Order with version converter

Order.ts

class Order {

  // If it is the repository that is triggering the reconstruction it would use a version converter
  protected whenOrderCreated(event: OrderCreated): void {
        this._items = event.items;
        this._status = OrderStatus.OPEN;
        this._amount = event.amount;
        this._destination = event.destination;
        this._customerId = event.customerId;

        // New code - No need to check as the event that has been received 
        this._deliveryMethod = event.deliveryMethod;
    }
}

class OrderCreatedVersionConverter {
    protected convertFromV1(eventData) {
      eventData.deliveryMethod = 'Standard';
      
      return eventData;
    }
    
    convert(eventData): OrderCreated {
        if (!eventData.hasOwnProperty('version')) {
          return this.convertFromV1(eventData);
        }
        
        // As you add more versions you can convert from older versions until you have the latest one...
        
        return eventData;
    }
}