Modular Auth with compat AuthGuards throws R3InjectorError (NullInjectorError: No provider for InjectionToken angularfire2.app.options!)

Explanation of the problem

import { provideFirebaseApp, initializeApp, getApp } from '@angular/fire/app';
import {
  initializeAuth,
  provideAuth,
  browserPopupRedirectResolver,
  indexedDBLocalPersistence,
  connectAuthEmulator,
} from '@angular/fire/auth';

@NgModule({
...
imports: [
    provideFirebaseApp(() => initializeApp(environment.firebase)),
    provideAuth(() => {
      const auth = initializeAuth(getApp(), {
        persistence: indexedDBLocalPersistence,
        popupRedirectResolver: browserPopupRedirectResolver,
      });
      if (environment.emulator) {
        connectAuthEmulator(auth, 'http://localhost:9099', {
          disableWarnings: true,
        });
      }
      return auth;
    })
...
],
...

import {
  redirectLoggedInTo,
  canActivate,
} from '@angular/fire/compat/auth-guard';

const redirectToDashboard = () => {
  return redirectLoggedInTo('dashboard');
};

const routes: Routes = [
  {
    path: '',
    component: LandingPageComponent,
    ...canActivate(redirectToDashboard),
    data: { animation: 'Sign in' },
  }
];

@NgModule({
  imports: [RouterModule.forRoot(routes, { relativeLinkResolution: 'legacy' })],
  exports: [RouterModule],
})
export class AppRoutingModule {}

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Problem solution for error Modular Auth with compat AuthGuards throws R3InjectorError

Other popular problems when working with AngularFireAuth in Angular

Problem: “Firebase is not defined” error.

One of the most common problems that Angular developers face while using AngularFire is the “Firebase is not defined” error. This occurs when the Angular app is not able to find the Firebase library that it needs to connect to Firebase services. The error can occur due to a variety of reasons, such as incorrect configuration, missing dependencies, or issues with the Firebase SDK.

Solution:

To fix this issue, developers should ensure that the Firebase library is properly configured in their Angular app. This includes importing the AngularFire module, initializing it with the Firebase credentials, and ensuring that the Firebase SDK is properly installed as a dependency. Here’s an example of how to import and initialize the AngularFire module:

import { AngularFireModule } from '@angular/fire';
import { environment } from '../environments/environment';

@NgModule({
  imports: [
    AngularFireModule.initializeApp(environment.firebase)
  ],
  ...
})
export class AppModule { }

Problem: “Cannot find name ‘auth'” error

Another common issue with AngularFire is the “Cannot find name ‘auth'” error. This error occurs when the app is not able to find the necessary Firebase authentication objects, such as auth or User.

Solution:

To resolve this issue, developers should ensure that they are importing the correct Firebase authentication objects in their Angular components. This can be done using the following import statements:

import { AngularFireAuth } from '@angular/fire/auth';
import firebase from 'firebase/app';

...
constructor(private afAuth: AngularFireAuth) {}

...

this.afAuth.signInWithPopup(new firebase.auth.GoogleAuthProvider());

Problem: “FirebaseError: Firebase: No Firebase App ‘[DEFAULT]'” error.

This error occurs when an Angular app is not able to establish a connection to the Firebase database. This can happen due to incorrect configuration, network issues, or other problems with the Firebase SDK.

Solution: To fix this issue, developers should ensure that the AngularFire module is initialized with the correct Firebase credentials, and that the Firebase SDK is properly installed and configured as a dependency. Here’s an example of how to initialize the AngularFire module:

import { AngularFireModule } from '@angular/fire';
import { environment } from '../environments/environment';

@NgModule({
  imports: [
    AngularFireModule.initializeApp(environment.firebase)
  ],
  ...
})
export class AppModule { }

A brief introduction to Remix-run React Router

AngularFire is a library for building Angular applications that use Firebase services. It provides a set of Angular services and components that simplify the process of interacting with Firebase services, such as the Realtime Database, Cloud Firestore, and Authentication. AngularFire is designed to integrate seamlessly with Angular, providing a set of observables that can be used to manage data and synchronize it with Firebase.

One of the key benefits of AngularFire is that it provides a consistent and easy-to-use API for working with Firebase services. AngularFire abstracts away much of the complexity of working with Firebase, providing a set of high-level services and components that can be used to build complex applications. Additionally, AngularFire integrates seamlessly with Angular’s change detection system, providing a reactive programming model that simplifies the process of managing data and updates. Overall, AngularFire simplifies the process of building complex Angular applications that use Firebase services, providing a set of tools and APIs that make it easier to build scalable and reliable applications.

AngularFire is built on top of Firebase, a cloud-based platform for building mobile and web applications. Firebase provides a set of tools and services for building scalable and reliable applications, including Realtime Database, Cloud Firestore, Authentication, Cloud Functions, and Cloud Storage. Firebase is designed to make it easy to build real-time applications that can scale to millions of users, providing a set of high-level APIs and SDKs that simplify the process of working with complex data and workflows. Overall, Firebase provides a powerful and flexible platform for building modern applications, while AngularFire provides a set of Angular-specific tools and APIs that make it easier to integrate Firebase into Angular applications.

Most popular use cases for Remix-run React Router

AngularFire can be used to create real-time, reactive web applications with Angular and Firebase. It provides an Angular-specific wrapper around the Firebase SDK, allowing developers to easily integrate Firebase into their Angular applications without worrying about manual setup and configuration. AngularFire supports real-time data synchronization and authentication, allowing developers to easily build reactive applications that update in real-time as data changes.

One common use case for AngularFire is real-time data synchronization. Using AngularFire, developers can easily bind their Angular templates to Firebase collections, allowing them to automatically update as data changes. For example, the following code block demonstrates how to use AngularFire to bind an Angular template to a Firebase collection:

@Component({
  selector: 'app-users',
  template: `
    <ul>
      <li *ngFor="let user of users | async">{{ user.name }}</li>
    </ul>
  `
})
export class UsersComponent implements OnInit {
  users: Observable<any[]>;

  constructor(private db: AngularFirestore) {}

  ngOnInit() {
    this.users = this.db.collection('users').valueChanges();
  }
}

@Component({
  selector: 'app-login',
  template: `
    <form (submit)="login()">
      <input type="email" [(ngModel)]="email" name="email" placeholder="Email">
      <input type="password" [(ngModel)]="password" name="password" placeholder="Password">
      <button type="submit">Login</button>
    </form>
  `
})
export class LoginComponent {
  email: string;
  password: string;

  constructor(private afAuth: AngularFireAuth) {}

  async login() {
    try {
      await this.afAuth.signInWithEmailAndPassword(this.email, this.password);
    } catch (e) {
      console.log(e);
    }
  }
}