es7.reflect.get-metadata.js

var metadata = require('./_metadata');
var anObject = require('./_an-object');
var getPrototypeOf = require('./_object-gpo');
var ordinaryHasOwnMetadata = metadata.has;
var ordinaryGetOwnMetadata = metadata.get;
var toMetaKey = metadata.key;

var ordinaryGetMetadata = function (MetadataKey, O, P) {
  var hasOwn = ordinaryHasOwnMetadata(MetadataKey, O, P);
  if (hasOwn) return ordinaryGetOwnMetadata(MetadataKey, O, P);
  var parent = getPrototypeOf(O);
  return parent !== null ? ordinaryGetMetadata(MetadataKey, parent, P) : undefined;
};

metadata.exp({ getMetadata: function getMetadata(metadataKey, target /* , targetKey */) {
  return ordinaryGetMetadata(metadataKey, anObject(target), arguments.length < 3 ? undefined : toMetaKey(arguments[2]));
} });