Typescript: Многомерные массивы

import { expect, test } from 'vitest'
import getField from './index';

test('function', () => {
  expect(getField(1)).toEqual([[null]]);
  expect(getField(2)).toEqual([[null, null], [null, null]]);
  expect(getField(3)).toEqual(
    [[null, null, null], [null, null, null], [null, null, null]],
  );
});