fix(*): cors workaround socket adapter (#1127)

src/main.ts

@@ -2,6 +2,20 @@ import { NestFactory } from '@nestjs/core';
 import { AppModule } from './app.module';
 import * as helmet from 'helmet';
 import { LogLevel } from '@nestjs/common';
+import { IoAdapter } from '@nestjs/platform-socket.io';
+import { ServerOptions } from 'socket.io';
+
+/**
+ * https://stackoverflow.com/questions/65957386/cors-error-with-socket-io-connections-on-chrome-v88-and-nestjs-server
+ */
+export class WorkaroundSocketAdapter extends IoAdapter {
+  createIOServer(
+    port: number,
+    options?: ServerOptions & { namespace?: string; server?: any },
+  ) {
+    return super.createIOServer(port, { ...options, cors: true });
+  }
+}
 
 async function bootstrap() {
   let logLevels: LogLevel[];
@@ -16,6 +30,7 @@ async function bootstrap() {
     logger: logLevels,
   });
 
+  app.useWebSocketAdapter(new WorkaroundSocketAdapter(app));
   app.enableCors();
   app.use(helmet());
   app.use(