/**
 * Watcher backend abstraction.
 *
 * Decouples the orchestration logic in watcher.ts from the underlying
 * filesystem-watching library.  Swap backends by providing a different
 * WatcherBackend implementation — no changes needed in watcher.ts.
 */
export interface RawWatchEvent {
    type: 'create' | 'update' | 'delete';
    path: string;
}
export interface WatcherBackendOptions {
    ignoreGlobs: string[];
}
export interface WatcherSubscription {
    readonly id: string;
}
export interface WatcherBackend {
    subscribe(dir: string, callback: (events: RawWatchEvent[]) => void, options: WatcherBackendOptions): Promise<WatcherSubscription>;
    initialScan(dir: string, callback: (events: RawWatchEvent[]) => void, options: WatcherBackendOptions): Promise<void>;
    unsubscribe(subscription: WatcherSubscription): Promise<void>;
}
export declare class ParcelWatcherBackend implements WatcherBackend {
    private subs;
    private nextSubId;
    subscribe(dir: string, callback: (events: RawWatchEvent[]) => void, options: WatcherBackendOptions): Promise<WatcherSubscription>;
    initialScan(dir: string, callback: (events: RawWatchEvent[]) => void, options: WatcherBackendOptions): Promise<void>;
    unsubscribe(subscription: WatcherSubscription): Promise<void>;
}
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