import { Any, AnyObject, Options } from "../../../types";
/**
 * Returns a substring of a string, starting at a specified index position and including the specified number of characters.
 * The index is zero-based.
 *
 * See {@link https://www.mongodb.com/docs/manual/reference/operator/aggregation/substrBytes/}.
 */
export declare const $substrBytes: (obj: AnyObject, expr: Any, options: Options) => string;