import * as Handlebars from "handlebars";
/**
 * Renders a date or ISO 8601 string as "9 August 2026 at 14:32 UTC".
 *
 * Handlebars passes its options object as the final argument, so any leading
 * string in `rest` is the caller's timezone override. UTC is the default: the
 * recipient's zone is unknown at send time, and labelling the zone is honest
 * where silently using the server's zone is not.
 */
export declare function formatDateTimeHelper(value: unknown, ...rest: unknown[]): string;
/**
 * Registers every helper the email templates may use.
 *
 * Extracted from the EmailService constructor so consuming apps can register
 * the identical set when rendering templates outside the service (e.g. tests).
 */
export declare function registerEmailTemplateHelpers(handlebars: typeof Handlebars): void;
//# sourceMappingURL=email.helpers.d.ts.map