import type { FormField, FormieFetchDataProps, FormiePagesProps } from '../types/FormTypes.js';
import type { ReCaptchaInstance } from 'recaptcha-v3';
/**
 * Überprüft die Bedingungen für ein Formularfeld und gibt `true` oder `false` zurück,
 * je nachdem, ob die Bedingungen erfüllt sind.
 *
 * @param {string} conditionsStr - JSON-String der Bedingungen des Feldes
 * @param {Array} formFields - Array der aktuellen Feldwerte
 * @returns {boolean} - `true`, wenn die Bedingungen erfüllt sind, sonst `false`
 */
export declare const checkFieldConditions: (conditionsStr: string | null, formFields: FormField[]) => boolean;
/**
 * Inserts or updates an object in an array based on its `handle` property.
 *
 * Searches the provided array for an object whose `handle` matches the
 * `handle` of the given element. If found, replaces that object in-place;
 * otherwise, appends the element to the end of the array.
 *
 * @param {Object[]} array - The array of objects to upsert into.
 * @param {{ [key: string]: string }} element - The object to insert or update.
 *   Must have a `handle` property of type string.
 * @returns {void}
 *
 * @example
 * const items = [
 *   { handle: 'foo', value: 'old' },
 *   { handle: 'bar', value: 'baz' }
 * ];
 *
 * upsert(items, { handle: 'foo', value: 'new' });
 * // items is now [ { handle: 'foo', value: 'new' }, { handle: 'bar', value: 'baz' } ]
 *
 * upsert(items, { handle: 'qux', value: 'added' });
 * // items is now [
 * //   { handle: 'foo', value: 'new' },
 * //   { handle: 'bar', value: 'baz' },
 * //   { handle: 'qux', value: 'added' }
 * // ]
 */
export declare const upsert: (array: any[], element: {
    [key: string]: string;
}) => void;
/**
 * @async addRecaptcha
 * @description
 * Adds recaptcha validation to the formData if a key is provided
 * @returns void
 */
export declare const addRecaptcha: (recaptcha: ReCaptchaInstance | undefined, formData: FormieFetchDataProps, recaptchaKey: string | undefined) => Promise<void>;
/**
 * @function areInputFieldsValid
 * @description checks the validity of all form fields of the current form page
 * @returns boolean
 */
export declare const areInputFieldsValid: (pages: FormiePagesProps[], pageIndex: number) => boolean;
/**
 * @function checkValidity
 * @description
 * Checks the validity form a passed in from HTML ELements Array
 * @param elems
 * @returns boolean
 */
export declare const checkValidity: (elems: (HTMLInputElement | HTMLSelectElement | HTMLTextAreaElement)[]) => boolean;
/**
 * @function isValidJSON
 * @description
 * checks if a string is valid json format
 *
 * @param input
 * @returns boolean
 */
export declare const isValidJSON: (input: string | undefined | null) => boolean;