buildDefaultThemes function
Implementation
Themes buildDefaultThemes(Brightness? brightness) => Themes(
brightness: brightness ?? Brightness.light,
cardTheme: PlatformCardTheme(),
cupertinoTheme: CupertinoThemeData(),
darkTheme: ThemeData(),
lightTheme: ThemeData(),
themeBuilder: (_, __, ___) => ThemeData(),
visualStyle: CupertinoVisualStyle(),
listTileTheme: ListTileTheme(child: Container()));