planning

node_modules/react-redux/es/components/Provider.js

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+import React, { useMemo } from 'react';
+import PropTypes from 'prop-types';
+import { ReactReduxContext } from './Context';
+import { createSubscription } from '../utils/Subscription';
+import { useIsomorphicLayoutEffect } from '../utils/useIsomorphicLayoutEffect';
+
+function Provider(_ref) {
+  var store = _ref.store,
+      context = _ref.context,
+      children = _ref.children;
+  var contextValue = useMemo(function () {
+    var subscription = createSubscription(store);
+    return {
+      store: store,
+      subscription: subscription
+    };
+  }, [store]);
+  var previousState = useMemo(function () {
+    return store.getState();
+  }, [store]);
+  useIsomorphicLayoutEffect(function () {
+    var subscription = contextValue.subscription;
+    subscription.onStateChange = subscription.notifyNestedSubs;
+    subscription.trySubscribe();
+
+    if (previousState !== store.getState()) {
+      subscription.notifyNestedSubs();
+    }
+
+    return function () {
+      subscription.tryUnsubscribe();
+      subscription.onStateChange = null;
+    };
+  }, [contextValue, previousState]);
+  var Context = context || ReactReduxContext;
+  return /*#__PURE__*/React.createElement(Context.Provider, {
+    value: contextValue
+  }, children);
+}
+
+if (process.env.NODE_ENV !== 'production') {
+  Provider.propTypes = {
+    store: PropTypes.shape({
+      subscribe: PropTypes.func.isRequired,
+      dispatch: PropTypes.func.isRequired,
+      getState: PropTypes.func.isRequired
+    }),
+    context: PropTypes.object,
+    children: PropTypes.any
+  };
+}
+
+export default Provider;