/**
 * Finds the first occurrence of a string between two other strings.
 * @param str - The string to search in.
 * @param start - The starting string to search for.
 * @param end - The ending string to search for.
 * @returns The substring between the start and end strings, or an empty string if not found.
 */
export declare const findStringBetween: (str: string, start: string, end: string) => string;