 *
 * @returns the ancestor origin of the custom app.
 * @throws an error if the function is not called from within an iframe or
 *  if there are no ancestor origins.
 */
export declare const getAncestorOrigin: () => string;