Ha, I found an answer:

https://github.com/grpc/grpc-web/issues/721

Be nice if these sort of details were pulled out issues into the main 
documentation.

On Friday, January 22, 2021 at 1:40:27 PM UTC-5 Rob Cecil wrote:

> Hi, I'm using the generated js code that uses Promises along with TS.
>
> Example method:
>
>   getMenu(
>     request: Menu_pb.GetMenuRequest,
>     metadata?: grpcWeb.Metadata
>   ): Promise<Menu_pb.Menu>;
>
> I have been passing in the deadline via Metadata in the last argument of 
> the generated methods.
>
> How do I interrogate the response trailers using the Promise API ?
>
> Thanks
>

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