import { type BusEvent } from '../orgrt/types.js';
export declare const FOLLOW_INTERVAL_MS = 500;
/** Incremental line reader: each call returns the complete lines appended to
 *  `file` since the previous call, reading only the new bytes. A trailing
 *  line without its newline yet is a mid-append partial write — it is held
 *  back until it parses as JSON (or its newline arrives). */
export declare function createLineTail(file: string): () => string[];
/** True once `run` can gain no more events. runtime.json records the run as
 *  stopped/crashed only after its bus is sealed; when runtime.json is about a
 *  newer run (or absent), the run's own terminal `org-stopped` status event —
 *  which every stop path emits — is the signal. */
export declare function isRunClosed(cwd: string, org: string, run: string, stopSeen: boolean): boolean;
/** Parsed tail of one run's bus.jsonl: `read()` returns new events (corrupt
 *  lines skipped), `closed()` reports whether the run has ended. */
export declare function tailRun(cwd: string, org: string, run: string): {
    read: () => BusEvent[];
    closed: () => boolean;
};
export type FollowEnd = 'closed' | 'signal' | 'consumer-gone' | 'orphaned';
/** Run `drain` every interval until: the parent process changes (we were
 *  re-parented, so our consumer is gone), stdout errors (EPIPE) or closes,
 *  SIGINT/SIGTERM/SIGHUP arrives, or `closed()` reports the run has ended
 *  (after one final drain). Every listener is removed when it stops. */
export declare function followUntilDone(drain: () => void, closed: () => boolean, intervalMs?: number): Promise<FollowEnd>;
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