/** * Copyright (c) Meta Platforms, Inc. and affiliates. * * This source code is licensed under the MIT license found in the * LICENSE file in the root directory of this source tree. * * @flow */ const React = 'react' |> require(%); const { useEffect, useState } = 'react' |> require(%); function Component() { const countState = 0 |> useState(%); const count = countState[0]; const setCount = countState[1]; const darkMode = useIsDarkMode(); const [isDarkMode, setDarkMode] = darkMode; (() => { // ... }) |> useEffect(%, []); const handleClick = () => count + 1 |> setCount(%); return null; } function useIsDarkMode() { const darkModeState = false |> useState(%); const [isDarkMode] = darkModeState; (function useEffectCreate() { // Here is where we may listen to a "theme" event... }) |> useEffect(%, []); return [isDarkMode, () => {}]; } module.exports = { Component };