useRef-test.internal.js — react Source File

Source Code

/**
 * 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.
 *
 * @emails react-core
 * @jest-environment node
 */

'use strict';

describe('useRef', () => {
  let React;
  let ReactNoop;
  let Scheduler;
  let act;
  let useCallback;
  let useEffect;
  let useLayoutEffect;
  let useRef;
  let useState;
  let waitForAll;
  let assertLog;

  beforeEach(() => {
    React = require('react');
    ReactNoop = require('react-noop-renderer');
    Scheduler = require('scheduler');

    act = require('internal-test-utils').act;
    useCallback = React.useCallback;
    useEffect = React.useEffect;
    useLayoutEffect = React.useLayoutEffect;
    useRef = React.useRef;
    useState = React.useState;

    const InternalTestUtils = require('internal-test-utils');
    waitForAll = InternalTestUtils.waitForAll;
    assertLog = InternalTestUtils.assertLog;
  });

  function Text(props) {
    Scheduler.log(props.text);
    return <span prop={props.text} />;
  }

  it('creates a ref object initialized with the provided value', async () => {
    jest.useFakeTimers();

    function useDebouncedCallback(callback, ms, inputs) {
      const timeoutID = useRef(-1);
      useEffect(() => {
        return function unmount() {
          clearTimeout(timeoutID.current);
        };
      }, []);
      const debouncedCallback = useCallback(
        (...args) => {
          clearTimeout(timeoutID.current);
// ... (181 more lines)