core-js/modules/esnext.reflect.define-metadata.js

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);
  }
});