import { EventEmitter } from "node:events";
/**
 * StatPoller periodically stats a single file and emits 'change' when its
 * identity (inode), size, or modification time differs from the last
 * observation.
 *
 * It exists as a fallback for environments where native file-system events
 * are not delivered: cloud-synced folders (OneDrive, Dropbox, Google Drive)
 * updated from another machine, and network / WSL drvfs (9p) mounts that
 * never emit inotify events for changes made on the host side.
 *
 * A directory path is not polled: directory mtime only tracks entry
 * add/remove, not content edits, so it would produce noise without value.
 *
 * Events:
 * - 'change' (path): the file's stat signature changed since the last tick
 * - 'error' (error): stat failed for a reason other than ENOENT
 */
export declare class StatPoller extends EventEmitter {
    private readonly filePath;
    private readonly intervalMs;
    private timer;
    private lastSignature;
    private tickInFlight;
    constructor(filePath: string, intervalMs: number);
    /**
     * Seed the baseline signature and begin polling.
     * Resolves without starting when the path is a directory.
     */
    start(): Promise<void>;
    stop(): void;
    isRunning(): boolean;
    getIntervalMs(): number;
    private tick;
}
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