ReactFlightServerTemporaryReferences.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
 */

const TEMPORARY_REFERENCE_TAG = Symbol.for('react.temporary.reference');

export opaque type TemporaryReferenceSet = WeakMap<
  TemporaryReference<any>,
  string,
>;

// eslint-disable-next-line no-unused-vars
export interface TemporaryReference<T> {}

export function createTemporaryReferenceSet(): TemporaryReferenceSet {
  return new WeakMap();
}

export function isOpaqueTemporaryReference(reference: Object): boolean {
  return reference.$$typeof === TEMPORARY_REFERENCE_TAG;
}

export function resolveTemporaryReference<T>(
  temporaryReferences: TemporaryReferenceSet,
  temporaryReference: TemporaryReference<T>,
): void | string {
  return temporaryReferences.get(temporaryReference);
}

const proxyHandlers: Proxy$traps<mixed> = {
  get: function (
    target: Function,
    name: string | symbol,
    receiver: Proxy<Function>,
  ) {
    switch (name) {
      // These names are read by the Flight runtime if you end up using the exports object.
      case '$$typeof':
        // These names are a little too common. We should probably have a way to
        // have the Flight runtime extract the inner target instead.
        return target.$$typeof;
      case 'name':
        return undefined;
      case 'displayName':
        return undefined;
      // We need to special case this because createElement reads it if we pass this
      // reference.
      case 'defaultProps':
        return undefined;
      // React looks for debugInfo on thenables.
      case '_debugInfo':
        return undefined;
      // Avoid this attempting to be serialized.
      case 'toJSON':
        return undefined;
// ... (62 more lines)