/**
 * Removes all occurrences of needle from the beginning of haystack.
 *
 * @param haystack string to trim
 * @param needle the thing to trim
 *
 * @example
 *
 *      ltrim('abcabcHello', 'abc'); //=> 'Hello'
 *      ltrim('  Hello  ');          //=> 'Hello  '
 */
export declare function ltrim(haystack: string, needle?: string): string;