first commit

calcom/packages/core/components/NoSSR.tsx

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+import { useState, useEffect } from "react";
+
+interface Props {
+  children: React.ReactNode; // React.ReactNode
+  fallback?: JSX.Element | null; // JSX.Element
+}
+
+const NoSSR = ({ children, fallback = null }: Props) => {
+  const [mounted, setMounted] = useState(false);
+
+  useEffect(() => setMounted(true), []);
+
+  if (!mounted) {
+    return fallback;
+  }
+
+  return <>{children}</>;
+};
+
+export default NoSSR;