add isRunning state to useStopwatch

Author: amrlabib

src/useStopwatch.js

@@ -5,26 +5,26 @@ export default function useStopwatch(settings) {
   const { autoStart } = settings || {};
 
   const [seconds, setSeconds] = useState(0);
+  const [isRunning, setIsRunning] = useState(autoStart);
   const intervalRef = useRef();
 
   function clearIntervalRef() {
     if (intervalRef.current) {
+      setIsRunning(false);
       clearInterval(intervalRef.current);
       intervalRef.current = undefined;
     }
   }
 
   function start() {
     if (!intervalRef.current) {
+      setIsRunning(true);
       intervalRef.current = setInterval(() => setSeconds((prevSeconds) => (prevSeconds + 1)), 1000);
     }
   }
 
   function pause() {
-    if (intervalRef.current) {
-      clearInterval(intervalRef.current);
-      intervalRef.current = undefined;
-    }
+    clearIntervalRef();
   }
 
   function reset() {
@@ -44,6 +44,6 @@ export default function useStopwatch(settings) {
   }, []);
 
   return {
-    ...Time.getTimeFromSeconds(seconds), start, pause, reset,
+    ...Time.getTimeFromSeconds(seconds), start, pause, reset, isRunning,
   };
 }