defaultTextStyleOf null dereference

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defaultTextStyleOf null dereference

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main.dart

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: Center(
          child: CustomButton(
            onPressed: () {},
            child: const Text('Custom button'),
          ),
        ),
      ),
    );
  }
}

class CustomButton extends TextButton {
  const CustomButton({
    super.key,
    required super.onPressed,
    required super.child,
  });

  @override
  ButtonStyle defaultStyleOf(BuildContext context) {
    return TextButton.styleFrom(
      foregroundColor: Colors.teal,
      // ...other custom styles here

      // The following lines are now required to prevent null dereferences:
//       enabledMouseCursor: SystemMouseCursors.click,
//       disabledMouseCursor: SystemMouseCursors.basic,
    ).merge(super.defaultStyleOf(context));
  }
}