var $ = require('../internals/export');
var getCompositeKeyNode = require('../internals/composite-key');
var getBuiltIn = require('../internals/get-built-in');
var create = require('../internals/object-create');

var initializer = function () {
  var freeze = getBuiltIn('Object', 'freeze');
  return freeze ? freeze(create(null)) : create(null);
};

// https://github.com/tc39/proposal-richer-keys/tree/master/compositeKey
$({ global: true }, {
  compositeKey: function compositeKey() {
    return getCompositeKeyNode.apply(Object, arguments).get('object', initializer);
  }
});