2.1.58 [ECMA-262/9:2018] Section 25.3 AsyncGeneratorFunction Objects
V0213: AsyncGenerator objects are not supported
The specification states:
25.3 AsyncGeneratorFunction Objects AsyncGeneratorFunction objects are functions that are usually created by evaluating AsyncGeneratorDeclaration, AsyncGeneratorExpression, and AsyncGeneratorMethod syntactic productions. They may also be created by calling the %AsyncGeneratorFunction% intrinsic.
AsyncGenerators objects are