Error in AngularFire2 typings: The property 'take' is not present in the type 'FirebaseObjectObservable<any>'

Recently, I upgraded my ionic app from beta 11 to rc0, which also involved transitioning from typescript 1.8 to version 2.

After following the configuration steps for AngularFire2 on the site Getting Started with Ionic 2 RC0, Firebase 3 + AngularFire 2, I found that a previously functioning line of code now throws an error:

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

The error message reads: Property 'take' does not exist on type 'FirebaseObjectObservable'. Any suggestions on how to troubleshoot and resolve this issue?

angulartypescriptfirebaseionic2angularfire2

Answer №1

In the latest versions of rxjs (v6) and angularfire (v5), the syntax I employed is as follows:

import { take } from 'rxjs/operators'

...

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

Answer №2

@codedesignr's helpful response has been included here for the benefit of everyone:

To make use of the rxjs take operator, remember to import it like so: import 'rxjs/add/operator/take';

Answer №3

Using the authentication state, this code subscribes to the user details and processes them once.

Processing of user details happens inside the subscribe method.

Answer №4

If you are utilizing Angular version 6 or higher.

Follow the instructions below:

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

To install, run - npm install --save rxjs-compat

Make sure to use pipe along with other functions(Take, Map).

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

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