export interface TranscriptTailer {
    stop(): void;
}
export interface TailTranscriptOpts {
    /** Poll interval backstopping fs.watch (which can miss the first appends on
     *  freshly-created files — and the file often doesn't exist when we attach). */
    pollMs: number;
    /** Engine label for the read-failure log line (e.g. "Codex", "antigravity"). */
    label: string;
}
/**
 * Tail a transcript JSONL from `startOffset`, invoking `onLine` for each complete
 * appended line. Shared by the codex and antigravity interactive engines (which
 * detect turn boundaries from their CLIs' on-disk transcripts — no hook system).
 *
 * Combines fs.watch with interval polling; handles partial-line buffering and
 * file-handle recovery on read errors. Concurrent wake-ups during a read are
 * coalesced into one follow-up pass (`pending`) so no append is left waiting for
 * the next poll tick.
 */
export declare function tailTranscriptLines(filePath: string, startOffset: number, onLine: (line: string) => void, opts: TailTranscriptOpts): TranscriptTailer;
//# sourceMappingURL=transcript-tailer.d.ts.map