ReactDeferredValue-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.
 */

'use strict';

let React;
let ReactNoop;
let Scheduler;
let act;
let startTransition;
let useDeferredValue;
let useMemo;
let useState;
let Suspense;
let Activity;
let assertLog;
let waitForPaint;
let textCache;

describe('ReactDeferredValue', () => {
  beforeEach(() => {
    jest.resetModules();

    React = require('react');
    ReactNoop = require('react-noop-renderer');
    Scheduler = require('scheduler');
    act = require('internal-test-utils').act;
    startTransition = React.startTransition;
    useDeferredValue = React.useDeferredValue;
    useMemo = React.useMemo;
    useState = React.useState;
    Suspense = React.Suspense;
    Activity = React.Activity;

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

    textCache = new Map();
  });

  function resolveText(text) {
    const record = textCache.get(text);
    if (record === undefined) {
      const newRecord = {
        status: 'resolved',
        value: text,
      };
      textCache.set(text, newRecord);
    } else if (record.status === 'pending') {
      const thenable = record.value;
      record.status = 'resolved';
      record.value = text;
      thenable.pings.forEach(t => t());
    }
  }
// ... (1041 more lines)