text: import _curry1 from './internal/_curry1';
  import _has from './internal/_has';
  import _isArguments from './internal/_isArguments';
  
  // cover IE < 9 keys issues
  var hasEnumBug = !({toString: null}).propertyIsEnumerable('toString');
  var nonEnumerableProps = [
    'constructor', 'valueOf', 'isPrototypeOf', 'toString',
    'propertyIsEnumerable', 'hasOwnProperty', 'toLocaleString'
  ];
  // Safari bug
  var hasArgsEnumBug = (function() {
    'use strict';
    return arguments.propertyIsEnumerable('length');
  }());
  
  var contains = function contains(list, item) {
    var idx = 0;
    while (idx < list.length) {
      if (list[idx] === item) {
        return true;
      }
      idx += 1;
    }
    return false;
  };
  
  /**
   * Returns a list containing the names of all the enumerable own properties of
   * the supplied object.
   * Note that the order of the output array is not guaranteed to be consistent
   * across different JS platforms.
   *
   * @func
   * @memberOf R
   * @since v0.1.0
   * @category Object
   * @sig {k: v} -> [k]
   * @param {Object} obj The object to extract properties from
   * @return {Array} An array of the object's own properties.
   * @see R.keysIn, R.values
   * @example
   *
   *      R.keys({a: 1, b: 2, c: 3}); //=> ['a', 'b', 'c']
   */
  var keys = typeof Object.keys === 'function' && !hasArgsEnumBug ?
    _curry1(function keys(obj) {
      return Object(obj) !== obj ? [] : Object.keys(obj);
    }) :
    _curry1(function keys(obj) {
      if (Object(obj) !== obj) {
        return [];
      }
      var prop, nIdx;
      var ks = [];
      var checkArgsLength = hasArgsEnumBug && _isArguments(obj);
      for (prop in obj) {
        if (_has(prop, obj) && (!checkArgsLength || prop !== 'length')) {
          ks[ks.length] = prop;
        }
      }
      if (hasEnumBug) {
        nIdx = nonEnumerableProps.length - 1;
        while (nIdx >= 0) {
          prop = nonEnumerableProps[nIdx];
          if (_has(prop, obj) && !contains(ks, prop)) {
            ks[ks.length] = prop;
          }
          nIdx -= 1;
        }
      }
      return ks;
    });
  export default keys;
  