Dart APIunself_componentUnAppPagename name property Null safety Widget name final Implementation final Widget name; unself_component unself_component UnAppPage name property UnAppPage class Constructors UnAppPage Properties description hashCode implyLeading isImmersive key leading name runtimeType slivers trailing Methods build createElement debugDescribeChildren debugFillProperties noSuchMethod toDiagnosticsNode toString toStringDeep toStringShallow toStringShort Operators operator ==