Simple Session Manager Service in angular

SessionManagerService.ts

import { Injectable } from "@angular/core";

@Injectable({
  providedIn: "root"
})
export class SessionManagerService {
  constructor() {}

  set(key: string, value: any): SessionManagerService {
    if (value instanceof Object) {
      value = JSON.stringify(value);
    }

    localStorage.setItem(key, value);

    return this;
  }

  get(key: string): string {
    return localStorage.getItem(key);
  }

  forget(key: string): void {
    localStorage.removeItem(key);
  }

  destroy(): void {
    localStorage.clear();
  }
}