GraphQLWsMessage.fromJson constructor

GraphQLWsMessage.fromJson(Map map)

Reads a message off the wire.

Throws FormatException for a missing or non-string type, and for an id that is not a string. Unlike the older protocol, an id is a string and nothing else.

Implementation

factory GraphQLWsMessage.fromJson(Map map) {
  final type = map['type'];
  final id = map['id'];

  if (type is! String) {
    throw FormatException('"type" is required and must be a string.');
  }
  if (id != null && id is! String) {
    throw FormatException('"id" must be a string.');
  }

  return GraphQLWsMessage(type, id: id as String?, payload: map['payload']);
}