Reflect

The Reflect namespace object contains static methods for invoking interceptable JavaScript object internal methods. The methods are the same as those of proxy handlers.

Unlike most global objects, Reflect is not a constructor. You cannot use it with the new operator or invoke the Reflect object as a function. All properties and methods of Reflect are static (just like the Math object).

The Reflect object provides a collection of static functions which have the same names as the proxy handler methods.

The major use case of Reflect is to provide default forwarding behavior in Proxy handler traps. A trap is used to intercept an operation on an object — it provides a custom implementation for an object internal method. The Reflect API is used to invoke the corresponding internal method. For example, the code below creates a proxy p with a deleteProperty trap that intercepts the [[Delete]] internal method. Reflect.deleteProperty() is used to invoke the default [[Delete]] behavior on targetObject directly. You can replace it with delete, but using Reflect saves you from having to remember the syntax that each internal method corresponds to.