Empty subscribe on valueChanges in Angular2

Question

I have this weird case, a subscribe that never fires if left empty.

This doesn't work:

this.formGroup.get('unitCount').valueChanges
.do(value => console.log(value))
.subscribe();

When this works fine:

this.formGroup.get('unitCount').valueChanges
.do(value => console.log(value))
.subscribe(() => true);

Here I used () => true, but it could anything, false, void 0, even an empty object {}

Why can't I leave the subscribe() empty?

Possible duplicate of [RXJS 5 .subscribe() without arguments](https://stackoverflow.com/questions/42333187/rxjs-5-subscribe-without-arguments) — Andrei Matracaru, Aug 10 '17 at 08:38

score 1 · Accepted Answer · answered Aug 10 '17 at 08:55

1

You probably have a older version of RxJS 5. This was a bug but is already fixed.

I can't find since what version it works correctly, but this PR could be related to this: https://github.com/ReactiveX/rxjs/pull/1935

Otherwise, show what exact RxJS version you're using.

answered Aug 10 '17 at 08:55

martin

2

Problem solved, I updated from rxjs@5.0.1 to rxjs@5.4.2 – Damian Hercun Aug 10 '17 at 08:56

1 Answers1