/**
 * Derive the Claude Code project directory hash from DATA_DIR.
 * Claude Code encodes project directories by replacing '/' and '.' with '-'.
 * e.g. /home/user/.cortex → -home-user--cortex
 */
declare function getProjectHash(): string;
/**
 * Get the path to a Claude Code session JSONL file.
 */
declare function getSessionFilePath(sessionId: string): string;
/** Find a PI transcript from its exact id-bearing filename without opening JSONL bodies. */
declare function findPISessionFile(sessionId: string, sessionDir?: string): Promise<string | null>;
/** Create `<filePath>.turn-<turnIndex>.bak` without blocking the event loop. */
declare function backupSessionFile(filePath: string, turnIndex: number): Promise<string | null>;
/** Derive the exact transcript path encoded by a recorded turn backup. */
declare function sessionFileFromBackupPath(backupPath: string, turnIndex: number): string | null;
/** Restore from an immutable backup pathname recorded in the conversation ledger. */
declare function restoreSessionBackup(backupPath: string, turnIndex: number): Promise<boolean>;
/** Restore a session file from a turn backup without blocking the event loop. */
declare function restoreSessionFile(filePath: string, turnIndex: number): Promise<boolean>;
/**
 * Delete backups for turns strictly after the given index for a specific session file.
 * Backups are named `<basename>.turn-<N>.bak`.
 */
declare function cleanupBackupsForFile(filePath: string, afterTurnIndex: number): void;
declare function cleanupAllBackupsForFile(filePath: string): void;
/**
 * Create a backup of the session file before processing a turn.
 * Returns the backup path, or null if the session file doesn't exist yet.
 */
declare function createBackup(sessionId: string, turnIndex: number): Promise<string | null>;
declare function restoreBackup(sessionId: string, turnIndex: number): Promise<boolean>;
/**
 * Delete all backup files for a session.
 * Called on !new to clean up.
 */
declare function cleanupAllBackups(sessionId: string): void;
/**
 * Delete backups for turns strictly after the given index.
 * Called after rollback to remove invalidated backups.
 */
declare function cleanupBackupsAfter(sessionId: string, afterTurnIndex: number): void;
export { getSessionFilePath, createBackup, restoreBackup, cleanupAllBackups, cleanupBackupsAfter, getProjectHash, findPISessionFile, backupSessionFile, restoreSessionFile, restoreSessionBackup, sessionFileFromBackupPath, cleanupBackupsForFile, cleanupAllBackupsForFile, };