/**
 * Filter to identify and reject low-quality code chunks
 * Prevents indexing trivial/boilerplate chunks that pollute search results
 */
import type { CodeBlock } from '../types/models.js';
export interface ChunkQualityMetrics {
    isHighQuality: boolean;
    score: number;
    reasons: string[];
}
/**
 * Analyzes chunk quality to filter out trivial/boilerplate content
 */
export declare class ChunkQualityFilter {
    private readonly MIN_QUALITY_SCORE;
    private readonly CLOSING_TAG_THRESHOLD;
    /**
     * Determine if a chunk is high enough quality to index
     */
    isHighQuality(block: CodeBlock): boolean;
    /**
     * Analyze chunk quality with detailed scoring
     */
    analyzeQuality(block: CodeBlock): ChunkQualityMetrics;
    /**
     * Calculate ratio of meaningful content vs whitespace/syntax
     */
    private getMeaningfulContentRatio;
    /**
     * Calculate character diversity (unique chars / total chars)
     */
    private getCharacterDiversity;
    /**
     * Count meaningful tokens (identifiers, keywords, strings)
     */
    private countMeaningfulTokens;
    /**
     * Check if chunk is just closing tags/braces
     */
    private isJustClosingTags;
    /**
     * Get quality bonus based on block type
     */
    private getTypeQualityBonus;
    /**
     * Get quality score based on code length
     */
    private getLengthQualityScore;
    /**
     * Get statistics about filtered chunks
     */
    getFilterStats(blocks: CodeBlock[]): {
        total: number;
        filtered: number;
        kept: number;
        averageScore: number;
    };
}
export declare const chunkQualityFilter: ChunkQualityFilter;
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