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useQueries.js
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Sat, Jul 26, 16:14

useQueries.js

import React, { useMemo } from 'react';
import { notifyManager } from '../core/notifyManager';
import { QueriesObserver } from '../core/queriesObserver';
import { useQueryClient } from './QueryClientProvider';
export function useQueries(queries) {
var mountedRef = React.useRef(false);
var _React$useState = React.useState(0),
forceUpdate = _React$useState[1];
var queryClient = useQueryClient();
var defaultedQueries = useMemo(function () {
return queries.map(function (options) {
var defaultedOptions = queryClient.defaultQueryObserverOptions(options); // Make sure the results are already in fetching state before subscribing or updating options
defaultedOptions.optimisticResults = true;
return defaultedOptions;
});
}, [queries, queryClient]);
var _React$useState2 = React.useState(function () {
return new QueriesObserver(queryClient, defaultedQueries);
}),
observer = _React$useState2[0];
var result = observer.getOptimisticResult(defaultedQueries);
React.useEffect(function () {
mountedRef.current = true;
var unsubscribe = observer.subscribe(notifyManager.batchCalls(function () {
if (mountedRef.current) {
forceUpdate(function (x) {
return x + 1;
});
}
}));
return function () {
mountedRef.current = false;
unsubscribe();
};
}, [observer]);
React.useEffect(function () {
// Do not notify on updates because of changes in the options because
// these changes should already be reflected in the optimistic result.
observer.setQueries(defaultedQueries, {
listeners: false
});
}, [defaultedQueries, observer]);
return result;
}

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