index.ts — 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 * as React from 'react';

const {useRef, useEffect, isValidElement} = React;
const ReactSecretInternals =
  //@ts-ignore
  React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE ??
  //@ts-ignore
  React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED;

type MemoCache = Array<number | typeof $empty>;

const $empty = Symbol.for('react.memo_cache_sentinel');

// Re-export React.c if present, otherwise fallback to the userspace polyfill for versions of React
// < 19.
export const c =
  // @ts-expect-error
  typeof React.__COMPILER_RUNTIME?.c === 'function'
    ? // @ts-expect-error
      React.__COMPILER_RUNTIME.c
    : function c(size: number) {
        return React.useMemo<Array<unknown>>(() => {
          const $ = new Array(size);
          for (let ii = 0; ii < size; ii++) {
            $[ii] = $empty;
          }
          // This symbol is added to tell the react devtools that this array is from
          // useMemoCache.
          // @ts-ignore
          $[$empty] = true;
          return $;
        }, []);
      };

const LazyGuardDispatcher: {[key: string]: (...args: Array<any>) => any} = {};
[
  'readContext',
  'useCallback',
  'useContext',
  'useEffect',
  'useImperativeHandle',
  'useInsertionEffect',
  'useLayoutEffect',
  'useMemo',
  'useReducer',
  'useRef',
  'useState',
  'useDebugValue',
  'useDeferredValue',
  'useTransition',
  'useMutableSource',
  'useSyncExternalStore',
  'useId',
// ... (358 more lines)