/**
 * Single-flight, debounced batcher between the filesystem watcher and the indexer.
 *
 * Watcher events arrive in bursts (editors write temp+rename, Dropbox syncs whole
 * directories). The scheduler coalesces a burst into one batch of unique paths and
 * guarantees the runner is never invoked concurrently with itself: events that land
 * while a run is in flight are queued and processed in one follow-up run.
 */
export interface IndexScheduler {
    /** Queue a path for (re)indexing. Duplicate paths within a batch collapse. */
    schedule(relativePath: string): void;
    /** Resolves once no run is in flight, no timer is armed, and nothing is queued. */
    idle(): Promise<void>;
    /** Cancels pending work and waits for any in-flight run to finish. */
    close(): Promise<void>;
}
export declare function createIndexScheduler(run: (paths: string[]) => Promise<void>, debounceMs?: number): IndexScheduler;