Add TypeChecker like typeNamed that accepts a String

[Rexios80]

TypeChecker.typeNamed takes a Type object but only relies on its toString value. I need to build TypeCheckers for packages that aren’t project dependencies, so having a variant that accepts a type name as a String would be far more practical. I’ve implemented a workaround class, but this really should be supported natively.

The workaround:

/// Create a Type class who's toString() method returns the name
///
/// Workaround for TypeChecker.typeNamed() not accepting a String.
class TypeNamed implements Type {
  /// The name of the type
  final String name;

  /// Constructor
  const TypeNamed(this.name);

  @override
  String toString() => name;
}

[davidmorgan]

Makes sense, thanks!

Looking at the current implementation it's a bit weird, it keeps a Type and only converts to a String later, but that's because of the requirement to be const for backwards compatibility. I guess just adding a new type checker class is simplest.

https://github.com/dart-lang/source_gen/blob/master/source_gen/lib/src/type_checker.dart

I'll add it to my TODO list but it's not super high priority, you're welcome to send a PR also :)

[davidmorgan]

Never mind "not super high priority", I sent a PR after all :)

[davidmorgan]

Released as 4.1.0 :)