ReactSuspenseFallback-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.
 *
 * @flow
 */
let React;
let ReactNoop;
let Scheduler;
let Suspense;
let getCacheForType;
let caches;
let seededCache;
let waitForAll;

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

    React = require('react');
    ReactNoop = require('react-noop-renderer');
    Scheduler = require('scheduler');
    Suspense = React.Suspense;
    getCacheForType = React.unstable_getCacheForType;
    caches = [];
    seededCache = null;

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

  function createTextCache() {
    if (seededCache !== null) {
      // Trick to seed a cache before it exists.
      // TODO: Need a built-in API to seed data before the initial render (i.e.
      // not a refresh because nothing has mounted yet).
      const cache = seededCache;
      seededCache = null;
      return cache;
    }

    const data = new Map();
    const version = caches.length + 1;
    const cache = {
      version,
      data,
      resolve(text) {
        const record = data.get(text);
        if (record === undefined) {
          const newRecord = {
            status: 'resolved',
            value: text,
          };
          data.set(text, newRecord);
        } else if (record.status === 'pending') {
          const thenable = record.value;
          record.status = 'resolved';
          record.value = text;
// ... (182 more lines)