1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
import { StrictMode } from 'react'import { fireEvent, render } from '@testing-library/react'import * as O from 'optics-ts'import { atom, useAtom } from 'jotai'import { focusAtom } from 'jotai/optics'import { getTestProvider } from '../testUtils'
const Provider = getTestProvider()
it('updates traversals', async () => {  const bigAtom = atom<{ a?: number }[]>([{ a: 5 }, {}, { a: 6 }])  const focusFunction = (optic: O.OpticFor<{ a?: number }[]>) =>    optic.elems().prop('a').optional()
  const Counter = () => {    const [count, setCount] = useAtom(focusAtom(bigAtom, focusFunction))    const [bigAtomValue] = useAtom(bigAtom)    return (      <>        <div>bigAtom: {JSON.stringify(bigAtomValue)}</div>        <div>count: {count.join(',')}</div>        <button onClick={() => setCount((c) => c + 1)}>button</button>      </>    )  }
  const { getByText, findByText } = render(    <StrictMode>      <Provider>        <Counter />      </Provider>    </StrictMode>  )
  await findByText('count: 5,6')  await findByText('bigAtom: [{"a":5},{},{"a":6}]')
  fireEvent.click(getByText('button'))  await findByText('count: 6,7')  await findByText('bigAtom: [{"a":6},{},{"a":7}]')})