1var Set = require('./es6.set');
2var from = require('./_array-from-iterable');
3var metadata = require('./_metadata');
4var anObject = require('./_an-object');
5var getPrototypeOf = require('./_object-gpo');
6var ordinaryOwnMetadataKeys = metadata.keys;
7var toMetaKey = metadata.key;
8
9var ordinaryMetadataKeys = function (O, P) {
10  var oKeys = ordinaryOwnMetadataKeys(O, P);
11  var parent = getPrototypeOf(O);
12  if (parent === null) return oKeys;
13  var pKeys = ordinaryMetadataKeys(parent, P);
14  return pKeys.length ? oKeys.length ? from(new Set(oKeys.concat(pKeys))) : pKeys : oKeys;
15};
16
17metadata.exp({ getMetadataKeys: function getMetadataKeys(target /* , targetKey */) {
18  return ordinaryMetadataKeys(anObject(target), arguments.length < 2 ? undefined : toMetaKey(arguments[1]));
19} });
20