import { TOpenOptions } from '../apis/App';
import { CheckoutConfig } from '../interfaces/CheckoutConfig';
export declare enum CALLBACK_MODE_ENUM {
    handler = "callback_handler",
    redirect = "callback_url_redirect",
    noredirect = "callback_url_noredirect"
}
export declare enum PAYMENT_MODE_ENUM {
    'net_banking' = "Netbanking",
    'wallet' = "Wallet",
    'card' = "Cards",
    'upi' = "UPI",
    'emi' = "EMI"
}
export type TPaymentModes = keyof typeof PAYMENT_MODE_ENUM;
type PaymentModeCodes = `${PAYMENT_MODE_ENUM}`;
/**
 * list of all the util functions used in `App.js`
 * to open checkout
 */
declare class AppUtil {
    static readonly CUSTOM_PROPERTY_MAX_LENGTH = 5000;
    /**
     * PS-1599: the origin of `checkoutHost`, or null if it is not a usable absolute URL.
     * `event.origin` is always scheme://host[:port] with no trailing slash and no path,
     * so this is the only value it may be compared against.
     */
    private static resolveExpectedOrigin;
    /**
     * PS-1609: any page may post any payload to the merchant window, so `data` is
     * untrusted input. Returns null for anything that is not a JSON object carrying a
     * string event_type, rather than letting a throw escape into the message handler.
     */
    private static parseCheckoutMessage;
    static validateOptions: (samunnayaUrl: string, options: TOpenOptions, commonTrackingData: any) => void;
    static getPaymentModeCode: (mode: TPaymentModes | undefined) => PaymentModeCodes | null;
    static generateCheckoutUrl: (options: TOpenOptions & typeof CheckoutConfig & {
        paymentMode: PaymentModeCodes | null;
    }) => Promise<string>;
    static openIframe: (checkoutUrl: string) => HTMLIFrameElement;
    /**
     * PS-1613: the single message listener owned by this class, so that a second
     * open() cannot stack another one on top of it.
     */
    private static activeMessageHandler;
    static removeCloseListener: () => void;
    static addCloseListener: (options: {
        checkoutHost: string | undefined;
        callbackHandler: (response: unknown) => void;
        commonTrackingData: any;
    }, samunnayaUrl: string, checkoutFrame?: HTMLIFrameElement | null) => void;
}
export default AppUtil;