add function schema

src/renderer/utils/length.cljs

@@ -54,6 +54,7 @@
       n
       (if (valid-unit? unit) (->px n unit) 0))))
 
+(m/=> transform [:-> [:or string? number? nil?] ifn? [:* any?] string?])
 (defn transform
   "Converts a value to pixels, applies a function and converts the result
    back to the original unit."