counter.store.ts

import { Injectable } from '@angular/core';
import { Store } from './store';

interface CountModel {
  value: number;
}

@Injectable()
export class CounterStore extends Store<CountModel> {
  private initialCount: CountModel = { value: 0 };
  
  constructor() {
    super(this.initialCount);
  }
  
  public setCount(val: number): void {
    this.setState({ value: this.getState().value + val });
  }

  public reset(): void {
    this.setState(this.initialCount);
  }
  
}