internalAct.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 strict
 */

// This version of `act` is only used by our tests. Unlike the public version
// of `act`, it's designed to work identically in both production and
// development. It may have slightly different behavior from the public
// version, too, since our constraints in our test suite are not the same as
// those of developers using React — we're testing React itself, as opposed to
// building an app with React.

import type {Thenable} from 'shared/ReactTypes';

import * as Scheduler from 'scheduler/unstable_mock';

import enqueueTask from './enqueueTask';
import {assertConsoleLogsCleared} from './consoleMock';
import {diff} from 'jest-diff';

export let actingUpdatesScopeDepth: number = 0;

export const thrownErrors: Array<mixed> = [];

async function waitForMicrotasks() {
  return new Promise(resolve => {
    enqueueTask(() => resolve());
  });
}

function aggregateErrors(errors: Array<mixed>): mixed {
  if (errors.length > 1 && typeof AggregateError === 'function') {
    // eslint-disable-next-line no-undef
    return new AggregateError(errors);
  }
  return errors[0];
}

export async function act<T>(scope: () => Thenable<T>): Thenable<T> {
  if (Scheduler.unstable_flushUntilNextPaint === undefined) {
    throw Error(
      'This version of `act` requires a special mock build of Scheduler.',
    );
  }

  const actualYields = Scheduler.unstable_clearLog();
  if (actualYields.length !== 0) {
    const error = Error(
      'Log of yielded values is not empty. Call assertLog first.\n\n' +
        `Received:\n${diff('', actualYields.join('\n'), {
          omitAnnotationLines: true,
        })}`,
    );
    Error.captureStackTrace(error, act);
    throw error;
  }
// ... (238 more lines)