trying to .filter order list

[gaunt crag]

trying to filter out the same products in the orders so each order is unique but not sure how

sort of need to combine both of those because it works when i add the products to the cart then they combine but when i try to see in the order it splits again

  public getUniqueProducts(order: Order) {
    return order
      .products
      .filter((product, index, self): product is Product => self.indexOf(product) === index && !!product); 
     
  }  

this is what i have not but doesn t work😅