1234567891011121314151617181920212223
define(['./_Symbol', './isArguments', './isArray'], function(Symbol, isArguments, isArray) {
  /** Used as a safe reference for `undefined` in pre-ES5 environments. */  var undefined;
  /** Built-in value references. */  var spreadableSymbol = Symbol ? Symbol.isConcatSpreadable : undefined;
  /**   * Checks if `value` is a flattenable `arguments` object or array.   *   * @private   * @param {*} value The value to check.   * @returns {boolean} Returns `true` if `value` is flattenable, else `false`.   */  function isFlattenable(value) {    return isArray(value) || isArguments(value) ||      !!(spreadableSymbol && value && value[spreadableSymbol]);  }
  return isFlattenable;});