Cannot find module 'rxjs/subject/BehaviorSubject'

Question

I am using Angular 2.

When I use either of these two, my program runs well:

import { BehaviorSubject } from 'rxjs/Rx';
import { BehaviorSubject } from 'rxjs';

However, I try to use the following way:

import { BehaviorSubject } from 'rxjs/subject/BehaviorSubject';

But I failed, my browser console shows:

Uncaught Error: Cannot find module 'rxjs/subject/BehaviorSubject'

How can I use third way correctly? Thanks

Could you provide the way you configure rxjs in your main HTML file? Thanks! — Thierry Templier, Apr 18 '16 at 17:59
@ThierryTemplier haha, same again. Actually I am using angular2-meteor, so I don't have those stuff.. — Hongbo Miao, Apr 18 '16 at 18:01
I have a look at the rxjs source (`Rx.js`) and I can see the module registration: `System.register("rxjs/subject/BehaviorSubject", ...`. Any hints about the used version? ;-) — Thierry Templier, Apr 18 '16 at 18:02
@ThierryTemplier oh, I don't know where to check my RxJS exact version.. I only know it is RxJS 5.. — Hongbo Miao, Apr 18 '16 at 18:05

Günter Zöchbauer · Accepted Answer · 2018-07-21T06:24:19.013

83

import {BehaviorSubject} from 'rxjs/BehaviorSubject';

rxjs 6.x

import {BehaviorSubject} from 'rxjs';

See also

edited Jul 21 '18 at 06:24

answered Apr 18 '16 at 17:55

Thanks, but now it shows: `ORIGINAL EXCEPTION: ReferenceError: BehaviorSubject is not defined`, actually I am quite confused now which way is recommended now.. – Hongbo Miao Apr 18 '16 at 17:59
One more question. Is it because the new beta version, so the import way changed? thanks – Hongbo Miao Apr 18 '16 at 18:08
What was the last version you used? I'm not aware of related changes but it would be easy to check. – Günter Zöchbauer Apr 18 '16 at 18:10
I think it is Angular2 beta 12, RxJS 5 (but not sure which beta version). – Hongbo Miao Apr 18 '16 at 18:11
I'll check a bit later, have to leave for now. – Günter Zöchbauer Apr 18 '16 at 18:12
Works the same for me in beta.12 – Günter Zöchbauer Apr 19 '16 at 09:52
If you are here because you are trying to use @angular/flex-layout and got errors about BehaviorSubject, try installing @angular/flex-layout@6.0.0-beta.15. Worked for me. – Eric Nelson May 25 '18 at 16:09
rxjs 6.x looks like `import {BehaviorSubject} from 'rxjs/internal/BehaviorSubject';` This is where it's invaluable to have an IDE like WebStorm/PHPStorm - autocomplete so you can discover import paths like that. – ryanm Jul 20 '18 at 22:23
1

rxjs 6.x looks like `import {BehaviorSubject} from 'rxjs';`, more details at https://stackoverflow.com/a/49665105/3232832 – ryanm Jul 20 '18 at 22:38

1 Answers1