ReactCacheOld.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
 */

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

import * as React from 'react';

import {createLRU} from './LRU';

interface Suspender {
  then(resolve: () => mixed, reject: () => mixed): mixed;
}

type PendingResult = {
  status: 0,
  value: Suspender,
};

type ResolvedResult<V> = {
  status: 1,
  value: V,
};

type RejectedResult = {
  status: 2,
  value: mixed,
};

type Result<V> = PendingResult | ResolvedResult<V> | RejectedResult;

type Resource<I, V> = {
  read(I): V,
  preload(I): void,
  ...
};

const Pending = 0;
const Resolved = 1;
const Rejected = 2;

const SharedInternals =
  React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE;

function readContext(Context: ReactContext<mixed>) {
  const dispatcher = SharedInternals.H;
  if (dispatcher === null) {
    // This wasn't being minified but we're going to retire this package anyway.
    // eslint-disable-next-line react-internal/prod-error-codes
    throw new Error(
      'react-cache: read and preload may only be called from within a ' +
        "component's render. They are not supported in event handlers or " +
        'lifecycle methods.',
    );
  }
// ... (132 more lines)