/**
 * SDLoader Persistent Index
 *
 * Caches the results of package scanning to disk so that subsequent
 * startups don't need to rescan all packages (saves 2-4 seconds).
 *
 * The index is invalidated when:
 * - Any package manifest changes
 * - The index file is missing
 * - The index file version doesn't match
 *
 * Package directory mtimes are deliberately not used here. Container image
 * COPY operations may rewrite them even though the immutable package content
 * is unchanged, which would make a build-time index unusable at runtime.
 */
export interface PersistentIndexOptions {
    deduplicatePackages?: boolean;
}
/**
 * Load profile URLs from persistent index if valid
 * Returns null if index is missing, invalid, or outdated
 */
export declare function loadFromPersistentIndex(sourcePath: string, options?: PersistentIndexOptions): Promise<Set<string> | null>;
/**
 * Save profile URLs to persistent index
 */
export declare function saveToPersistentIndex(sourcePath: string, profileUrls: Set<string>, packageDetails: Array<{
    name: string;
    profileCount: number;
}>, options?: PersistentIndexOptions): Promise<void>;
/**
 * Clear the persistent index (force rescan on next startup)
 */
export declare function clearPersistentIndex(sourcePath: string): Promise<void>;
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