/**
 * Incremental TF-IDF Index Manager
 * Efficiently updates TF-IDF vectors without full rebuild
 */
import type { DocumentVector } from './tfidf.js';
export interface IncrementalUpdate {
    type: 'add' | 'update' | 'delete';
    uri: string;
    oldDocument?: DocumentVector;
    newContent?: string;
}
export interface IncrementalStats {
    totalDocuments: number;
    affectedDocuments: number;
    affectedTerms: number;
    updateTime: number;
}
/**
 * Incremental TF-IDF Index Manager
 *
 * ALGORITHM:
 * 1. Track document frequency (df) for each term
 * 2. When document changes:
 *    - Update df for affected terms
 *    - Recalculate IDF for affected terms
 *    - Update TF-IDF only for affected documents
 * 3. Avoid full rebuild unless necessary
 */
export declare class IncrementalTFIDF {
    private documents;
    private idf;
    private documentFrequency;
    private totalDocuments;
    constructor(initialDocuments?: DocumentVector[], initialIdf?: Map<string, number>);
    /**
     * Apply multiple updates efficiently
     */
    applyUpdates(updates: IncrementalUpdate[]): Promise<IncrementalStats>;
    /**
     * Add a new document
     */
    private addDocumentInternal;
    /**
     * Update an existing document
     */
    private updateDocumentInternal;
    /**
     * Delete a document
     */
    private deleteDocumentInternal;
    /**
     * Extract terms from content (async - uses StarCoder2)
     */
    private extractTerms;
    /**
     * Calculate TF for a document
     */
    private calculateTF;
    /**
     * Recalculate TF-IDF for a document
     */
    private recalculateDocumentTFIDF;
    /**
     * Get current index state
     */
    getIndex(): {
        documents: DocumentVector[];
        idf: Map<string, number>;
        totalDocuments: number;
    };
    /**
     * Check if full rebuild is recommended
     * Returns true if changes are too extensive for incremental update
     */
    shouldFullRebuild(updates: IncrementalUpdate[]): Promise<boolean>;
}
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