import type { DegreeDayInput, DegreeDayResult } from './types.js';
/**
 * Degree Day (HDD/CDD) Calculator — ISO 50001 EnB
 *
 * @formula
 *   - HDD = Σ max(0, T_base_heating − T_daily)
 *   - CDD = Σ max(0, T_daily − T_base_cooling)
 *
 * @reference ASHRAE Fundamentals Handbook — Degree Day Method
 * @reference ISO 50001:2018 — Energy management systems
 * @throws RangeError if dailyTemps is empty
 */
export declare function degreeDay(input: DegreeDayInput): DegreeDayResult;
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