Completion message parsing error 'NoSuchMethodError'

[jamiewest]

Completion message parsing error 'NoSuchMethodError'

[Mol0ko]

Useful line of error log:

E/flutter (12538): #0      WebSocketTransport.connect.<anonymous closure> 
package:signalr_core/…/transports/web_socket_transport.dart:79

After debugging this I found the cause of an error. It throws from this line:

signalr_core/lib/src/json_hub_protocol.dart

Line 164 in b4e1bed

if ((message.result != null) && message.error.isNotEmpty) {

I think the first if operator of method _isCompletionMessage is useless as the second (with _assertNotEmptyString) do the same. _isCompletionMessage could be like that:

  void _isCompletionMessage(CompletionMessage message) {
    if ((message.result == null) && (message.error != null)) {
      _assertNotEmptyString(
          message.error, 'Invalid payload for Completion message.');
    }

    _assertNotEmptyString(
        message.invocationId, 'Invalid payload for Completion message.');
  }

In this case the error is gone.