/** Which part comes first in a composed title. */
export type TitleOrder = 'page-first' | 'site-first';
type ComposeTitleArgs = {
    /** Page-specific title, e.g. 'About Us'. */
    pageTitle?: string | null;
    /** Site name, e.g. 'Acme Inc'. */
    siteName?: string | null;
    /** Separator between page title and site name. Defaults to ' | '. */
    separator?: string;
    /** Defaults to 'page-first' — the page title is what a visitor scans for. */
    order?: TitleOrder;
};
/**
 * Composes a full document title from a page title and the site name.
 *
 * - both, page-first:  "About Us | Acme Inc"
 * - both, site-first:  "Acme Inc | About Us"
 * - page only:         "About Us"
 * - site only:         "Acme Inc"
 * - neither:           ""
 *
 * Pure function — no dependency on Payload or request state.
 */
export declare function composeTitle({ pageTitle, siteName, separator, order, }: ComposeTitleArgs): string;
export {};