gistfile1.txt

export interface State {}

const state: State = {};

export class Store {

  private subject = new BehaviorSubject<State>(state);
  private store = this.subject.asObservable().distinctUntilChanged();

  get value() {
    return this.subject.value;
  }

  select<T>(name: string): Observable<T> {
    return this.store.pluck(name);
  }

  set(name: string, state: any) {
    this.subject.next({ ...this.value, [name]: state });
  }

}