import type { ScanFinding, CodeScanResult } from "./code_scanner.js";
export interface ScanCacheEntry {
    mtimeMs: number;
    size: number;
    findings: ScanFinding[];
}
export interface ScanCacheData {
    version: string;
    projectDir: string;
    lastScanned: string;
    entries: Record<string, ScanCacheEntry>;
}
export declare class ScanCache {
    private projectDir;
    constructor(projectDir: string);
    /**
     * Load existing cache.
     */
    load(): ScanCacheData;
    /**
     * Save cache.
     */
    save(data: ScanCacheData): void;
    /**
     * Determine which files need scanning by comparing mtime/size against cache.
     * Returns files that are new or changed.
     */
    getStaleFiles(files: string[], cache: ScanCacheData): {
        stale: string[];
        cachedFindings: ScanFinding[];
    };
    /**
     * Update cache entries for freshly scanned files.
     */
    updateEntries(cache: ScanCacheData, scannedFiles: string[], findings: ScanFinding[]): void;
    /**
     * Merge cached and fresh results into a single CodeScanResult.
     */
    mergeResults(freshResult: CodeScanResult, cachedFindings: ScanFinding[]): CodeScanResult;
    private _empty;
}
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