RouteInfoWithAttributes is an object that contains
metadata, including the resolved value from the routes
model hook. Like
represents a specific route with in a Transition.
It is read-only and internally immutable. It is also not
observable, because a Transition instance is never
changed after creation.
- the callback to execute
- optional target to use
- Found item or undefined
A reference to the child route's RouteInfo.
This can be used to traverse downward to the