ReactFiberHostContext.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 {Fiber} from './ReactInternalTypes';
import type {StackCursor} from './ReactFiberStack';
import type {
  Container,
  HostContext,
  TransitionStatus,
} from './ReactFiberConfig';
import type {Hook} from './ReactFiberHooks';

import {
  getChildHostContext,
  getRootHostContext,
  HostTransitionContext,
  NotPendingTransition,
  isPrimaryRenderer,
} from './ReactFiberConfig';
import {createCursor, push, pop} from './ReactFiberStack';

const contextStackCursor: StackCursor<HostContext | null> = createCursor(null);
const contextFiberStackCursor: StackCursor<Fiber | null> = createCursor(null);
const rootInstanceStackCursor: StackCursor<Container | null> =
  createCursor(null);

// Represents the nearest host transition provider (in React DOM, a <form />)
// NOTE: Since forms cannot be nested, and this feature is only implemented by
// React DOM, we don't technically need this to be a stack. It could be a single
// module variable instead.
const hostTransitionProviderCursor: StackCursor<Fiber | null> =
  createCursor(null);

function requiredContext<Value>(c: Value | null): Value {
  if (__DEV__) {
    if (c === null) {
      console.error(
        'Expected host context to exist. This error is likely caused by a bug ' +
          'in React. Please file an issue.',
      );
    }
  }
  return (c: any);
}

function getCurrentRootHostContainer(): null | Container {
  return rootInstanceStackCursor.current;
}

function getRootHostContainer(): Container {
  const rootInstance = requiredContext(rootInstanceStackCursor.current);
  return rootInstance;
}

// ... (109 more lines)