import type { LelInput, LelResult } from './types.js';
/**
 * LEL (Lower Explosive Limit) for Mixed Gases — Le Chatelier's Rule
 *
 * @formula
 *   - LEL_mix = 1 / Σ(yi / LELi)
 *   - yi = concentration_i / total_concentration (mole fraction)
 *   - %LEL = totalConcentration / LEL_mix × 100
 *
 * @reference Le Chatelier, H. (1891). Estimation of Firedamp by Flammability Limits.
 * @reference NFPA 69 — Standard on Explosion Prevention Systems
 *
 * @throws {RangeError} a gas component has a negative concentration or a non-positive LEL.
 * @remarks Status thresholds follow the industry %LEL convention (matching
 *   {@link confinedSpace}): safe < 10%, caution 10–25%, danger > 25%. An empty
 *   gas list (no flammable gas present) is a valid input that reports 'safe'.
 */
export declare function lel(input: LelInput): LelResult;
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