Datenkapselung mittels privater Felder und Zugriffsmethoden in Services

import { Injectable } from '@angular/core';
 
@Injectable({ providedIn: 'root' })
export class SessionManager {
  #authToken: string | null = null;
 
  get isAuthenticated(): boolean {
    return this.#authToken !== null;
  }
 
  set authToken(token: string) {
    if (!token.trim()) {
      throw new Error('Token cannot be empty');
    }
    this.#authToken = token;
  }
 
  clearSession(): void {
    this.#authToken = null;
  }
}