@modular-forms/react/dist/types/validation/custom.d.ts

The modular and type-safe form library for React

import type { FieldValue, Maybe, MaybePromise } from '../types';
/**
 * Creates a custom validation function.
 *
 * @param requirement The validation function.
 * @param error The error message.
 *
 * @returns A validation function.
 */
export declare function custom<TFieldValue extends FieldValue>(requirement: (value: Maybe<TFieldValue>) => MaybePromise<boolean>, error: string): (value: Maybe<TFieldValue>) => Promise<string>;