import type { Spec, Estimation, Difficulty, SpecScope } from '../types/index.js';
/**
 * Round a number to a given number of decimal places.
 */
export declare function roundTo(value: number, decimals: number): number;
/**
 * Determine confidence level based on difficulty, scope, and historical data.
 */
export declare function determineConfidence(difficulty: Difficulty, scope: SpecScope, historyCount: number): 'low' | 'medium' | 'high';
/**
 * Build human-readable reasoning text for an estimation result.
 */
export declare function buildReasoning(spec: Spec, estimation: Estimation, confidence: 'low' | 'medium' | 'high', historyCount: number): string;
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