import { IncrementalIndexOptions, IncrementalIndexStats } from './types';
export declare class IncrementalIndexer {
    private readonly repoRoot;
    private readonly options;
    private hashCache;
    constructor(repoRoot: string, options?: IncrementalIndexOptions);
    /**
     * Returns list of all source files in the repo (streaming via glob, never all contents in memory).
     */
    discoverFiles(): string[];
    /**
     * Returns only files that have changed since last index (hash comparison).
     * Also identifies files removed from disk but present in cache.
     */
    getChangedFiles(allFiles: string[]): {
        changed: string[];
        removed: string[];
        unchanged: number;
    };
    /**
     * Process files in chunks, never loading more than chunkSize at once.
     * Returns stats about the indexing run.
     */
    runIncrementalIndex(processChunk: (files: Array<{
        path: string;
        content: string;
        hash: string;
    }>) => void): Promise<IncrementalIndexStats>;
    /**
     * Update hash cache after successful processing.
     */
    commitHashCache(processedFiles: Map<string, string>): void;
    /**
     * Load cached hashes from disk.
     */
    private loadHashCache;
    /**
     * Save hash cache atomically (write to temp file, then rename).
     */
    private saveHashCache;
    /**
     * Get current RSS memory in MB.
     */
    private getRSSMB;
}
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