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Interceptors

There is no difference between regular interceptors and web sockets interceptors. The following example uses a manually instantiated method-scoped interceptor. Just as with HTTP based applications, you can also use gateway-scoped interceptors (i.e., prefix the gateway class with a @UseInterceptors() decorator).

@UseInterceptors(new TransformInterceptor())
@SubscribeMessage('events')
handleEvent(client: Client, data: unknown): WsResponse<unknown> {
  const event = 'events';
  return { event, data };
}

@UseInterceptors(new TransformInterceptor())
@SubscribeMessage('events')
handleEvent(client, data) {
  const event = 'events';
  return { event, data };
}