public override async Task <Unit> Handle(DidOpenTextDocumentParams notification, CancellationToken cancellationToken)
{
_logger.LogTrace("received open notification {}", notification.TextDocument.Uri);
var document = await _documents.LoadDocumentAsync(notification.TextDocument, cancellationToken);
_diagnosticPublisher.PublishDiagnostics(document, cancellationToken);
return(Unit.Value);
}