/**
 * Background token refresh loop.
 * Runs in main wizard process, refreshes tokens before expiry,
 * writes to credentials file for proxy to read.
 */
export interface BackgroundRefreshOptions {
    /** AuthKit domain for refresh endpoint */
    authkitDomain: string;
    /** OAuth client ID */
    clientId: string;
    /** Check interval in ms (default: 30000) */
    intervalMs?: number;
    /** Refresh threshold in ms before expiry (default: 120000 = 2 min) */
    refreshThresholdMs?: number;
    /** Callback when refresh fails permanently */
    onRefreshExpired?: () => void;
    /** Callback when refresh succeeds */
    onRefreshSuccess?: () => void;
}
export interface BackgroundRefreshHandle {
    /** Stop the refresh loop */
    stop: () => void;
    /** Check if the loop is running */
    isRunning: () => boolean;
}
/**
 * Start background token refresh loop.
 */
export declare function startBackgroundRefresh(options: BackgroundRefreshOptions): BackgroundRefreshHandle;