Inject() must be called from an injection context such as a constructor in AngularFirestoreDoc after upgrading to Angular v19

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
45/100
Issue type
Bug
Clarity
Needs clarification
Activity status
Quiet
Tech stack
angular, firebase, typescript
Domain
backend, databases

Research direction

Start with the call in auth.service.ts at line 38 and trace it through AngularFirestore.doc into angular-fire-compat-firestore.mjs, using the NG0203 stack trace as the entry point. Compare the reported Angular v19 and @angular/fire v19 dependency versions and review the issue discussion for an established reproduction or resolution. Done means the injection-context error is explained and a verified compatibility fix or maintainer-confirmed next step is identified.

Written by the indexing model from the issue text.

Description

comp: compat needs: investigation type: bug version: current (v17+)

I recently upgraded all dependencies to Angular v19 (from v18). I was previously on Angular v18 where everything worked fine. However, now, my whole console is spammed with the following error:

ERROR RuntimeError: NG0203: inject() must be called from an injection context such as a constructor, a factory function, a field initializer, or a function used with `runInInjectionContext`. Find more at https://angular.dev/errors/NG0203
    at injectInjectorOnly (core.mjs:1104:11)
    at ɵɵinject (core.mjs:1114:40)
    at inject (core.mjs:1199:10)
    at <instance_members_initializer> (angular-fire-compat-firestore.mjs:93:14)
    at new AngularFirestoreDocument (angular-fire-compat-firestore.mjs:98:3)
    at _AngularFirestore.doc (angular-fire-compat-firestore.mjs:621:12)
    at auth.service.ts:38:14
    at switchMap.js:16:17
    at OperatorSubscriber2._this._next (OperatorSubscriber.js:14:9)
    at Subscriber2.next (Subscriber.js:32:12)

However, my auth service at line 38:14 only has the following code:
.doc<User>(`users/${user.uid}`)

The whole constructor looks like this (it is a angular service class)

  providedIn: 'root',
})
export class AuthService {
  isLoggedIn$: Observable<boolean>;
  /** User data of database */
  user$: Observable<User | null | undefined>;
  userRoles$: Observable<string[]>;
  userId: string | undefined = undefined;
  username: string | undefined = undefined;

  constructor(
    readonly firestore: AngularFirestore,
    readonly fireAuth: AngularFireAuth,
    readonly router: Router,
  ) {
    this.user$ = this.fireAuth.authState.pipe(
      switchMap((user) => {
        if (user) {
          this.userId = user.uid;
          return this.firestore
            .doc<User>(`users/${user.uid}`)
            .valueChanges()
            .pipe(
              map((userData) => {
                if (userData) {
                  this.username = userData.username; // Assign username
                }
                return userData;
              }),
            );
        } else {
          this.userId = undefined;
          this.username = undefined;
          return new Observable<User | null>((observer) => observer.next(null));
        }
      }),
    );

But I dont really know, why it does not work anymore in angular 19.

My package dependencies:

 "dependencies": {
    "@angular/animations": "^19.1.5",
    "@angular/cdk": "^19.1.3",
    "@angular/common": "^19.1.5",
    "@angular/compiler": "^19.1.5",
    "@angular/core": "^19.1.5",
    "@angular/fire": "^19.0.0",
    "@angular/forms": "^19.1.5",
    "@angular/material": "^19.1.3",
    "@angular/platform-browser": "^19.1.5",
    "@angular/platform-browser-dynamic": "^19.1.5",
    "@angular/router": "^19.1.5",
    "@fortawesome/angular-fontawesome": "^1.0.0",
    "@fortawesome/free-brands-svg-icons": "^6.7.1",
    "@fortawesome/free-regular-svg-icons": "^6.7.1",
    "@fortawesome/free-solid-svg-icons": "^6.7.1",
    "@ng-select/ng-select": "^14.2.2",
    "@ngx-translate/core": "^15.0.0",
    "@ngx-translate/http-loader": "^8.0.0",
    "angular-build-info": "^2.0.1",
    "canvas-confetti": "^1.9.3",
    "flowbite": "^2.5.2",
    "ng-recaptcha-2": "^15.0.2",
    "ngx-editor": "^18.0.0",
    "ngx-quill": "^27.0.0",
    "quill": "^2.0.3",
    "quill2-emoji": "^0.1.2",
    "rxjs": "~7.8.0",
    "tslib": "^2.8.1",
    "tw-elements": "^2.0.0",
    "zone.js": "^0.15.0"
  },

I also tried to set "preserveSymlinks": false, in angular.json however, the issue still persists.

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