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Update adding-interactivity.md #2804

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Update adding-interactivity.md #2804

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3 changes: 2 additions & 1 deletion docs/latest/getting-started/adding-interactivity.md
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Original file line number Diff line number Diff line change
Expand Up @@ -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);
}
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