import { DocumentReference, CollectionReference, MetaType } from '../types';
/**
 * Returns true if the provided references are equal.
 *
 * @param left - A reference to compare.
 * @param right - A reference to compare.
 * @returns true if the references point to the same location in the same
 * Firestore database.
 */
export declare const refEqual: <T extends DocumentReference<MetaType> | CollectionReference<MetaType>, U extends T>(left: T, right: U) => boolean;