rxjs5 - no WebSocket constructor can be found

I'm trying to do something basic, but it's completely eluding me. I'm trying to create an Observable from rxjx/observable/dom/webSocket in RxJS5, but I'm not using typescript, or es6 modules... just plain 'ole good commonJS. I've managed to patch the Observable properly according to the docs, but whenever I try to pass in the string expected for the subject, I get the error:

no WebSocket constructor can be found, [source].

I haven't had time to dig into TypeScript yet, but from what I can tell, I've satisfied the conditions of the constructor, and I've also taken a look at the test spec, and they use the function in the same way Observable.webSocket('ws://host:port'); I'm trying to, but I still get an error.

I've tried:

var Rx = require('rxjs/Rx');
require('rxjs/Rx.dom').webSocketSubject; //also tried just using `.webSocket`

var source = Rx.Observable.webSocket('ws://localhost:53311');

source.subscribe();

I've also tried passing an object to Rx.Observable.webSocket:

var source = Rx.Observable.webSocket({
  url: 'ws://host:port'
});

Can anyone help me figure out how to use the webSocket Observable that's available via rxjs5, when consuming from commonJS? (node v5.11)

Solution

This isn't about TypeScript, you may need provide constructor to websocket to WebSocketSubject.

In test case, https://github.com/ReactiveX/rxjs/blob/fd0823b99db92d1e214052ad506904b0d744d494/spec/observables/dom/webSocket-spec.ts#L14 specifies it in root to globally override websocket, while it's also possible to provide it as config object like

var ws = require('websocket');

socket = new WebSocketSubject({
  url: 'ws://....',
  WebSocketCtor: ws.w3cwebsocket
});

Even required in TypeScript or ES15 RxJS module as well.