How to run a code-generator on the top of another code-generator?

Question

Using the source_gen stack to make a code generator, how can I make a generator that generates code that would be the input of another generator (more specifically json_se

Answer 1

You can decode the JSON by calling the jsonDecode() function, with the JSON string as the method argument.

Map user = jsonDecode(jsonString);

print('Howdy, ${user['name']}!');
print('We sent the verification link to ${user['email']}.');

Now, Use the User.fromJson() constructor, for constructing a new User instance from a map structure and a toJson() method, which converts a User instance into a map.

employee.dart

class Employee {
  final String name;
  final String id;

  Employee(this.name, this.id);

  Employee.fromJson(Map json)
      : name = json['name'],
        id = json['id'];

  Map toJson() =>
    {
      'name': name,
      'id': id,
    };
}

json_serializable is an automated source code generator that generates the JSON serialization boilerplate for you.

You need one regular dependency, and two dev dependencies to include json_serializable in your project.

dependencies:
  json_annotation: ^0.2.3

dev_dependencies:
  build_runner: ^0.8.0
  json_serializable: ^0.5.0

For more details on JSON serialization you can refer here

you can also use the Smoke library.

It's a subset of the Mirrors functionality but has both a Mirrors-based and a Codegen-based implementation. It's written by the PolymerDart team, so it's as close to "Official" as we're going to get.

While developing, it'll use the Mirrors-based encoding/decoding; but for publishing you can create a small transformer that will generate code.

Seth Ladd created a code sample here, which I extended slightly to support child-objects: