Discriminated outcome of a subscription operation.
Three arms because the wire needs the distinction:
'error'
error
complete
'single'
next
'stream'
0.3.0
Discriminated outcome of a subscription operation.
Three arms because the wire needs the distinction:
'error'— a request error (parse, validation, operation resolution); the WS transport emitserrorand NOcomplete.'single'— a query or mutation that executed; onenextthencomplete.'stream'— a true subscription; manynextthencomplete.