import type { TranscriptTurn, TranscriptLine } from './types.js';
/**
 * Resolve the JSONL file path for a session transcript.
 * Creates the transcripts directory if it doesn't exist.
 */
export declare function getTranscriptPath(transcriptsDir: string, sessionId: string): string;
/**
 * Append a single turn to a session transcript (sync, append-only).
 * Creates the file and directory if they don't exist.
 */
export declare function appendTurn(transcriptsDir: string, sessionId: string, line: TranscriptLine): void;
/**
 * Read all turns from a session transcript.
 * Assigns turn_number from line index (1-indexed).
 * Returns empty array if file doesn't exist or is empty.
 */
export declare function readTranscript(transcriptsDir: string, sessionId: string): TranscriptTurn[];
/**
 * List all session IDs that have transcripts.
 * Returns session IDs sorted by file modification time (newest first).
 */
export declare function listTranscripts(transcriptsDir: string): string[];
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