Custom feature docs clarification

[ambid17]

I am trying to create a custom feature that allows the user to bulk edit multiple cells in the same column. The goal is to bring in the copy/paste functionality from Excel: where you can select multiple cells, copy them, and then paste the contents of that block of cells in another area of the table.

I was following the "Custom Features Guide" but it appears Typescript is unhappy about extending "TableOptionsResolved".

So, two questions:

• does anyone have an example laying around for what I am trying to do that would work with V8?
  I am basically trying to migrate this guy to V8: useCellRangeSelection - Working on this hook, Ability to select cell ranges and single select (UI demo) #2476
• is this a problem with my Typescript configuration, or is this an issue with the documentation?

[KevinVandy]

The generics must match in order for declaration merging to work. Make sure it is:
interface TableOptionsResolved<TData extends RowData>
and not
interface TableOptionsResolved