useSyncExternalStore-test.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
 */

'use strict';

let useSyncExternalStore;
let React;
let ReactNoop;
let Scheduler;
let act;
let useLayoutEffect;
let forwardRef;
let useImperativeHandle;
let useRef;
let useState;
let use;
let startTransition;
let waitFor;
let waitForAll;
let assertLog;
let Suspense;
let useMemo;
let textCache;

// This tests the native useSyncExternalStore implementation, not the shim.
// Tests that apply to both the native implementation and the shim should go
// into useSyncExternalStoreShared-test.js. The reason they are separate is
// because at some point we may start running the shared tests against vendored
// React DOM versions (16, 17, etc) instead of React Noop.
describe('useSyncExternalStore', () => {
  beforeEach(() => {
    jest.resetModules();

    React = require('react');
    ReactNoop = require('react-noop-renderer');
    Scheduler = require('scheduler');
    useLayoutEffect = React.useLayoutEffect;
    useImperativeHandle = React.useImperativeHandle;
    forwardRef = React.forwardRef;
    useRef = React.useRef;
    useState = React.useState;
    use = React.use;
    useSyncExternalStore = React.useSyncExternalStore;
    startTransition = React.startTransition;
    Suspense = React.Suspense;
    useMemo = React.useMemo;
    textCache = new Map();
    const InternalTestUtils = require('internal-test-utils');
    waitFor = InternalTestUtils.waitFor;
    waitForAll = InternalTestUtils.waitForAll;
    assertLog = InternalTestUtils.assertLog;

    act = require('internal-test-utils').act;
  });
// ... (385 more lines)