Extra Dart code

Arbitrary extra Dart code can be inserted into auto-generated Dart classes, by using the #[frb(dart_code = ...)] syntax.

In order to import things, simply write down the import statements besides normal code, and it will be automatically recognized and pasted.

Example

#[frb(dart_code = "
    int extraMethod() => a * 2;
"
)]
pub struct MyStruct {
    ...
}

Then the generated Dart class will look like:

class MyStruct {
  ... // other auto-generated code
  
  int extraMethod() => a * 2; // The extra code
}