/**
 * Find the nth instance of the query string
 * @param str - String to search across
 * @param query - String to search for
 * @param n - nth instance
 * @return Index of the nth query string or -1
 */
export declare const nthIndexOf: (str: string, query: string, n?: number) => number;
/**
 * Create a random string from some alphabet
 * @param length - Length of the random string
 * @param alphabet - Possible characters
 * @return Random string
 */
export declare const randomString: (length: number, alphabet?: string) => string;