Using Dart 2.17 Super Initializer for Widget key

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Now that Dart 2.17 allows for the super initializer feature it seems that I can now replace my default boilerplate

class WidgetName extends StatelessWidget {
  const WidgetName({Key? key}) : super(key: key);

with

class WidgetName extends StatelessWidget {
  const WidgetName({super.key});

What are the ramifications of this? I assume this change in code isn't 100% equivalent given the possible nullable value of key in the 'old' syntax vs the 'new'. Or maybe I don't fully comprehend the underlying process of super initialization.

dart flutter
1 Answers

It is 100% equivalent. In both cases key is of type Key?.

You can confirm what the type of key is when you hover over the constructor in your editor.

super initializer tooltip

The type of a super initializer will match what the type is in the super constructor. The super constructor in this case is the default constructor for StatelessWidget which is defined as const StatelessWidget({Key? key}).

user_30808480
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