import type { RoofInput, RoofResult } from './types.js';
/**
 * Calculate roof slope, rafter length, and roof area
 *
 * Formulas:
 * - Slope (degrees) = atan(rise / run) × (180 / π)
 * - Slope (percent) = (rise / run) × 100
 * - Rafter length = sqrt(rise² + run²)
 * - Slope factor = sqrt(1 + (rise/run)²)
 * - Roof area = footprint area × slope factor
 *
 * @param input - Roof input parameters
 * @returns Roof calculation results
 */
export declare function roof(input: RoofInput): RoofResult;
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