import type { GearInput, GearResult } from './types.js';
/**
 * Calculate gear geometry based on module system.
 *
 * Module: m = d / z (pitch diameter / number of teeth)
 * Center distance: a = (z1 + z2) x m / 2
 * Addendum: ha = m
 * Dedendum: hf = 1.25 x m
 * Circular pitch: p = pi x m
 * Base circle diameter: db = d x cos(pressure angle)
 *
 * @reference ISO 21771 — Gears — Cylindrical involute gears and gear pairs — Concepts and geometry
 */
export declare function gear(input: GearInput): GearResult;
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