@loopeco/socketio/src/socketio.application.ts

A enhanced LoopBack's WebSocket server based on socket.io

import {Application, ApplicationConfig, Binding, Constructor, Context, Server} from '@loopback/core';
import {format} from 'util';
import {SocketIoMixin} from './mixins';

export const ERR_NO_MULTI_SERVER = format(
  'SocketApplication does not support multiple servers!',
  'To create your own server bindings, please extend the Application class.',
);

export class SocketIoApplication extends SocketIoMixin(Application) {
  constructor(parent: Context);
  constructor(config?: ApplicationConfig, parent?: Context);
  constructor(configOrParent?: ApplicationConfig | Context, parent?: Context) {
    super(configOrParent, parent);
  }

  // Unfortunately, TypeScript does not allow overriding methods inherited
  // from mapped types. https://github.com/microsoft/TypeScript/issues/38496
  // eslint-disable-next-line @typescript-eslint/ban-ts-comment
  // @ts-ignore
  public server(server: Constructor<Server>, name?: string): Binding {
    if (this.findByTag('server').length > 0) {
      throw new Error(ERR_NO_MULTI_SERVER);
    }
    return super.server(server, name);
  }
}