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85 lines
2.8 KiB
85 lines
2.8 KiB
"use strict";
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exports.__esModule = true;
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exports.createSelectorHook = createSelectorHook;
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exports.useSelector = exports.initializeUseSelector = void 0;
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var _react = require("react");
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var _useReduxContext = require("./useReduxContext");
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var _Context = require("../components/Context");
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var _useSyncExternalStore = require("../utils/useSyncExternalStore");
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let useSyncExternalStoreWithSelector = _useSyncExternalStore.notInitialized;
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const initializeUseSelector = fn => {
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useSyncExternalStoreWithSelector = fn;
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};
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exports.initializeUseSelector = initializeUseSelector;
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const refEquality = (a, b) => a === b;
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/**
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* Hook factory, which creates a `useSelector` hook bound to a given context.
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*
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* @param {React.Context} [context=ReactReduxContext] Context passed to your `<Provider>`.
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* @returns {Function} A `useSelector` hook bound to the specified context.
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*/
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function createSelectorHook(context = _Context.ReactReduxContext) {
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const useReduxContext = context === _Context.ReactReduxContext ? _useReduxContext.useReduxContext : () => (0, _react.useContext)(context);
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return function useSelector(selector, equalityFn = refEquality) {
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if (process.env.NODE_ENV !== 'production') {
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if (!selector) {
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throw new Error(`You must pass a selector to useSelector`);
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}
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if (typeof selector !== 'function') {
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throw new Error(`You must pass a function as a selector to useSelector`);
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}
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if (typeof equalityFn !== 'function') {
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throw new Error(`You must pass a function as an equality function to useSelector`);
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}
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}
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const {
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store,
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subscription,
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getServerState
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} = useReduxContext();
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const selectedState = useSyncExternalStoreWithSelector(subscription.addNestedSub, store.getState, getServerState || store.getState, selector, equalityFn);
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(0, _react.useDebugValue)(selectedState);
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return selectedState;
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};
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}
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/**
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* A hook to access the redux store's state. This hook takes a selector function
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* as an argument. The selector is called with the store state.
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*
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* This hook takes an optional equality comparison function as the second parameter
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* that allows you to customize the way the selected state is compared to determine
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* whether the component needs to be re-rendered.
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*
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* @param {Function} selector the selector function
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* @param {Function=} equalityFn the function that will be used to determine equality
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*
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* @returns {any} the selected state
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*
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* @example
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*
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* import React from 'react'
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* import { useSelector } from 'react-redux'
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*
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* export const CounterComponent = () => {
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* const counter = useSelector(state => state.counter)
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* return <div>{counter}</div>
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* }
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*/
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const useSelector = /*#__PURE__*/createSelectorHook();
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exports.useSelector = useSelector; |