externalSignal

Construct an external BindingSignal -- which is a Signal whose value can be updated to new values arbitrarily.

external BindingSignals can be thought of (together with external BroadcastEvents) as the "inputs" to the Yafrl FRP state graph, and thus should typically only be used as a means of integrating with external systems -- rather than for business logic.

If you need a BindingSignal for internal use to implement some buisness logic, this practice is generally discouraged, but internalBindingState can be used for this purpose if it is necessary.