CupertinoTheme.brightnessOf

CupertinoThemeData.resolveFrom

NoDefaultCupertinoThemeData.resolveFrom

CupertinoTextThemeData.resolveFrom

MaterialBasedCupertinoThemeData.resolveFrom

And introduced these new APIs alongside those, to return a nullable
value:

MediaQuery.maybeOf

Navigator.maybeOf

ScaffoldMessenger.maybeOf

Scaffold.maybeOf

Router.maybeOf

Localizations.maybeLocaleOf

FocusTraversalOrder.maybeOf

FocusTraversalGroup.maybeOf

Focus.maybeOf

Shortcuts.maybeOf

Actions.maybeFind

Actions.maybeInvoke

AnimatedList.maybeOf