The app's registry id — notes, settings. Not its display name.
Required, and it is what stops Back reaching a backgrounded app. Apps are resident, so
this ladder stays registered while the app sits hidden; without an owner the dispatcher
would hand back to whichever app registered last rather than the one on screen.
levels
levels:AppLevel[]
Deepest first. Back closes the first one that is open.
Optionalonback
onback?:()=>void
Where back goes once every level is closed. The shell's onback prop.
title
title:string| (()=>string)
Title when nothing is open — the app's own name, usually.
The app's registry id —
notes,settings. Not its display name.Required, and it is what stops Back reaching a backgrounded app. Apps are resident, so this ladder stays registered while the app sits hidden; without an owner the dispatcher would hand
backto whichever app registered last rather than the one on screen.