How to use the opennms.API.OnmsServer function in opennms

this.timeout = parseInt(settings.jsonData.timeout,10) * 1000;
        }

        let authConfig = undefined;
        if (settings.basicAuth) {
          // If basic auth is configured, pass the username and password to the client
          // This allows the datasource to work in direct mode
          // We need the raw username and password, so we decode the token
          const token = settings.basicAuth.split(' ')[1];
          const decodedToken = atob(token);
          const username = decodedToken.split(':')[0];
          const password = decodedToken.substring(username.length+1, decodedToken.length);
          authConfig = new API.OnmsAuthConfig(username, password);
        }

        const server = API.OnmsServer.newBuilder(this.url).setName(this.name).setAuth(authConfig).build();
        const http = new Rest.GrafanaHTTP(this.backendSrv, server, this.timeout);
        this.client = new Client(http);
        this.clientWithMetadata = undefined;
     }