export declare const OWNER_RENEWAL_WINDOW_MS = 90000;
export interface OwnerRenewalSession {
    token: string;
    expiresAt: number;
}
export type OwnerRenewalHandler = () => Promise<OwnerRenewalSession>;
/** Installs the desktop window's memory-only owner renewal broker. */
export declare function setOwnerRenewalHandler(next: OwnerRenewalHandler | null): void;
/** Returns whether the current runtime can renew a remote owner session. */
export declare function hasOwnerRenewalHandler(): boolean;
/** Renews once for all concurrent callers. */
export declare function renewOwnerSession(): Promise<OwnerRenewalSession>;
/** Returns delay until proactive renewal, bounded at zero. */
export declare function ownerRenewalDelay(expiresAt: number, now?: number): number;
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