ReadonlyappThe application the connection belongs to.
ReadonlyclosedAborts when the connection disconnects. Drop per-client state here.
ReadonlymoduleThe federation module id of the connection. Equals appId when the host supplied none.
Writes a state value to this connection only. Ignored once the connection has closed.
Rejects a state topic for this connection: its pending and later MessageBus.query
calls reject with a MessageBusError whose code is 'REFUSED', until the host next
writes a value with MessageBusClient.emit, which clears the rejection.
Optionalmessage: stringA rejected promise cannot be un-rejected and an errored subject cannot resume, so the
rejection is tracked per connection alongside the topic's subject rather than by erroring
it: query consults it before awaiting, and MessageBus.subscribe and the topic's
MessageBusStateSource stay silent (they never error) until a value is written.
Ignored once the connection has closed, the same as MessageBusClient.emit.
The host's handle to one connection: who it is, when it closes, and where to write its state.