ReactDOMFlightServerHostDispatcher.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 {
  CrossOriginEnum,
  PreloadImplOptions,
  PreloadModuleImplOptions,
  PreinitStyleOptions,
  PreinitScriptOptions,
  PreinitModuleScriptOptions,
} from 'react-dom/src/shared/ReactDOMTypes';

import {
  emitHint,
  getHints,
  resolveRequest,
} from 'react-server/src/ReactFlightServer';

import ReactDOMSharedInternals from 'shared/ReactDOMSharedInternals';

const previousDispatcher =
  ReactDOMSharedInternals.d; /* ReactDOMCurrentDispatcher */
ReactDOMSharedInternals.d /* ReactDOMCurrentDispatcher */ = {
  f /* flushSyncWork */: previousDispatcher.f /* flushSyncWork */,
  r /* requestFormReset */: previousDispatcher.r /* requestFormReset */,
  D /* prefetchDNS */: prefetchDNS,
  C /* preconnect */: preconnect,
  L /* preload */: preload,
  m /* preloadModule */: preloadModule,
  X /* preinitScript */: preinitScript,
  S /* preinitStyle */: preinitStyle,
  M /* preinitModuleScript */: preinitModuleScript,
};

function prefetchDNS(href: string) {
  if (typeof href === 'string' && href) {
    const request = resolveRequest();
    if (request) {
      const hints = getHints(request);
      const key = 'D|' + href;
      if (hints.has(key)) {
        // duplicate hint
        return;
      }
      hints.add(key);
      emitHint(request, 'D', href);
    } else {
      previousDispatcher.D(/* prefetchDNS */ href);
    }
  }
}

function preconnect(href: string, crossOrigin?: ?CrossOriginEnum) {
  if (typeof href === 'string') {
// ... (213 more lines)