react-esm/dist-src/ReactSharedInternals.js

React is a JavaScript library for building user interfaces.

/**
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */
import assign from 'object-assign';
import * as Scheduler from 'scheduler';
import * as SchedulerTracing from 'scheduler/tracing';
import ReactCurrentDispatcher from "./ReactCurrentDispatcher.js";
import ReactCurrentOwner from "./ReactCurrentOwner.js";
import ReactDebugCurrentFrame from "./ReactDebugCurrentFrame.js";
const ReactSharedInternals = {
  ReactCurrentDispatcher,
  ReactCurrentOwner,
  // Used by renderers to avoid bundling object-assign twice in UMD bundles:
  assign
};

if (__UMD__) {
  // Re-export the schedule API(s) for UMD bundles.
  // This avoids introducing a dependency on a new UMD global in a minor update,
  // Since that would be a breaking change (e.g. for all existing CodeSandboxes).
  // This re-export is only required for UMD bundles;
  // CJS bundles use the shared NPM package.
  Object.assign(ReactSharedInternals, {
    Scheduler,
    SchedulerTracing
  });
}

if (__DEV__) {
  Object.assign(ReactSharedInternals, {
    // These should not be included in production.
    ReactDebugCurrentFrame,
    // Shim for React DOM 16.0.0 which still destructured (but not used) this.
    // TODO: remove in React 17.0.
    ReactComponentTreeHook: {}
  });
}

export default ReactSharedInternals;