/**
 * Label Service Headless Pool
 * Using the unified headless pool system from @things-factory/shell
 */
type LabelJob = {
    subdomain?: string;
    token?: string;
};
/**
 * The headers a sub-request goes with: the job's user and domain, for a request to this server while a job runs;
 * nothing for any other host, or between jobs.
 */
export declare function labelRequestHeaders(requestUrl: string, origin: string, job: LabelJob | undefined, existing: Record<string, string>): Record<string, string> | undefined;
/** Runs one label job on a page as the requesting user in their domain; the page forgets them when it is done. */
export declare function forLabelJob<T>(page: object, who: {
    domain?: {
        subdomain?: string;
    };
    user?: {
        sign?: () => Promise<string> | string;
    };
}, work: () => Promise<T>): Promise<T>;
export declare function setupLabelPage(browser: any): Promise<{
    browser: any;
    page: any;
}>;
/**
 * Get the label headless pool
 * @returns Pool instance with acquire/release methods
 */
export declare function getHeadlessPool(): {
    acquire: () => Promise<any>;
    release: (resource: any) => Promise<void>;
    size: number;
    available: number;
    borrowed: number;
    pending: number;
    max: number;
    min: number;
    clear: () => Promise<void>;
};
export {};