IMap.fromJson does not support custom types for keys

[urusaich]

map_point.dart

import 'dart:math';

typedef MapPoint = Point<int>;

class MapPointJsonConverter extends JsonConverter<MapPoint, String> {
  const MapPointJsonConverter();

  @override
  MapPoint fromJson(String json) => parseMapPoint(json);

  @override
  String toJson(MapPoint object) => '${object.x}x${object.y}';
}

entity.dart

import 'package:json_serializable/json_serializable.dart';
import 'package:fast_immutable_collections/fast_immutable_collections.dart';

part 'entity.g.dart';

@JsonSerializable(converters: [MapPointJsonConverter()])
class Entity {
  const Entity({required this.map});

  factory Entity.fromJson(Map<String, dynamic> json) => _$EntityFromJson(json);

  final IMap<MapPoint, int> map;
}

entity.g.dart

Entity _$EntityFromJson(Map<String, dynamic> json) =>
    Entity(
      map: json['map'] == null
          ? const IMap.empty()
          : IMap<Point<int>, int>.fromJson(
              json['map'] as Map<String, dynamic>,
              (value) =>
                  const MapPointJsonConverter().fromJson(value as String),
              (value) => (value as num).toInt(),
    );

error

Unhandled Exception: Unsupported operation: 
JSON deserialization of IMap keys of type Point<int> are not supported at the moment.

stack trace

#0 _safeKeyFromJson (package:fast_immutable_collections/src/imap/imap.dart:1558:5)
#1 new IMap.fromJson.<anonymous closure> (package:fast_immutable_collections/src/imap/imap.dart:498:50)
#2 MapBase.map (dart:collection/maps.dart:82:28)
#3 new IMap.fromJson (package:fast_immutable_collections/src/imap/imap.dart:497:12)

[marcglasberg]

Related to:

https://github.com/marcglasberg/fast_immutable_collections/issues/39 https://github.com/marcglasberg/fast_immutable_collections/issues/58