/**
 * Enhanced Conversions helper.
 *
 * Hashes user-provided PII (email/phone/name/address) with SHA-256 before
 * it leaves the browser, matching Google Ads' Enhanced Conversions format:
 * https://support.google.com/google-ads/answer/13258081
 *
 * Returns an object suitable for `gtag('set', 'user_data', { ... })`.
 */
export interface RawUserData {
    email?: string | null;
    phone?: string | null;
    first_name?: string | null;
    last_name?: string | null;
    street?: string | null;
    city?: string | null;
    region?: string | null;
    postal_code?: string | null;
    country?: string | null;
}
export interface HashedUserAddress {
    sha256_first_name?: string;
    sha256_last_name?: string;
    sha256_street?: string;
    city?: string;
    region?: string;
    postal_code?: string;
    country?: string;
}
export interface HashedUserData {
    sha256_email_address?: string;
    sha256_phone_number?: string;
    address?: HashedUserAddress;
}
export declare function buildHashedUserData(raw: RawUserData): Promise<HashedUserData | null>;