import type { ScanCache, DetectionSignal } from './types';
export declare class CacheManager {
    private cache;
    constructor(data?: ScanCache);
    /** Check if a file's cached signals are still valid (mtime unchanged) */
    get(filePath: string, currentMtime: number): DetectionSignal[] | null;
    /** Store signals for a file */
    set(filePath: string, mtime: number, signals: DetectionSignal[]): void;
    /** Remove entries for files that no longer exist */
    prune(existingPaths: Set<string>): number;
    /** Update last scan timestamp */
    touch(): void;
    /** Export cache for persistence */
    serialize(): ScanCache;
    get lastScanAt(): number | undefined;
    get entryCount(): number;
}
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