import { type AuthStorage } from "../auth-storage";
export interface AuthBrokerRefresherOptions {
    storage: AuthStorage;
    /** Refresh credentials expiring within this window. Default 5 min. */
    refreshSkewMs?: number;
    /** Loop cadence. Default 60s. */
    refreshIntervalMs?: number;
    /** Override clock (tests). */
    now?: () => number;
}
export interface AuthBrokerRefresherSchedule {
    enabled: boolean;
    intervalMs: number;
    skewMs: number;
    nextSweepAt: number;
}
export declare class AuthBrokerRefresher {
    #private;
    constructor(opts: AuthBrokerRefresherOptions);
    start(): void;
    stop(): void;
    getSchedule(): AuthBrokerRefresherSchedule;
    /** Run one sweep. Exposed for tests. */
    tick(): Promise<void>;
}