import type { ConfinedSpaceInput, ConfinedSpaceResult } from './types.js';
/**
 * Confined Space Atmospheric Assessment — OSHA 29 CFR 1910.146
 *
 * @formula Direct threshold comparison:
 *   - O₂: 19.5–23.5% safe, <19.5% deficient, >23.5% enriched
 *   - LEL: <10% safe, 10-25% caution, >25% danger
 *   - H₂S: <10 ppm safe, 10-20 caution, 20-100 danger, >100 IDLH
 *   - CO: <25 ppm safe, 25-50 caution, 50-1200 danger, >1200 IDLH
 *
 * @reference OSHA 29 CFR 1910.146 — Permit-required confined spaces
 * @reference NIOSH Pocket Guide to Chemical Hazards
 *
 * @throws {RangeError} oxygenPercent outside 0–100, or any gas reading
 *   (lelPercent, h2sPpm, coPpm, customGas fields) is negative.
 * @remarks A reading of 0 is a valid (and possibly catastrophic) measurement,
 *   so zero values are accepted; only physically impossible values throw.
 */
export declare function confinedSpace(input: ConfinedSpaceInput): ConfinedSpaceResult;
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