import type { FreightClassInput, FreightClassResult } from './types.js';
/**
 * Calculate NMFC Freight Class based on density
 *
 * Freight class is determined by the density of the shipment (weight per cubic foot).
 * Lower density items have higher freight classes and generally cost more to ship.
 *
 * @param input - Package weight and dimensions in imperial units
 * @returns Freight class determination results
 */
export declare function freightClass(input: FreightClassInput): FreightClassResult;
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