import type { SpringInput, SpringResult } from './types.js';
/**
 * Calculate helical compression/extension spring properties.
 *
 * Spring rate: k = Gd^4 / (8D^3 x n)
 * Spring index: C = D/d
 * Wahl stress correction factor: Ks = (4C - 1)/(4C - 4) + 0.615/C
 * Shear stress: tau = 8PD / (pi x d^3) x Ks
 */
export declare function spring(input: SpringInput): SpringResult;
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