fix(NA): removed useless addGraphQLWS function.

src/helpers.ts

@@ -1,5 +1,4 @@
-import { SubscriptionClient, ClientOptions } from './client';
-import { ExecutionResult } from 'graphql';
+import { SubscriptionClient } from './client';
 
 /**
  * @deprecated This method will become deprecated in the new package graphql-transport-ws.
@@ -21,16 +20,3 @@ export function addGraphQLSubscriptions(networkInterface: any, wsClient: Subscri
     },
   });
 }
-
-export function addGraphQLWS(networkInterface: any, wsClientOptions: ClientOptions): any {
-  if (typeof networkInterface._uri !== 'string') {
-    throw new Error('Given networkInterface should have an uri defined to config the websocket.');
-  }
-
-  const wsClient = new SubscriptionClient(networkInterface._uri, wsClientOptions);
-  return Object.assign(addGraphQLSubscriptions(networkInterface, wsClient), {
-    query(request: any): Promise<ExecutionResult> {
-      return wsClient.query(request);
-    },
-  });
-}