WidgetsLocalizations constructor Null safety

1. Flutter
2. widgets
3. WidgetsLocalizations
4. WidgetsLocalizations constructor

WidgetsLocalizations class

1. Constructors
2. WidgetsLocalizations
3. Properties
4. hashCode
5. runtimeType
6. textDirection
7. Methods
8. noSuchMethod
9. toString
10. Operators
11. operator ==
12. Static methods
13. of