JWT library error: Generic type 'ModuleWithProviders<T>' requires 1 type argument(s) in Angular 10 - node.js

Question

For an authentication project I am using:
Angular CLI: 11.0.4 for the frontend
Node: 10.19.0 for the backend
OS: linux x64
I receive the following error after ng serve and I am not sure why that is happening, the error seems to be in the library node_modules/angular2-jwt/angular2-jwt.d.ts and not in the code I wrote:
node_modules/angular2-jwt/angular2-jwt.d.ts:88:41 - error TS2314:
Generic type 'ModuleWithProviders' requires 1 type argument(s).
static forRoot(config: AuthConfig): ModuleWithProviders;
Also connected to that (so I believe the errors are concurrent or even, I am afraid, interchangeable), because it was shown as soon as the 'ModuleWithProviders<T>' error was shown, so I though it would make sense to show them both as they are linked together:
Error: node_modules/angular2-jwt/angular2-jwt.d.ts:1:77 - error
TS2307: Cannot find module '#angular/http' or its corresponding type
declarations.
1 import { Http, Request, RequestOptions, RequestOptionsArgs, Response
} from "#angular/http";
So the difficulty I have is also due to the fact that I am not sure which parts of the code are affected so I will put for the sake of completeness the app.module.ts and the files carrying the jwt include
app.module.ts:
import { ValidateService } from './services/validate.service';
import { FlashMessagesModule } from 'angular2-flash-messages';
import { HttpClientModule } from '#angular/common/http';
import { AuthService } from './services/auth.service';
import { AuthGuard } from './guards/auth.guards';
const appRoutes: Routes = [
{path:'', component: HomeComponent},
{path:'register', component: RegisterComponent},
{path:'login', component: LoginComponent},
{path:'dashboard', component: DashboardComponent, canActivate: [AuthGuard]},
{path:'profile', component: ProfileComponent, canActivate: [AuthGuard]},
]
#NgModule({
declarations: [
AppComponent,
NavbarComponent,
LoginComponent,
RegisterComponent,
HomeComponent,
DashboardComponent,
ProfileComponent
],
imports: [
BrowserModule,
AppRoutingModule,
FormsModule,
RouterModule.forRoot(appRoutes),
FlashMessagesModule.forRoot(),
HttpClientModule,
],
providers: [ValidateService, AuthService, AuthGuard],
bootstrap: [AppComponent]
})
export class AppModule { }
auth.service.ts
import { Injectable } from '#angular/core';
import { HttpClient, HttpHeaders } from '#angular/common/http';
import { map } from 'rxjs/operators';
import { tokenNotExpired } from 'angular2-jwt';
#Injectable({
providedIn: 'root'
})
export class AuthService {
authToken: any;
user: any;
constructor(private httpClient: HttpClient) { }
registerUser(user) {
const httpOptions = {
headers: new HttpHeaders({
'Content-Type': 'application/json',
})
};
return this.httpClient.post('http://localhost:3000/users/register', user, httpOptions);
}
authenticateUser(user) {
const httpOptions = {
headers: new HttpHeaders({
'Content-Type': 'application/json',
})
};
return this.httpClient.post('http://localhost:3000/users/authenticate', user, httpOptions);
}
getProfile() {
const httpOptions = {
headers: new HttpHeaders({
'Content-Type': 'application/json',
Authorization: this.authToken,
})
};
this.loadToken();
return this.httpClient.get('http://localhost:3000/users/profile', httpOptions);
}
storeUserData(token, user) {
localStorage.setItem('id_token', token);
localStorage.setItem('user', JSON.stringify(user));
this.authToken = token;
this.user = user;
}
loadToken() {
const token = localStorage.getItem('id_token');
this.authToken = token;
}
loggedIn() {
return tokenNotExpired();
}
logout() {
this.authToken = null;
this.user = null;
localStorage.clear();
}
}
profile.components.ts
import { Component, OnInit } from '#angular/core';
import { AuthService } from '../../services/auth.service';
import { Router } from '#angular/router';
#Component({
selector: 'app-profile',
templateUrl: './profile.component.html',
styleUrls: ['./profile.component.css']
})
export class ProfileComponent implements OnInit {
user: Object = {};
constructor(private authService: AuthService, private router: Router) { }
ngOnInit(): void {
this.authService.getProfile().subscribe(profile => {
this.user = profile;
},
err => {
console.log(err);
return false;
})
}
}
I did research on how to solve the problem and here is was I was able to find so far:
this post is very useful because it has my same exact problem.
The answer calls for a bug report repo that, however, does not provide any answer to that.
The answer that was provided suggests to insert the following code:
declare module "#angular/core" {
interface ModuleWithProviders<T = any> {
ngModule: Type<T>;
providers?: Provider[];
}
}
Unfortunately this was not an accepted answer and I am not sure where I can put this piece of code in any part of the app.module.ts I provided above.
I also studied this post which was also useful but did not use the suggestion above.
The strange fact I understand from the error is that it seems to come from the library itself and not from the code that I wrote.
Following this I proceeded with:
rm -rf all the node_modules
rm -rf the package jason file
clean the cache
npm install
But outcome is the same, I always receive the same error on the same library.
Please if anyone had the same problem can you share how it was solved and what should I do more to take care of that.

Answer 1

Insert this piece of code into the angular2-jwt.d.ts class and confirm the class change:
declare module "#angular/core" {
interface ModuleWithProviders<T = any> {
ngModule: Type<T>;
providers?: Provider[];
}
}
But you should use a newer library than this, like #auth0/angular-jwt
After installing this library, you must register its module in the class app.module.ts :
import {JwtModule} from '#auth0/angular-jwt'
imports: [
JwtModule.forRoot({
config: {
tokenGetter:() => {
return localStorage.getItem('access_token');
},
},
})
],
And then you can use it in your AuthService class:
import {JwtHelperService} from '#auth0/angular-jwt';
constructor(public jwtHelper: JwtHelperService) {
}
isAuthenticated(): boolean {
return !this.jwtHelper.isTokenExpired(this.token);
}
All this is explained in a short documentation with examples (https://www.npmjs.com/package/#auth0/angular-jwt), so don't be lazy to read it before using any library.