Re: [whatwg/streams] JSIDL vs WebIDL (#45)

Oh, I thought that 4.2.3 and 4.8.9 says it returns Promise or undefined.

>write(chunk, controller) is called when a new chunk of data is ready to be written to the underlying sink. It can return a promise to signal success or failure of the write operation.

>Let sinkWritePromise be ! PromiseInvokeOrNoop(controller.[[underlyingSink]], "write", « chunk, controller »).

>PromiseInvokeOrNoop is a specialized version of promise-calling that both works on methods and returns a promise for undefined when the method is not present. 


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