/**
 * Structural Index Module
 * Caches file metadata, builds dependency graphs, and clusters related files
 * for more efficient and accurate code analysis.
 *
 * Key features:
 * - File hashing for change detection
 * - Import/export extraction for dependency tracking
 * - Dependency graph construction
 * - File clustering for grouped analysis
 * - Persistent caching to ~/.rlm-analyzer/cache/
 */
import type { StructuralIndex, StructuralIndexOptions, FileIndexEntry, DependencyEdge, FileCluster, FileChunk } from './types.js';
/**
 * Calculate SHA-256 hash of file content
 */
export declare function hashContent(content: string): string;
/**
 * Calculate hash for a project directory (based on file paths and mtimes)
 */
export declare function hashProject(directory: string): string;
/**
 * Extract imports from file content
 */
export declare function extractImports(content: string, ext: string): string[];
/**
 * Extract exports from file content
 */
export declare function extractExports(content: string, ext: string): string[];
/**
 * Check if a file needs chunking
 */
export declare function needsChunking(size: number, maxSize?: number): boolean;
/**
 * Chunk a large file by lines
 */
export declare function chunkFile(content: string, chunkSize?: number): FileChunk[];
/**
 * Build dependency graph from file index
 */
export declare function buildDependencyGraph(fileIndex: Record<string, FileIndexEntry>): DependencyEdge[];
/**
 * Build file clusters from dependency graph
 */
export declare function buildClusters(fileIndex: Record<string, FileIndexEntry>, edges: DependencyEdge[]): FileCluster[];
/**
 * Get cache path for a project
 */
export declare function getCachePath(directory: string): string;
/**
 * Load cached index if valid
 */
export declare function loadCachedIndex(directory: string): StructuralIndex | null;
/**
 * Save index to cache
 */
export declare function saveIndexToCache(index: StructuralIndex): void;
/**
 * Clear cache for a project
 */
export declare function clearCache(directory: string): void;
/**
 * Build or update structural index for a directory
 */
export declare function buildStructuralIndex(directory: string, options?: StructuralIndexOptions): Promise<StructuralIndex>;
/**
 * Update index with changed files only
 */
export declare function updateStructuralIndex(directory: string, options?: StructuralIndexOptions): Promise<{
    index: StructuralIndex;
    changedFiles: string[];
}>;
/**
 * Get files that depend on a given file
 */
export declare function getDependents(index: StructuralIndex, filePath: string): string[];
/**
 * Get files that a given file depends on
 */
export declare function getDependencies(index: StructuralIndex, filePath: string): string[];
/**
 * Get the cluster containing a file
 */
export declare function getFileCluster(index: StructuralIndex, filePath: string): FileCluster | undefined;
/**
 * Get files ordered by analysis priority (entry points first)
 */
export declare function getAnalysisPriority(index: StructuralIndex): string[];
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