/**
 * TEDL analytics events for Express Checkout.
 *
 * Pushes events onto window.tedl.events[] — the same mechanism as
 * @economist/tedl's emitTedlEvent — without the package dependency.
 * Avoids pulling a Node-targeted CJS bundle (crypto, sf-entitlement) into a
 * browser-only Web Component library.
 *
 * Event shape matches sma-checkout's pushTedlEvent schema:
 *   { name: 'user.journey', type: 'checkout', action, info: 'applepay', ...extra }
 *
 * Event names are aligned to the PRD spec (section 10 — Tracking & Analytics).
 */
declare global {
    interface Window {
        tedl?: {
            events?: Record<string, unknown>[];
            [key: string]: unknown;
        };
    }
}
export declare const EXPRESS_CHECKOUT_EVENTS: {
    /** Wallet button displayed */
    readonly IMPRESSION: "express_wallet_impression";
    /** Wallet button clicked */
    readonly BUTTON_CLICK: "express_wallet_click";
    /** Apple Pay sheet opened */
    readonly SHEET_OPEN: "wallet_payment_sheet_open";
    /** Payment authorised by the user in the Apple Pay sheet */
    readonly AUTHORISED: "wallet_payment_authorised";
    /** Purchase completed — BFF returned success */
    readonly SUCCESS: "wallet_payment_success";
    /** Payment failed — BFF returned error */
    readonly FAILURE: "wallet_payment_failure";
    /** Redirect to standard checkout (any fallback path) */
    readonly FALLBACK_CHECKOUT: "fallback_checkout";
};
/**
 * Metadata required for the wallet impression event.
 * Covers the 5 analytics dimensions from the PRD tracking spec:
 *   wallet_type, entry_point, offer_id (sku_id), country, device.
 */
export type ImpressionMetadata = {
    /** Entry point where the Apple Pay button appeared — e.g. 'article_paywall', 'homepage_banner'. */
    entryPoint: string;
    /** ISO 3166-1 alpha-2 country code of the offer (e.g. 'GB', 'US'). */
    country: string;
};
/** Wallet button displayed — emits all 5 required analytics dimensions. */
export declare const trackExpressWalletImpression: (skuId: string, { entryPoint, country }: ImpressionMetadata) => void;
/**
 * Optional metadata for the wallet click event.
 * `entry_point` is included only when provided so existing one-arg callers stay
 * payload-compatible.
 */
export type ClickMetadata = {
    /** Entry point where the Apple Pay button was clicked — e.g. 'free_trial_banner'. */
    entryPoint?: string;
};
/** Wallet button clicked */
export declare const trackExpressWalletClick: (skuId: string, { entryPoint }?: ClickMetadata) => void;
/** Apple Pay sheet opened (session.begin() called) */
export declare const trackWalletPaymentSheetOpen: (skuId: string) => void;
/** Payment authorised by the user in the Apple Pay sheet */
export declare const trackWalletPaymentAuthorised: (skuId: string) => void;
/** Purchase completed — BFF returned success */
export declare const trackWalletPaymentSuccess: (skuId: string, basketId: string) => void;
/** Payment failed — BFF returned an error */
export declare const trackWalletPaymentFailure: (skuId: string, reason: string) => void;
/** Redirect to standard checkout triggered */
export declare const trackFallbackCheckout: (skuId: string) => void;
/** Billing/shipping field failed validation (emitted per-field when Apple Pay sheet stays open) */
export declare const trackValidationFieldError: (field: string, errorType: string) => void;