Function Subscription

packages/use-subscription/src/__tests__/useSubscription-test.js:68–82

({source})

    }

    function Subscription({source}) {
      const value = useSubscription(
        React.useMemo(
          () => ({
            getCurrentValue: () => source.getValue(),
            subscribe: callback => {
              const subscription = source.subscribe(callback);
              return () => subscription.unsubscribe();
            },
          }),
          [source],
        ),
      );
      return <Child value={value} />;
    }

    const observable = createBehaviorSubject();
    const root = ReactDOMClient.createRoot(document.createElement('div'));