/**
 * String Expression Operators: https://docs.mongodb.com/manual/reference/operator/aggregation/#string-expression-operators
 */
import { ExpressionOperator } from "../../../core";
/**
 * Searches a string for an occurrence of a substring and returns the UTF-8 code point index of the first occurence.
 * If the substring is not found, returns -1.
 *
 * @param  {AnyObject} obj
 * @param  {*} expr
 * @return {*}
 */
export declare const $indexOfBytes: ExpressionOperator;
