/**
 * Cleanup — orphaned per-project data pruning (--data): ~/.monomind/projects
 * dirs and ~/.monomind-projects.json registry entries whose project is gone.
 * Extracted from cleanup.ts.
 */
import type { StaleScratchItem } from './cleanup-scratch.js';
/**
 * Entries of the project registry (~/.monomind-projects.json, written by
 * `init` for `init upgrade --all`) whose project was deleted, by the same rule
 * as project-data dirs. Exported for tests; unreadable registry → none.
 */
export declare function findStaleRegistryEntries(registryPath: string): string[];
/** Rewrite the registry without `stale`, re-read first so a concurrent `init` registration survives. */
export declare function pruneRegistryEntries(registryPath: string, stale: string[]): number;
/**
 * Find prunable entries under the per-project data base (default
 * ~/.monomind/projects). Exported for tests — `baseDir`/`now` injectable.
 *
 * Classification per dir:
 * - `origin.json` present and its recorded path still exists → keep the dir,
 *   but flag a leftover `lancedb/` subdir (dead since the SQLite engine swap).
 * - `origin.json` present, recorded path provably deleted (not merely on an
 *   unmounted volume, see {@link isProvablyDeleted}) → orphaned → prune.
 * - no `origin.json` (pre-2.3.1 dirs can't prove their origin) → prune only
 *   when untouched for {@link UNKNOWN_DIR_MAX_AGE_MS} — or immediately with
 *   `--aggressive`, which treats unprovable dirs as junk (safe: every live
 *   project rewrites origin.json on its next memory access).
 */
export declare function findOrphanedProjectData(baseDir: string, now: number, aggressive: boolean): StaleScratchItem[];
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