ReactStartTransitionMultipleRenderers-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';

describe('ReactStartTransitionMultipleRenderers', () => {
  let act;
  let container;
  let React;
  let ReactDOMClient;
  let Scheduler;
  let assertLog;
  let startTransition;
  let useOptimistic;
  let textCache;

  beforeEach(() => {
    jest.resetModules();
    React = require('react');
    ReactDOMClient = require('react-dom/client');
    Scheduler = require('scheduler');
    act = require('internal-test-utils').act;
    assertLog = require('internal-test-utils').assertLog;
    startTransition = React.startTransition;
    useOptimistic = React.useOptimistic;
    container = document.createElement('div');
    document.body.appendChild(container);

    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(text));
    }
  }

  function getText(text) {
    const record = textCache.get(text);
    if (record === undefined) {
      const thenable = {
        pings: [],
        then(resolve) {
          if (newRecord.status === 'pending') {
// ... (84 more lines)