import type { UnitCategory, UnitDef, UnitInput, UnitResult } from './types.js';
/**
 * Get all available unit categories
 *
 * @returns Array of category names
 */
export declare function getUnitCategories(): UnitCategory[];
/**
 * Get unit definitions for a specific category
 *
 * @param category - Unit category
 * @returns Array of unit definitions
 */
export declare function getUnitsForCategory(category: UnitCategory): UnitDef[];
/**
 * Calculate unit conversion
 *
 * Converts a value from one unit to another within the same category,
 * and provides conversions to all units in that category.
 *
 * @param input - Unit conversion input
 * @returns Conversion result with target value and all conversions
 * @throws RangeError if the category is unknown, or if fromUnit or toUnit
 *   is not a supported unit in the category
 */
export declare function calculateUnit(input: UnitInput): UnitResult;
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