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Change the source and the output beside it follows.

For agentsUpdated 2026-10-21

Change the source and the output beside it follows. This is the compiler the build uses, running in your browser as WebAssembly.

Counter.tsxtsx

import { useStore } from "@shadow-js/core";

export function Counter() {
  const [count, setCount] = useStore(0);
  return (
    <button type="button" class="counter" onClick={() => setCount((n) => n + 1)}>
      Clicked {count()} times
    </button>
  );
}