import type { RoughnessInput, RoughnessResult } from './types.js';
/**
 * Convert surface roughness between Ra, Rz, and N class.
 *
 * Conversion is a lookup against the ISO 1302 grade table (N1-N12, Ra 0.025-50 µm,
 * Rz 0.1-200 µm) with nearest-grade snapping. Inputs outside the table — realistic ones exist
 * on both ends (lapped/superfinished Ra ≈ 0.006 µm, rough sand casting Ra ≈ 100 µm) — are
 * snapped to the boundary grade and disclosed via `outOfTableRange: true`, because the
 * returned grade is then NOT equivalent to the input (up to 4× off at the edges).
 *
 * @reference ISO 1302 — surface texture indication, N-grade table
 * @throws RangeError if value is not positive
 */
export declare function roughness(input: RoughnessInput): RoughnessResult;
//# sourceMappingURL=roughness.d.ts.map