`Rx.Observable.from` does not properly handle `NodeList`

Consider the following code:

const buttons = document.querySelectorAll('.btn');

const button$ = Rx.Observable.from(buttons);
const button2$ = Rx.Observable.from(buttons);

button$.subscribe(x => console.log('observer 1 ', x)); // emit
button$.subscribe(x => console.log('observer 2 ', x)); // nothing
button2$.subscribe(x => console.log('observer 3 ', x)); // emit

Rx.Observable.from should result in a cold observable that emit the same list each time it is subscribed. However, in this example the source is a NodeList and the second subscription does not emit.

[Dorus]

@cartant Yes i did know that, but thanks for the suggestion anyway. It’s exactly what i suggested @mocheng on gitter 3 november 2017 12:14 as he’s the one that came up with this scenario.

@kwonoj No prob about the confusion, at least it kept the issue active and quickly resolved 😃

[cartant]

@Dorus You most likely already know this, but you can work around the problem in version 5 using defer:

const button$ = Rx.Observable.defer(() => Rx.Observable.from(buttons));