export type ReleaseRefreshLease = () => void;
export interface RefreshLeaseOptions {
    /** Internal test seam. Production uses process.kill(pid, 0). */
    isProcessAlive?: (pid: number) => boolean;
    /** Internal test seam for retry timing. */
    retryMinMs?: number;
    /** Internal test seam for retry timing. */
    retryMaxMs?: number;
    /** Stops an asynchronous lease wait when its watcher is shutting down. */
    signal?: AbortSignal;
}
export declare function tryAcquireRefreshLease(outputDir: string, options?: RefreshLeaseOptions): ReleaseRefreshLease | null;
export declare function acquireRefreshLease(outputDir: string, options?: RefreshLeaseOptions & {
    timeoutMs?: number;
}): ReleaseRefreshLease;
/**
 * Waits for the active refresh owner without imposing a terminal contention
 * timeout. The caller's AbortSignal remains the bounded shutdown mechanism.
 */
export declare function acquireRefreshLeaseWithoutBlocking(outputDir: string, options?: RefreshLeaseOptions): Promise<ReleaseRefreshLease | null>;