/**
 * Content quality analyzer.
 *
 * Ported from the Python `content_quality.py` in claude-seo. Pure heuristic
 * analysis: filler phrase detection, AI-pattern detection, information density,
 * and repetition scoring. No external API calls.
 */
import type { ContentQualityResult, HeadingInfo, PageData, SchemaBlock } from "../types.js";
/** Split text into sentences, respecting common abbreviations. */
export declare function splitSentences(text: string): string[];
/** Calculate Flesch-Kincaid Grade Level and related readability metrics. */
export declare function calculateReadability(text: string): {
    fleschKincaid: number;
    sentenceCount: number;
    avgSentenceLength: number;
    avgWordLength: number;
};
/** Extract named entities from text using proper noun heuristics. */
export declare function extractEntities(text: string, schemaBlocks?: SchemaBlock[]): string[];
/** Check whether heading keywords appear in body text. */
export declare function headingContentAlignment(headings: HeadingInfo[], bodyText: string, stopWords?: Set<string>): {
    score: number;
    missingKeywords: string[];
};
/** Evaluate heading structure depth and completeness. */
export declare function calculateSemanticDepth(headings: HeadingInfo[]): {
    score: number;
    hasH1: boolean;
    hasH2: boolean;
    hasH3: boolean;
    headingCount: number;
};
/**
 * Detect language using word-frequency profiles of common function words.
 * Returns the ISO 639-1 language code of the best match, or null if confidence is too low.
 */
export declare function detectLanguage(text: string): string | null;
export declare function analyzeContentQuality(text: string, url?: string, pageData?: PageData, customStopWords?: string[]): ContentQualityResult;
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