[Bug] ANGULAR PARTE 2: AUTENTICAÇÃO, FORMS E LAZY LOADING AULA ATUAL 03. Usuário logado e proteção de rotas

estou fazendo o curso do ANGULAR PARTE 2: AUTENTICAÇÃO, FORMS E LAZY LOADING https://cursos.alura.com.br/course/angular-autenticacao e no 3 topico 03. Usuário logado e proteção de rotas na primeira aula ele ensina como importa o jwt_decode porem me retorna esse erro

estou com problemas no .

import * as jwt_decode from 'jwt-decode';

. . aqui fala da a seguinte mensagem . .

✔ Browser application bundle generation complete.

Initial Chunk Files | Names   |  Raw Size
main.js             | main    | 142.85 kB | 
runtime.js          | runtime |   6.54 kB | 

3 unchanged chunks

Build at: 2023-11-09T13:28:40.133Z - Hash: cbd41ed6367eb467 - Time: 392ms

Error: src/app/core/auth/auth.service.ts:24:33 - error TS2345: Argument of type 'string | null' is not assignable to parameter of type 'string'.
  Type 'null' is not assignable to type 'string'.

24       this.UserService.setToken(authToken);
                                   ~~~~~~~~~


Error: src/app/core/user/user.service.ts:5:25 - error TS7016: Could not find a declaration file for module 'jwt-decode'. 'C:/Users/luizcarlos/Documents/GitHub/unicommerce-angular-web/unicommerce-angular-web/node_modules/jwt-decode/lib/index.js' implicitly has an 'any' type.
  Try `npm i --save-dev @types/jwt-decode` if it exists or add a new declaration (.d.ts) file containing `declare module 'jwt-decode';`

5 import  jwt_decode from 'jwt-decode';
                          ~~~~~~~~~~~~




× Failed to compile.

.

meu aquivo user.service.ts .

import { Injectable } from "@angular/core";
import { User } from "./user";
import { Subject } from "rxjs";
import { tokenService } from "../token/token.service";
import * as jwt_decode from 'jwt-decode';

@Injectable({ providedIn: 'root' })
export class UserService {

    private userSubject = new Subject<User>();

    constructor(private tokenService: tokenService) {

        this.tokenService.hasToken() &&
            this.decodeAndNotify();
    }

    setToken(token: string) {
        this.tokenService.setToken(token);
        this.decodeAndNotify();
    }

    getUser() {
        return this.userSubject.asObservable();
    }

    private decodeAndNotify() {
        const token = this.tokenService.getToken();
        const user = jwt_decode(token) as User;  
        this.userSubject.next(user);
    }
}

 

.

a versao que eu utilizo e a passada no video .