Update adding-interactivity.md

Declare interval variable timer before use.
denoland · Jan 4, 2025 · dbc31d6 · dbc31d6
1 parent 70d6cbd
commit dbc31d6
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/docs/latest/getting-started/adding-interactivity.md b/docs/latest/getting-started/adding-interactivity.md
@@ -43,7 +43,8 @@ export default function Countdown(props: { target: string }) {
   // Set up an interval to update the `now` date every second with the current
   // date as long as the component is mounted.
   useEffect(() => {
-    const timer = setInterval(() => {
+    let timer: number = -1;
+    timer = setInterval(() => {
       if (now.value > target) {
         clearInterval(timer);
       }