react/packages/react-reconciler/src/ReactFiberDevToolsHook.new.js

/**
 * 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.
 *
 * @flow
 */

import {enableProfilerTimer} from 'shared/ReactFeatureFlags';

import type {Fiber, FiberRoot, ReactPriorityLevel} from './ReactInternalTypes';
import type {ReactNodeList} from 'shared/ReactTypes';

import {DidCapture} from './ReactSideEffectTags';

declare var __REACT_DEVTOOLS_GLOBAL_HOOK__: Object | void;

let rendererID = null;
let injectedHook = null;
let hasLoggedError = false;

export const isDevToolsPresent =
  typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ !== 'undefined';

export function injectInternals(internals: Object): boolean {
  if (typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ === 'undefined') {
    // No DevTools
    return false;
  }
  const hook = __REACT_DEVTOOLS_GLOBAL_HOOK__;
  if (hook.isDisabled) {
    // This isn't a real property on the hook, but it can be set to opt out
    // of DevTools integration and associated warnings and logs.
    // https://github.com/facebook/react/issues/3877
    return true;
  }
  if (!hook.supportsFiber) {
    if (__DEV__) {
      console.error(
        'The installed version of React DevTools is too old and will not work ' +
          'with the current version of React. Please update React DevTools. ' +
          'https://fb.me/react-devtools',
      );
    }
    // DevTools exists, even though it doesn't support Fiber.
    return true;
  }
  try {
    rendererID = hook.inject(internals);
    // We have successfully injected, so now it is safe to set up hooks.
    injectedHook = hook;
  } catch (err) {
    // Catch all errors because it is unsafe to throw during initialization.
    if (__DEV__) {
      console.error('React instrumentation encountered an error: %s.', err);
    }
  }
  // DevTools exists
  return true;
}

export function onScheduleRoot(root: FiberRoot, children: ReactNodeList) {
  if (__DEV__) {
    if (
      injectedHook &&
      typeof injectedHook.onScheduleFiberRoot === 'function'
    ) {
      try {
        injectedHook.onScheduleFiberRoot(rendererID, root, children);
      } catch (err) {
        if (__DEV__ && !hasLoggedError) {
          hasLoggedError = true;
          console.error('React instrumentation encountered an error: %s', err);
        }
      }
    }
  }
}

export function onCommitRoot(
  root: FiberRoot,
  priorityLevel: ReactPriorityLevel,
) {
  if (injectedHook && typeof injectedHook.onCommitFiberRoot === 'function') {
    try {
      const didError = (root.current.effectTag & DidCapture) === DidCapture;
      if (enableProfilerTimer) {
        injectedHook.onCommitFiberRoot(
          rendererID,
          root,
          priorityLevel,
          didError,
        );
      } else {
        injectedHook.onCommitFiberRoot(rendererID, root, undefined, didError);
      }
    } catch (err) {
      if (__DEV__) {
        if (!hasLoggedError) {
          hasLoggedError = true;
          console.error('React instrumentation encountered an error: %s', err);
        }
      }
    }
  }
}

export function onCommitUnmount(fiber: Fiber) {
  if (injectedHook && typeof injectedHook.onCommitFiberUnmount === 'function') {
    try {
      injectedHook.onCommitFiberUnmount(rendererID, fiber);
    } catch (err) {
      if (__DEV__) {
        if (!hasLoggedError) {
          hasLoggedError = true;
          console.error('React instrumentation encountered an error: %s', err);
        }
      }
    }
  }
}