2.1.59 [ECMA-262/9:2018] Section 25.5 AsyncGenerator Objects

V0217: AsyncGenerator objects are not supported

The specification states:

 25.5 AsyncGenerator Objects
     An AsyncGenerator object is an instance of an async generator function and conforms 
     to both the AsyncIterator and AsyncIterable interfaces.
     AsyncGenerator instances directly inherit properties from the object that is the 
     value of the prototype property of the AsyncGenerator function that created the 
     instance. AsyncGenerator instances indirectly inherit properties from the 
     AsyncGenerator Prototype intrinsic, %AsyncGeneratorPrototype%.

EdgeHTML Mode

AsyncGenerator objects are not supported.