message: Of course instanceof doesn't work on interfaces.
diff: @@ -17,7 +17,7 @@ class D2ItemTransformer {
  */
  translateToDtrItem(item: DimItem | DestinyVendorSaleItemComponent): DtrItem {
  return {
  - referenceId: (item as DestinyVendorSaleItemComponent !== null) ? (item as DestinyVendorSaleItemComponent).itemHash : (item as DimItem).hash
  + referenceId: ((item as DestinyVendorSaleItemComponent).itemHash !== undefined) ? (item as DestinyVendorSaleItemComponent).itemHash : (item as DimItem).hash
  };
  }
  