AngularFire2 typings: “Property 'take' does not exist on type 'FirebaseObjectObservable<any>'”

问题

I've updated my ionic app from beta 11 to rc0. So it means I've switched from typescript 1.8 to 2.

I've configured AngularFire2 according to this site Getting Started with Ionic 2 RC0, Firebase 3 + AngularFire 2

I had this line of code working:

this.af.database.object(`comments/${commentId}`).take(1).subscribe({
    data => console.log(data)
});

But now getting this error

error TS2339: Property 'take' does not exist on type 'FirebaseObjectObservable'.

Any ideas on what's going on? How can I solve this?

回答1:

For more recents versions of rxjs (v6) and angularfire (v5), the syntax I used is :

import { take } from 'rxjs/operators'

...

this.afAuth.authState.pipe(take(1)).subscribe(user => {
  ...
})

回答2:

Posting user @codedesignr's answer from above so this question can have an official solution:

Import the rxjs take operator using: import 'rxjs/add/operator/take';

回答3:

If your angular version is 6 and above.

use below:

import { take, map } from "rxjs/operators";

Install - npm install --save rxjs-compat

Also user pipe with other functions(Take, Map).

timer(0, 10) .pipe(take(1000)) .pipe(map(() => x));

来源：https://stackoverflow.com/questions/39808394/angularfire2-typings-property-take-does-not-exist-on-type-firebaseobjectobs