declare type PropertyKey = string | number | symbol; declare namespace Reflect { function apply(target: Function, thisArgument: any, argumentsList: ArrayLike): any; function construct(target: Function, argumentsList: ArrayLike, newTarget?: any): any; function defineProperty(target: any, propertyKey: PropertyKey, attributes: PropertyDescriptor): boolean; function deleteProperty(target: any, propertyKey: PropertyKey): boolean; function get(target: any, propertyKey: PropertyKey, receiver?: any): any; function getOwnPropertyDescriptor(target: any, propertyKey: PropertyKey): PropertyDescriptor; function getPrototypeOf(target: any): any; function has(target: any, propertyKey: string): boolean; function has(target: any, propertyKey: symbol): boolean; function isExtensible(target: any): boolean; function ownKeys(target: any): Array; function preventExtensions(target: any): boolean; function set(target: any, propertyKey: PropertyKey, value: any, receiver?: any): boolean; function setPrototypeOf(target: any, proto: any): boolean; } export = Reflect;