update websocket

src/Graphql/graphql.module.ts

@@ -41,6 +41,7 @@ import { WorkshopSubscriptionModule } from '../WorkshopSubscription/workshopsubs
 import { initContextCache } from '@pothos/core'
 import { PubSub } from 'graphql-subscriptions'
 import { isSubscription } from 'rxjs/internal/Subscription'
+import { EventEmitter } from 'ws'
 
 @Global()
 @Module({
@@ -147,7 +148,10 @@ import { isSubscription } from 'rxjs/internal/Subscription'
     },
     {
       provide: 'PUB_SUB',
-      useFactory: () => new PubSub(),
+      useFactory: () =>
+        new PubSub({
+          eventEmitter: new EventEmitter({}),
+        }),
     },
   ],
   exports: [