import type { FallClearanceInput, FallClearanceResult } from './types.js';
/**
 * Calculate fall clearance requirements for personal fall protection systems.
 * Implements ANSI Z359.1 and Z359.4 guidelines.
 *
 * Total Fall Distance = Lanyard Length + Deceleration Distance + Harness Stretch + Worker Height
 * Free Space Required = Total Fall Distance + Safety Factor + Rescue Clearance - Anchor Height
 * Clearance Above Obstacle = Anchor Height - (Total Fall Distance + Safety Factor) - Obstacle Height
 *
 * ANSI Z359 Components:
 * - Lanyard/SRL length: typically 1.8m (6ft)
 * - Deceleration distance: max 1.07m (3.5ft) per OSHA
 * - Harness stretch: ~0.3m (1ft)
 * - D-ring to feet: ~1.5m (5ft)
 * - Rescue clearance: 0.9m (3ft) minimum per ANSI Z359.4
 *
 * @param input - Fall clearance parameters
 * @returns Fall clearance results including adequacy assessment and warnings
 * @reference OSHA 29 CFR 1926.502(d)(16)(iv) — personal fall arrest systems must limit
 *   deceleration distance to 3.5 ft (1.07 m)
 * @throws {RangeError} workerHeight ≤ 0, or any distance (lanyardLength,
 *   decelerationDistance, harnessStretch, safetyFactor, rescueClearance,
 *   obstacleHeight) is negative.
 * @remarks anchorHeight ≤ 0 is NOT rejected: it is a valid (dangerous) geometry
 *   that the function reports as isAdequate=false with a warning.
 */
export declare function fallClearance(input: FallClearanceInput): FallClearanceResult;
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