Function useVirtualizerBase

packages/react-virtual/src/index.tsx:19–54

(
  options: VirtualizerOptions<TScrollElement, TItemElement>,
)

  typeof document !== 'undefined' ? React.useLayoutEffect : React.useEffect

function useVirtualizerBase<
  TScrollElement extends Element | Window,
  TItemElement extends Element,
>(
  options: VirtualizerOptions<TScrollElement, TItemElement>,
): Virtualizer<TScrollElement, TItemElement> {
  const rerender = React.useReducer(() => ({}), {})[1]

  const resolvedOptions: VirtualizerOptions<TScrollElement, TItemElement> = {
    ...options,
    onChange: (instance, sync) => {
      if (sync) {
        flushSync(rerender)
      } else {
        rerender()
      }
      options.onChange?.(instance, sync)
    },
  }

  const [instance] = React.useState(
    () => new Virtualizer<TScrollElement, TItemElement>(resolvedOptions),
  )

  instance.setOptions(resolvedOptions)

  useIsomorphicLayoutEffect(() => {
    return instance._didMount()
  }, [])

  useIsomorphicLayoutEffect(() => {
    return instance._willUpdate()
  })

  return instance
}

export function useVirtualizer<
  TScrollElement extends Element,