When sourceStream
errors, raise an error payload instead
#1127
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See https://github.com/graphql/graphql-spec/pull/1099/files#r1799509253
Currently if
sourceStream
generates an error, thenresponseStream
repeats the error. This is the behavior implemented in graphql-js and is problematic.GraphQL captures execution errors and wraps them in an
{ errors: [...] }
payload for query and mutation operations; it should do the same for stream errors in a subscription operation.This PR makes this change. It is technically a breaking change, I think, so will require careful thought.