31   items: StackItem<T>[];
106     const items: StackItem[] = [];  constant
126         items.push(item);
129       return items;
167         items.push(item);
171     return items;
212     const items = keys.map((key) => lookup[key]);  constant
215       items,
230   const [items, setItems] = React.useState<StackItem<T>[]>(stack.getState().items);  constant
234       setItems(state.items);
240   return items;