This is experimental support.
The implementation is based on conduit and is boring. There is a new
resolver data constructor that should create a source event stream. The
executor receives the events, pipes them through the normal execution
and puts them into the response stream which is returned to the user.
- Tests are missing.
- The executor should check field value resolver on subscription types.
- The graphql function should probably return (Either
ResponseEventStream Response), but I'm not sure about this. It will
make the usage more complicated if no subscriptions are involved, but
with the current API implementing subscriptions is more
difficult than it should be.
