--- /dev/null
+var $ = require('../internals/export');
+var ReflectMetadataModule = require('../internals/reflect-metadata');
+var anObject = require('../internals/an-object');
+
+var toMetadataKey = ReflectMetadataModule.toKey;
+var ordinaryDefineOwnMetadata = ReflectMetadataModule.set;
+
+// `Reflect.defineMetadata` method
+// https://github.com/rbuckton/reflect-metadata
+$({ target: 'Reflect', stat: true }, {
+ defineMetadata: function defineMetadata(metadataKey, metadataValue, target /* , targetKey */) {
+ var targetKey = arguments.length < 4 ? undefined : toMetadataKey(arguments[3]);
+ ordinaryDefineOwnMetadata(metadataKey, metadataValue, anObject(target), targetKey);
+ }
+});