import { Any, AnyObject, Options } from "../../types";
/**
 * Computes and returns the hash value of the input expression. A hash function maps a key or string to a fixed-size numeric value.
 * The user-defined hash function is used when provided, otherwise the internal default is used.
 *
 * See {@link https://docs.mongodb.com/manual/reference/operator/aggregation/toHashedIndexKey/}
 */
export declare const $toHashedIndexKey: (obj: AnyObject, expr: Any, options: Options) => number;