Convert usePrevious hook to TypeScript. (#35597)

packages/compose/src/hooks/use-previous/index.ts

@@ -0,0 +1,24 @@
+/**
+ * WordPress dependencies
+ */
+import { useEffect, useRef } from '@wordpress/element';
+
+/**
+ * Use something's value from the previous render.
+ * Based on https://usehooks.com/usePrevious/.
+ *
+ * @param  value The value to track.
+ *
+ * @return The value from the previous render.
+ */
+export default function usePrevious< T >( value: T ): T | undefined {
+	const ref = useRef< T >();
+
+	// Store current value in ref.
+	useEffect( () => {
+		ref.current = value;
+	}, [ value ] ); // Re-run when value changes.
+
+	// Return previous value (happens before update in useEffect above).
+	return ref.current;
+}