WebSocketGateway

To implement your first module using the Nest.js web socket, you will have to use the @WebSocketGateway decorator. This decorator can take an argument as an object to provide a way to configure how to use the adapter.

The implementation of the arguments respect the interface GatewayMetadata, allowing you to provide:

• port, which must be use by the adapter
• namespace, which belongs to the handlers
• middlewares that have to be applied on the gateway before accessing the handlers

All the parameters are optional.

To use it, you have to create you first gateway class, so imagine a UserGateway:

@WebSocketGateway({
    middlewares: [AuthenticationGatewayMiddleware]
})  
export class UserGateway { /*....*/ }

By default, without any parameters, the socket will use the same port as your express server (generally 3000). As you can see, in the previous example we used a @WebSocketGateway, which uses the default port 3000 without namespace and with one middleware that we will see...