Arrow functions and so

Signed-off-by: marcin mikołajczak <git@mkljczk.pl>

src/hooks/forms/usePreview.ts

@@ -1,12 +1,10 @@
 import { useMemo } from 'react';
 
 /** Return a preview URL for a file. */
-function usePreview(file: File | null | undefined): string | undefined {
-  return useMemo(() => {
-    if (file) {
-      return URL.createObjectURL(file);
-    }
-  }, [file]);
-}
+const usePreview = (file: File | null | undefined): string | undefined => useMemo(() => {
+  if (file) {
+    return URL.createObjectURL(file);
+  }
+}, [file]);
 
 export { usePreview };