fix types for TextField validate props (#3160)

* fix types for TextField `validate` props

* Fix PR TS errors

---------

Co-authored-by: Ethan Sharabi <[email protected]>

Author: ipanasenko

demo/src/screens/componentScreens/NumberInputScreen.tsx

@@ -111,6 +111,7 @@ const NumberInputScreen = () => {
     if (currentData.current?.type === 'valid') {
       return currentData.current.number > MINIMUM_PRICE;
     }
+    return false;
   }, []);
 
   const isWithinDiscountPercentage = useCallback(() => {
@@ -119,6 +120,7 @@ const NumberInputScreen = () => {
         currentData.current.number >= DISCOUNT_PERCENTAGE.min && currentData.current.number <= DISCOUNT_PERCENTAGE.max
       );
     }
+    return false;
   }, []);
 
   const validate = useMemo((): Incubator.TextFieldProps['validate'] => {

src/components/textField/types.ts

@@ -37,7 +37,7 @@ export enum Presets {
 
 export type ValidationMessagePositionType = `${ValidationMessagePosition}` | ValidationMessagePosition;
 
-export type Validator = Function | keyof typeof formValidators;
+export type Validator = ((value?: string) => boolean) | keyof typeof formValidators;
 
 export interface FieldStateProps extends InputProps {
   validateOnStart?: boolean;