boonya/react-hook-form-validation

import { ValidatorFuncParams, ValidatorAsyncFuncParams, AsyncValidatorResult, Func, AsyncFunc, ValidatorCommonParams, VALIDATORS } from '../types';
import { createValidatorResult } from '../helpers';

export default function create(func: Func | AsyncFunc, props: ValidatorCommonParams = {}) {
    return { validator: VALIDATORS.func, func, ...props };
}

export async function isValid(input: unknown, { func, ...messages }: ValidatorAsyncFuncParams | ValidatorFuncParams): AsyncValidatorResult {
    const result = await func(input);

    let valid;
    let payload: unknown[] = [];
    if (result === true || result === false) {
        valid = result;
    }
    else if (Array.isArray(result) && result.length > 0) {
        [valid, ...payload] = result;
    }
    else {
        throw new TypeError('Your function returned unexpected value');
    }

    return createValidatorResult(valid, messages, [{ input, payload }]);
}