Current hydrated state, or null until the first snapshot after connecting.
Runs immediately and after every later state update, reset, or synchronization-freshness change. The same state identity may be delivered when only freshness changes. Null means no hydrated state is currently available.
Optionaloptions: SubscriptionOptionsRuns immediately for the first selected value, including unavailable state, and reevaluates after state, reset, or synchronization-freshness changes. The listener runs according to the configured equality function.
Optionaloptions: WatchOptions<T>Wait for the first state snapshot. The default timeout is 10 seconds; zero disables the timeout.
Optionaloptions: ReadyOptionsWait for a complete snapshot belonging to the current transport generation.
Optionaloptions: ReadyOptions
True only when state belongs to the current connected transport generation.