/**
 * @file Length Scorer
 * Evaluates response length against configured constraints
 */
import type { LengthScorerConfig, ScoreResult, ScorerInput, ScorerRule } from "../../../types/index.js";
import { BaseRuleScorer } from "./baseRuleScorer.js";
/**
 * LengthScorer evaluates response length against configurable constraints
 */
export declare class LengthScorer extends BaseRuleScorer {
    private _lengthConfig;
    constructor(config?: LengthScorerConfig);
    /**
     * Get length-specific configuration
     */
    get lengthConfig(): LengthScorerConfig;
    /**
     * Get rules for this scorer
     */
    getRules(): ScorerRule[];
    /**
     * Measure text length in various units
     */
    private _measureLength;
    /**
     * Get length in the configured unit
     */
    private _getLengthInUnit;
    /**
     * Count sentences in text
     */
    private _countSentences;
    /**
     * Count paragraphs in text
     */
    private _countParagraphs;
    /**
     * Estimate token count (rough approximation)
     * GPT-style: ~4 characters per token on average
     */
    private _estimateTokens;
    /**
     * Evaluate a single length rule
     */
    evaluateRule(rule: ScorerRule, input: ScorerInput): {
        passed: boolean;
        score: number;
    };
    /**
     * Override score to add detailed length metrics
     */
    score(input: ScorerInput): Promise<ScoreResult>;
}
/**
 * Factory function for creating LengthScorer instances
 */
export declare function createLengthScorer(config?: LengthScorerConfig): Promise<LengthScorer>;
/**
 * Pre-configured length scorer presets
 */
export declare const LengthScorerPresets: {
    /** Short response (50-150 words) */
    readonly short: () => LengthScorer;
    /** Medium response (100-300 words) */
    readonly medium: () => LengthScorer;
    /** Long response (200-500 words) */
    readonly long: () => LengthScorer;
    /** Concise response (max 100 words) */
    readonly concise: () => LengthScorer;
    /** Detailed response (min 300 words) */
    readonly detailed: () => LengthScorer;
    /** Tweet-length (max 280 characters) */
    readonly tweet: () => LengthScorer;
};