I'm trying to ask by the type or class required to add an item in an Array using typescript, I tried this.

I wan't to build a loop to build buttons to add an element to arrays attributes whose extends from a parent common class example, GenericItem

Class Item extends GenericItem

End

The Main Class

Class mainClass

   items: Array<Item>(); 
   ...
   // Many of arrays 
End

Iterating the arrays and create buttons

// Loop each of  GenericItem Arrays

let add_btn = document.createElement('button');
add_btn.onclick = (e) => { 
                    // Add an object item to array using the correct class
                }
// end loop