ReactMemo-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
 * @jest-environment node
 */

/* eslint-disable no-func-assign */

'use strict';

let React;
let ReactNoop;
let Suspense;
let Scheduler;
let act;
let waitForAll;
let assertLog;
let assertConsoleErrorDev;

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

    React = require('react');
    ReactNoop = require('react-noop-renderer');
    Scheduler = require('scheduler');
    act = require('internal-test-utils').act;
    ({Suspense} = React);

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

  function Text(props) {
    Scheduler.log(props.text);
    return <span prop={props.text} />;
  }

  async function fakeImport(result) {
    return {default: result};
  }

  // Tests should run against both the lazy and non-lazy versions of `memo`.
  // To make the tests work for both versions, we wrap the non-lazy version in
  // a lazy function component.
  sharedTests('normal', (...args) => {
    const Memo = React.memo(...args);
    function Indirection(props) {
      return <Memo {...props} />;
    }
    return React.lazy(() => fakeImport(Indirection));
  });
  sharedTests('lazy', (...args) => {
    const Memo = React.memo(...args);
// ... (501 more lines)