ReactSuspensePlaceholder-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
 */

let Profiler;
let React;
let ReactNoop;
let Scheduler;
let ReactFeatureFlags;
let ReactCache;
let Suspense;
let TextResource;
let textResourceShouldFail;
let waitForAll;
let assertLog;
let act;

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

    ReactFeatureFlags = require('shared/ReactFeatureFlags');

    ReactFeatureFlags.enableProfilerTimer = true;
    React = require('react');
    ReactNoop = require('react-noop-renderer');
    Scheduler = require('scheduler');
    ReactCache = require('react-cache');

    Profiler = React.Profiler;
    Suspense = React.Suspense;

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

    TextResource = ReactCache.unstable_createResource(
      ([text, ms = 0]) => {
        let listeners = null;
        let status = 'pending';
        let value = null;
        return {
          then(resolve, reject) {
            switch (status) {
              case 'pending': {
                if (listeners === null) {
                  listeners = [{resolve, reject}];
                  setTimeout(() => {
                    if (textResourceShouldFail) {
                      Scheduler.log(`Promise rejected [${text}]`);
                      status = 'rejected';
                      value = new Error('Failed to load: ' + text);
                      listeners.forEach(listener => listener.reject(value));
// ... (564 more lines)