dartstruct

An annotation processor inspired by mapstruct for generating type-safe mappers

What is dartstruct?

dartstruct is a Dart annotation processor, inspired by Java MapStruct, for the generation of type-safe and performant mappers for dart classes. It saves you from writing mapping code by hand, which is a tedious and error-prone task.

dartstruct offers the following advantages:

• Fast execution by using plain method invocations
• Compile-time type safety. Only objects and attributes mapping to each other can be mapped, so there's no accidental mapping.
• Self-contained code: no runtime dependencies
• Clear error reports at build time if:
  • mappings are incomplete (not all target properties are mapped)
  • mappings are incorrect (cannot find a proper mapping method or type conversion)
  • Easily debuggable mapping code (or editable by hand—e.g. in case of a bug in the generator)

To create a mapping between two types, declare a mapper class like this:

@Mapper()
abstract class CarMapper {

    static CarMapper get INSTANCE => CarMapperImpl();

    CarDto carToCarDto(Car car);

}

The generated implementation uses plain Dart method invocations for mapping between source and target objects. Properties are mapped if they have the same name in source and target.

Using dartstruct

Add the generator to your dev dependencies

dependencies:
  dartstruct: any

dev_dependencies:
  dartstruct_generator: any
  build_runner: any

then run generator

pub run build_runner build  # Dart SDK
flutter pub run build_runner build # Flutter SDK