Is useTable a pure function with respect to the data array and columns array?

[johachi]

Hi!

I'm using react-table together with TypeScript and a functional programming oriented code base. Because of this, I ran into a problem when passing my data to useTable.

const data: ReadonlyArray<string> = useMemo(() => ... );

const {
  getTableProps,
  getTableBodyProps,
  headerGroups,
  rows,
  prepareRow,
} = useTable({
  columns,
  data,
});

Above code would give me a compilation error since the data passed to useTable has to be of type Array but my data is of type ReadonlyArray. I did go through the source code of useTable and could not find any place where data is directly modified, but I wanted to double check here first. (I don't want any hard to track down bugs.). If useTable is indeed a pure function (with regards to data and columns), then I can easily short term solve my problem by doing:

const {
 // ...
} = useTable({
  columns,
  data: data as Array<string>,
});

and then also do a PR to the type definitions repository (it is possible to pass an object of type Array to a function that take the type ReadonlyArray, but not the other way around).

Also if you read this Tanner, I just want to say that this is an awesome library and I can't wait to get to learn even more of it.