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define(['./_baseToString', './_castSlice', './_charsStartIndex', './_stringToArray', './toString'], function(baseToString, castSlice, charsStartIndex, stringToArray, toString) {
  /** Used as a safe reference for `undefined` in pre-ES5 environments. */  var undefined;
  /** Used to match leading and trailing whitespace. */  var reTrimStart = /^\s+/;
  /**   * Removes leading whitespace or specified characters from `string`.   *   * @static   * @memberOf _   * @since 4.0.0   * @category String   * @param {string} [string=''] The string to trim.   * @param {string} [chars=whitespace] The characters to trim.   * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.   * @returns {string} Returns the trimmed string.   * @example   *   * _.trimStart('  abc  ');   * // => 'abc  '   *   * _.trimStart('-_-abc-_-', '_-');   * // => 'abc-_-'   */  function trimStart(string, chars, guard) {    string = toString(string);    if (string && (guard || chars === undefined)) {      return string.replace(reTrimStart, '');    }    if (!string || !(chars = baseToString(chars))) {      return string;    }    var strSymbols = stringToArray(string),        start = charsStartIndex(strSymbols, stringToArray(chars));
    return castSlice(strSymbols, start).join('');  }
  return trimStart;});