TypeScript Angular Factory

storageService.ts

export interface IStorageService {
  set(key: string, value: any): void;
  remove(key: string): void;
  get(key: string, defaultValue: any): any;
  setObject(key: string, value: any): void;
  getObject(key: string): any;
  removeObject (key: string): void;
}

class StorageService implements IStorageService {
  private storage: any;
  constructor(private $window: angular.IWindowService) {
    this.storage = this.storage;
  }
  set(key: string, value: any) {
    this.storage[key] = value;
  };
  get(key: string, defaultValue: any) {
     return this.storage[key] || defaultValue;
  };
  remove(key: string) {
    this.storage.removeItem(key);
  };
  setObject(key: string, value: any) {
    this.storage[key] = JSON.stringify(value);
  };
  getObject(key: string) {
    return JSON.parse(this.storage[key] || "{}");
  };
  removeObject(key: string) {
    this.remove(key);
  };
}

factory.$inject = ["$window"];
function factory($window: angular.IWindowService): IStorageService {
  return new StorageService($window);
}

angular
  .module("Services.StorageService", [])
  .factory("storageService", factory);