The data type '{}' cannot be assigned to the data type 'Profile'

I recently started using TypeScript and encountered this error:

Type '{}' is not assignable to type 'Profile'.

within the context of this.profile. Can anyone suggest a solution?

import { Component } from '@angular/core';
import { IonicPage, NavController, NavParams } from 'ionic-angular';
import { AngularFireAuth } from 'angularfire2/auth';
import { AngularFirestore } from 'angularfire2/firestore';
import { Profile } from './../../models/profile';


@IonicPage()
@Component({
  selector: 'page-profile',
  templateUrl: 'profile.html',
})
export class ProfilePage {

    profile = {} as Profile;

    constructor(private afs: AngularFirestore, private afAuth: AngularFireAuth,
      public navCtrl: NavController, public navParams: NavParams) {
    }
    ionViewWillLoad() {
      this.afAuth.authState.take(1).subscribe(data => {
          let profileCollection = this.afs.collection('profiles').doc(`${data.uid}`).valueChanges();
          profileCollection.subscribe(profile => this.profile = profile);
      })
    }
  }

Answer №1

The issue lies in the fact that your Profile type likely has required properties. You have two options: either make these properties optional or initialize them with default values. It is not possible to assign an empty object to a type that includes mandatory properties.

Another approach is to simply declare profile: Profile without initializing it. This way, you still enforce the type without needing to assign an empty object using {}. Since you only assign a value inside the subscribe function, this workaround should suffice.

Answer №2

The error message "Type '{}' is not assignable to type 'Profile'." indicates a type mismatch.

If you encounter this issue and want to make such an assertion, you should follow the double assertion pattern as shown below:

profile = {} as any as Profile;

Learn More

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