decodeMethodCall method Null safety

Implementation

@override
MethodCall decodeMethodCall(ByteData? methodCall) {
  final Object? decoded = const JSONMessageCodec().decodeMessage(methodCall);
  if (decoded is! Map) {
    throw FormatException('Expected method call Map, got $decoded');
  }
  final Object? method = decoded['method'];
  final Object? arguments = decoded['args'];
  if (method is String) {
    return MethodCall(method, arguments);
  }
  throw FormatException('Invalid method call: $decoded');
}