void instantSync(String name, {Map arguments})

Emit an instant event.

Source 

static void instantSync(String name, {Map arguments}) {
  if (_isProduct) {
    return;
  }
  if (name is! String) {
    throw new ArgumentError.value(name,
                                  'name',
                                  'Must be a String');
  }
  if (!_isDartStreamEnabled()) {
    // Stream is disabled.
    return;
  }
  Map instantArguments;
  if (arguments is Map) {
    instantArguments = new Map.from(arguments);
  }
  _reportInstantEvent(_getTraceClock(),
                      'Dart',
                      name,
                      _argumentsAsJson(instantArguments));
}