local-storage-wrapper.ts

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

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

  constructor() { }

  private localStorage = localStorage;

  remove(key) {
    return this.localStorage.removeItem(key);
  }

  get(key) {
    try {
      return JSON.parse(this.localStorage.getItem(key));
    } catch (e) {
      return null;
    }
  }

  set(key, value) {
      return localStorage.setItem(key, JSON.stringify(value));
  }
}