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Edit File: useSelector.js

import { useCallback, useDebugValue, useRef } from 'react';
import { createReduxContextHook, useReduxContext as useDefaultReduxContext } from './useReduxContext';
import { ReactReduxContext } from '../components/Context';
import { notInitialized } from '../utils/useSyncExternalStore';
let useSyncExternalStoreWithSelector = notInitialized;
export const initializeUseSelector = fn => {
  useSyncExternalStoreWithSelector = fn;
};

const refEquality = (a, b) => a === b;
/**
 * 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 = ReactReduxContext) {
  const useReduxContext = context === ReactReduxContext ? useDefaultReduxContext : createReduxContextHook(context);
  return function useSelector(selector, equalityFnOrOptions = {}) {
    const {
      equalityFn = refEquality,
      stabilityCheck = undefined,
      noopCheck = undefined
    } = typeof equalityFnOrOptions === 'function' ? {
      equalityFn: equalityFnOrOptions
    } : equalityFnOrOptions;

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

if (typeof selector !== 'function') {
        throw new Error(`You must pass a function as a selector to useSelector`);
      }

if (typeof equalityFn !== 'function') {
        throw new Error(`You must pass a function as an equality function to useSelector`);
      }
    }

const {
      store,
      subscription,
      getServerState,
      stabilityCheck: globalStabilityCheck,
      noopCheck: globalNoopCheck
    } = useReduxContext();
    const firstRun = useRef(true);
    const wrappedSelector = useCallback({
      [selector.name](state) {
        const selected = selector(state);

if (process.env.NODE_ENV !== 'production') {
          const finalStabilityCheck = typeof stabilityCheck === 'undefined' ? globalStabilityCheck : stabilityCheck;

if (finalStabilityCheck === 'always' || finalStabilityCheck === 'once' && firstRun.current) {
            const toCompare = selector(state);

if (!equalityFn(selected, toCompare)) {
              let stack = undefined;

try {
                throw new Error();
              } catch (e) {
                ;
                ({
                  stack
                } = e);
              }

console.warn('Selector ' + (selector.name || 'unknown') + ' returned a different result when called with the same parameters. This can lead to unnecessary rerenders.' + '\nSelectors that return a new reference (such as an object or an array) should be memoized: https://redux.js.org/usage/deriving-data-selectors#optimizing-selectors-with-memoization', {
                state,
                selected,
                selected2: toCompare,
                stack
              });
            }
          }

const finalNoopCheck = typeof noopCheck === 'undefined' ? globalNoopCheck : noopCheck;

if (finalNoopCheck === 'always' || finalNoopCheck === 'once' && firstRun.current) {
            // @ts-ignore
            if (selected === state) {
              let stack = undefined;

try {
                throw new Error();
              } catch (e) {
                ;
                ({
                  stack
                } = e);
              }

console.warn('Selector ' + (selector.name || 'unknown') + ' returned the root state when called. This can lead to unnecessary rerenders.' + '\nSelectors that return the entire state are almost certainly a mistake, as they will cause a rerender whenever *anything* in state changes.', {
                stack
              });
            }
          }

if (firstRun.current) firstRun.current = false;
        }

return selected;
      }

}[selector.name], [selector, globalStabilityCheck, stabilityCheck]);
    const selectedState = useSyncExternalStoreWithSelector(subscription.addNestedSub, store.getState, getServerState || store.getState, wrappedSelector, equalityFn);
    useDebugValue(selectedState);
    return selectedState;
  };
}
/**
 * A hook to access the redux store's state. This hook takes a selector function
 * as an argument. The selector is called with the store state.
 *
 * This hook takes an optional equality comparison function as the second parameter
 * that allows you to customize the way the selected state is compared to determine
 * whether the component needs to be re-rendered.
 *
 * @param {Function} selector the selector function
 * @param {Function=} equalityFn the function that will be used to determine equality
 *
 * @returns {any} the selected state
 *
 * @example
 *
 * import React from 'react'
 * import { useSelector } from 'react-redux'
 *
 * export const CounterComponent = () => {
 *   const counter = useSelector(state => state.counter)
 *   return <div>{counter}</div>
 * }
 */

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