import type { RebaInput, RebaResult } from './types.js';
/**
 * REBA (Rapid Entire Body Assessment) — Ergonomic Risk
 *
 * @reference Hignett, S. & McAtamney, L. (2000). REBA, Applied Ergonomics 31(2), 201-205.
 *   Tables A/B/C and step adjustments follow the published REBA Employee Assessment
 *   Worksheet (Hedge) derived from that paper.
 * @reference 중대재해처벌법 시행령 — 인체공학적 유해요인 평가
 *
 * @throws {RangeError} load is negative.
 * @remarks Joint angles may legitimately be negative (flexion vs. extension), so they
 *   are not range-checked; only the handled load (kg) must be non-negative.
 *   `coupling` (Step 11: good/fair/poor/unacceptable → +0..+3) defaults to 'good'.
 */
export declare function ergonomicRisk(input: RebaInput): RebaResult;
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