/**
 * Discovery cache for incremental rebuilds.
 *
 * Tracks file mtimes and file→entity mappings so that only changed files
 * need to be re-imported during watch-mode rebuilds.
 */
export declare class DiscoveryCache {
    private files;
    /**
     * Check if a file has changed since it was last tracked.
     * Returns true if the file is new or its mtime has changed.
     */
    hasFileChanged(filePath: string): boolean;
    /**
     * Record a successful import, storing the file's mtime and entity names.
     */
    trackFileImport(filePath: string, mtime: number, entityNames: string[]): void;
    /**
     * Invalidate cache entries for the given files.
     * Returns the set of entity names that were invalidated.
     */
    invalidate(changedFiles: string[]): Set<string>;
    /**
     * Get all tracked file paths.
     */
    trackedFiles(): string[];
    /**
     * Get entity names for a tracked file.
     */
    getFileEntities(filePath: string): string[] | undefined;
    /**
     * Clear all cached data.
     */
    clear(): void;
}
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