Fix Subscriptions in playground

package.json

@@ -36,6 +36,7 @@
     "reflect-metadata": "^0.1.13",
     "rimraf": "^3.0.2",
     "rxjs": "^7.2.0",
+    "subscriptions-transport-ws": "^0.9.19",
     "uuid": "^8.3.2"
   },
   "devDependencies": {

src/app.module.ts

@@ -15,9 +15,9 @@ import { WebAuthGuard } from './auth/web-auth.guard';
         GraphQLModule.forRoot({
             autoSchemaFile: true,
             playground: true,
-            installSubscriptionHandlers: true,
             subscriptions: {
                 'graphql-ws': true,
+                'subscriptions-transport-ws': true,
             },
             context: (ctx) => ({
                 req: ctx.request || ctx.req,

src/resolvers/group.resolver.ts

@@ -12,18 +12,22 @@ import { Group } from './models/group.model';
 import { PrismaService } from '../prisma/prisma.service';
 import { GraphQLString } from 'graphql';
 import * as seedWords from 'mnemonic-words';
-import { ForbiddenException, NotFoundException, UnauthorizedException, UseGuards } from '@nestjs/common';
+import {
+    ForbiddenException,
+    NotFoundException,
+    UnauthorizedException,
+    UseGuards,
+} from '@nestjs/common';
 import { GroupAuthGuard } from '../auth/group-auth.guard';
 import { Request } from 'express';
 import { pubSub } from '../pubSub.instance';
-import { AgentAuthGuard } from 'src/auth/agent-auth.guard';
 
 @Resolver(() => Group)
 export class GroupResolver {
     constructor(private prismaService: PrismaService) {}
 
     @Subscription(() => Group, {
-        filter: (payload, variables, state) =>
+        filter: (payload, variables) =>
             payload.updateToken.code === variables.groupCode,
     })
     async updateToken(
@@ -45,7 +49,8 @@ export class GroupResolver {
 
     @Mutation(() => Group)
     async addToken(
-        @Args({ name: 'groupSlug', type: () => GraphQLString }) groupSlug: string,
+        @Args({ name: 'groupSlug', type: () => GraphQLString })
+        groupSlug: string,
     ) {
         const group = await this.prismaService.group.update({
             where: {