Make it possible to augment constructor initializer in FieldDefinitionMacro

[AlexanderFarkas]

To clarify, I refer specifically to FieldDefinitionMacros. I believe it's already possible to augment constructor initializers in ClassDefinitionMacro.

Now we can augment field initializer (though not implemented yet)

builder.augment(
  initializer: ExpressionCode.fromParts([
    observableListClazz,
    "(augmented)",
  ]),
);

I think it's reasonable to allow augmenting constructor initializer for this field:

builder.augment(
  constructorInitializer: ExpressionCode.fromParts([
    observableListClazz,
    "(augmented)",
  ]),
);

Or may be just duplicate initializer's ExpressionCode to constructor if field doesn't have initializer.

Before:

class MyClass {
  @observable
  final List<String> names;
  MyClass(this.name);
}

After:

augment class MyClass {
  augment MyClass(List<String> names): this.names = generatedCodeByMacro(augmented)
}

[dart-github-bot]

Summary: The user proposes adding the ability to augment constructor initializers in FieldDefinitionMacro, similar to the existing functionality in ClassDefinitionMacro. This would allow overriding or duplicating the field initializer's expression code in the constructor.