import { FieldPath, FieldValues, PathValue, UseControllerReturn } from 'react-hook-form';
export type Transform<OnChange extends ((...args: any[]) => void) | undefined, TTransformedValue, TFieldValues extends FieldValues = FieldValues, TName extends FieldPath<TFieldValues> = FieldPath<TFieldValues>> = {
    input?: (value: PathValue<TFieldValues, TName>) => TTransformedValue;
    output?: (...args: [...Parameters<NonNullable<OnChange>>, previousValue: TTransformedValue]) => PathValue<TFieldValues, TName>;
};
/**
 * Props for the `useTransform` hook.
 */
export type UseTransformProps<TTransformedValue, TFieldValues extends FieldValues = FieldValues, TName extends FieldPath<TFieldValues> = FieldPath<TFieldValues>> = {
    /**
     * The `onChange` function from the `react-hook-form` controller.
     */
    onChange: UseControllerReturn<TFieldValues, TName>['field']['onChange'];
    /**
     * Optional transformation functions for input and output values.
     */
    transform?: Transform<(...args: any[]) => PathValue<TFieldValues, TName>, TTransformedValue, TFieldValues, TName>;
    /**
     * The current value of the field from the `react-hook-form` controller.
     */
    value: UseControllerReturn<TFieldValues, TName>['field']['value'];
};
/**
 * Return type of the `useTransform` hook.
 */
export type UseTransformReturn<TTransformedValue, TFieldValues extends FieldValues = FieldValues, TName extends FieldPath<TFieldValues> = FieldPath<TFieldValues>> = {
    /**
     * The transformed `onChange` function.
     */
    onChange: UseControllerReturn<TFieldValues, TName>['field']['onChange'];
    /**
     * The transformed value.
     */
    value: TTransformedValue;
};
/**
 * A custom hook to transform the `value` and `onChange` handler of a form field.
 *
 * @param props - The props for the hook.
 * @returns An object containing the transformed `onChange` handler and `value`.
 */
export declare function useUnstableTransform<TTransformedValue, TFieldValues extends FieldValues = FieldValues, TName extends FieldPath<TFieldValues> = FieldPath<TFieldValues>>(props: UseTransformProps<TTransformedValue, TFieldValues, TName>): UseTransformReturn<TTransformedValue, TFieldValues, TName>;