toJson method

@override Map<String, Object?> toJson()

Wire form with stable key order (zap first — the envelope reads top-down).

Implementation

@override
Map<String, Object?> toJson() => <String, Object?>{
  'zap': zapProtocolVersion,
  'type': type,
  'id': id,
  'ts': ts,
  'code': code,
  'message': message,
  if (inReplyTo != null) 'inReplyTo': inReplyTo,
  if (details != null && details!.isNotEmpty) 'details': details,
};