`typedef` support for enums

[sikrinick]

Versions

dart_mappable: 4.6.1
dart_mappable_builder: 4.6.1

Description

At least in case, when using typedef to enum from another module, mapper.dart files rely on original enum, instead of a typedef.
This results in a Error: Type 'OriginalEnum' not found. file.mapper.dart:259 OriginalEnumType

Example

Let's assume we have pub workspaces with 2 modules: module_a and module_b.

module_a contains next files:

1. validation_result.dart

@MappableEnum
enum ValidationResult {
  valid, incorrectFormat, tooShort,
}

2. amount_validation_result.dart

import 'package:module_a/validation_result.dart';

typedef AmountValidationResult = ValidationResult

module_b contains next file:

1. bloc_state.dart

import 'package:module_a/amount_validation_result.dart';

part 'bloc_state.mapper.dart';

@MappableClass
class BlocState {
  BlocState({required this.amountValidationResult}
  final AmountValidationResult amountValidationResult
}

If we run dart run build_runner build -d in module_a and then in module_b, nothing will fail.
But if we try to build the app, compiler will return:

packages/module_b/bloc_state.mapper.dart:259:5: Error: Type 'ValidationResult' not found.
ValidationResult
^^^^^^^^^^^^^^^

[sikrinick]

Proposal for a fix: #325