ReactIncrementalUpdates-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
 */

'use strict';

let React;
let ReactNoop;
let Scheduler;
let ContinuousEventPriority;
let act;
let waitForAll;
let waitFor;
let assertLog;
let assertConsoleErrorDev;

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

    React = require('react');
    ReactNoop = require('react-noop-renderer');
    Scheduler = require('scheduler');
    act = require('internal-test-utils').act;
    ContinuousEventPriority =
      require('react-reconciler/constants').ContinuousEventPriority;

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

  function Text({text}) {
    Scheduler.log(text);
    return text;
  }

  it('applies updates in order of priority', async () => {
    let state;
    class Foo extends React.Component {
      state = {};
      componentDidMount() {
        Scheduler.log('commit');
        React.startTransition(() => {
          // Has low priority
          this.setState({b: 'b'});
          this.setState({c: 'c'});
        });
        // Has Task priority
        this.setState({a: 'a'});
      }
      render() {
// ... (629 more lines)