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This pull request allows
NavigatorStatemethods to benefit from@protected, without needing to add@protectedanywhere!mini-design doc: flutter.dev/go/implicitly-protected
Before
After
(the result after this PR and #157873 are merged)
This is possible thanks to Dart's extension types feature.
NavigatorState(originally spanning over 2,000 lines of code) has been split into an "internal" and "external" type.The extension type wrapper exposes
State<Navigator>instead of the concrete implementation. Static analysis is now performed against the baseStateclass, so whether the overridden methods are@protecteddoesn't matter!