The mutable process holder of the navigation state. The pure transitions in
mobile.navigation.ts return an immutable MobileNavigationState; the
events copy the result into this holder in place, so a service value (and any
object a caller passed to a layer) is never reassigned.
The mutable process holder of the navigation state. The pure transitions in
mobile.navigation.tsreturn an immutable MobileNavigationState; the events copy the result into this holder in place, so a service value (and any object a caller passed to a layer) is never reassigned.