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编辑当前文件:/home/freeclou/app.optimyar.com/backend/node_modules/react-redux/es/hooks/useSelector.js

import { useReducer, useRef, useMemo, useContext, useDebugValue } from 'react';
import { useReduxContext as useDefaultReduxContext } from './useReduxContext';
import Subscription from '../utils/Subscription';
import { useIsomorphicLayoutEffect } from '../utils/useIsomorphicLayoutEffect';
import { ReactReduxContext } from '../components/Context';

var refEquality = function refEquality(a, b) {
  return a === b;
};

function useSelectorWithStoreAndSubscription(selector, equalityFn, store, contextSub) {
  var _useReducer = useReducer(function (s) {
    return s + 1;
  }, 0),
      forceRender = _useReducer[1];

var subscription = useMemo(function () {
    return new Subscription(store, contextSub);
  }, [store, contextSub]);
  var latestSubscriptionCallbackError = useRef();
  var latestSelector = useRef();
  var latestStoreState = useRef();
  var latestSelectedState = useRef();
  var storeState = store.getState();
  var selectedState;

try {
    if (selector !== latestSelector.current || storeState !== latestStoreState.current || latestSubscriptionCallbackError.current) {
      selectedState = selector(storeState);
    } else {
      selectedState = latestSelectedState.current;
    }
  } catch (err) {
    if (latestSubscriptionCallbackError.current) {
      err.message += "\nThe error may be correlated with this previous error:\n" + latestSubscriptionCallbackError.current.stack + "\n\n";
    }

throw err;
  }

useIsomorphicLayoutEffect(function () {
    latestSelector.current = selector;
    latestStoreState.current = storeState;
    latestSelectedState.current = selectedState;
    latestSubscriptionCallbackError.current = undefined;
  });
  useIsomorphicLayoutEffect(function () {
    function checkForUpdates() {
      try {
        var newSelectedState = latestSelector.current(store.getState());

if (equalityFn(newSelectedState, latestSelectedState.current)) {
          return;
        }

latestSelectedState.current = newSelectedState;
      } catch (err) {
        // we ignore all errors here, since when the component
        // is re-rendered, the selectors are called again, and
        // will throw again, if neither props nor store state
        // changed
        latestSubscriptionCallbackError.current = err;
      }

forceRender();
    }

subscription.onStateChange = checkForUpdates;
    subscription.trySubscribe();
    checkForUpdates();
    return function () {
      return subscription.tryUnsubscribe();
    };
  }, [store, subscription]);
  return selectedState;
}
/**
 * Hook factory, which creates a `useSelector` hook bound to a given context.
 *
 * @param {React.Context} [context=ReactReduxContext] Context passed to your `<Provider>`.
 * @returns {Function} A `useSelector` hook bound to the specified context.
 */

export function createSelectorHook(context) {
  if (context === void 0) {
    context = ReactReduxContext;
  }

var useReduxContext = context === ReactReduxContext ? useDefaultReduxContext : function () {
    return useContext(context);
  };
  return function useSelector(selector, equalityFn) {
    if (equalityFn === void 0) {
      equalityFn = refEquality;
    }

if (process.env.NODE_ENV !== 'production' && !selector) {
      throw new Error("You must pass a selector to useSelector");
    }

var _useReduxContext = useReduxContext(),
        store = _useReduxContext.store,
        contextSub = _useReduxContext.subscription;

export var useSelector = /*#__PURE__*/createSelectorHook();