JestReact.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.
 */

import {REACT_ELEMENT_TYPE, REACT_FRAGMENT_TYPE} from 'shared/ReactSymbols';
const {assertConsoleLogsCleared} = require('internal-test-utils/consoleMock');

import isArray from 'shared/isArray';

function captureAssertion(fn) {
  // Trick to use a Jest matcher inside another Jest matcher. `fn` contains an
  // assertion; if it throws, we capture the error and return it, so the stack
  // trace presented to the user points to the original assertion in the
  // test file.
  try {
    fn();
  } catch (error) {
    return {
      pass: false,
      message: () => error.message,
    };
  }
  return {pass: true};
}

function assertYieldsWereCleared(root) {
  const Scheduler = root._Scheduler;
  const actualYields = Scheduler.unstable_clearLog();
  if (actualYields.length !== 0) {
    const error = Error(
      'Log of yielded values is not empty. ' +
        'Call expect(ReactTestRenderer).unstable_toHaveYielded(...) first.',
    );
    Error.captureStackTrace(error, assertYieldsWereCleared);
    throw error;
  }
  assertConsoleLogsCleared();
}

function createJSXElementForTestComparison(type, props) {
  if (__DEV__) {
    const element = {
      $$typeof: REACT_ELEMENT_TYPE,
      type: type,
      key: null,
      props: props,
      _owner: null,
      _store: __DEV__ ? {} : undefined,
    };
    Object.defineProperty(element, 'ref', {
      enumerable: false,
      value: null,
    });
    return element;
  } else {
    return {
      $$typeof: REACT_ELEMENT_TYPE,
// ... (78 more lines)