import { Angle, Distance, Mass, Pressure, Speed, Temperature, Volume } from "convert-units";
/**
 * Distance unit type that extends convert-units Distance with nautical miles ('nmi'),
 * which is not natively supported by convert-units v2.
 */
export type AviationDistance = Distance | 'nmi';
/**
 * Defines unit preferences for various measurements used in flight planning.
 *
 * @interface UnitOptions
 * @property {Speed} [speed='knot'] - Unit for speed measurements (knots, kilometers per hour, miles per hour, or meters per second).
 * @property {AviationDistance} [distance='nmi'] - Unit for distance measurements (nautical miles, kilometers, or miles).
 * @property {Distance} [runway='m'] - Unit for runway length measurements (meters or feet).
 * @property {Distance} [altitude='ft'] - Unit for altitude measurements (feet or meters).
 * @property {Distance} [elevation='ft'] - Unit for elevation measurements (feet or meters).
 * @property {Temperature} [temperature='C'] - Unit for temperature measurements (Celsius or Fahrenheit).
 * @property {Pressure} [pressure='hPa'] - Unit for pressure measurements (hectopascals or inches of mercury).
 * @property {Mass} [mass='kg'] - Unit for weight measurements (kilograms or pounds).
 * @property {Volume} [volume='l'] - Unit for volume measurements (liters or gallons).
 * @property {Angle} [angle='deg'] - Unit for angular measurements (degrees or radians).
 */
export interface UnitOptions {
    speed?: Speed;
    distance?: AviationDistance;
    runway?: Distance;
    altitude?: Distance;
    elevation?: Distance;
    temperature?: Temperature;
    pressure?: Pressure;
    mass?: Mass;
    volume?: Volume;
    angle?: Angle;
}
/**
 * Converts speed from default units to the specified units.
 *
 * @param {number} speed - The speed value to convert.
 * @param {UnitOptions} units - The target unit options.
 * @returns {number} The converted speed.
 */
export declare const convertSpeed: (speed: number, units: UnitOptions) => number;
/**
 * Converts elevation from default units to the specified units.
 *
 * @param {number} elevation - The elevation value to convert.
 * @param {UnitOptions} units - The target unit options.
 * @returns {number} The converted elevation.
 */
export declare const convertElevation: (elevation: number, units: UnitOptions) => number;
/**
 * Converts altitude from default units to the specified units.
 *
 * @param {number} altitude - The altitude value to convert.
 * @param {UnitOptions} units - The target unit options.
 * @returns {number} The converted altitude.
 */
export declare const convertAltitude: (altitude: number, units: UnitOptions) => number;
/**
 * Converts temperature from default units to the specified units.
 *
 * @param {number} temperature - The temperature value to convert.
 * @param {UnitOptions} units - The target unit options.
 * @returns {number} The converted temperature.
 */
export declare const convertTemperature: (temperature: number, units: UnitOptions) => number;
/**
 * Converts pressure from default units to the specified units.
 *
 * @param {number} pressure - The pressure value to convert.
 * @param {UnitOptions} units - The target unit options.
 * @returns {number} The converted pressure.
 */
export declare const convertPressure: (pressure: number, units: UnitOptions) => number;
/**
 * Converts distance from default units to the specified units.
 *
 * @param {number} distance - The distance value to convert.
 * @param {UnitOptions} units - The target unit options.
 * @returns {number} The converted distance.
 */
export declare const convertDistance: (distance: number, units: UnitOptions) => number;
/**
 * Converts mass from default units to the specified units.
 *
 * @param {number} mass - The mass value to convert.
 * @param {UnitOptions} units - The target unit options.
 * @returns {number} The converted mass.
 */
export declare const convertMass: (mass: number, units: UnitOptions) => number;
/**
 * Converts volume from default units to the specified units.
 *
 * @param {number} volume - The volume value to convert.
 * @param {UnitOptions} units - The target unit options.
 * @returns {number} The converted volume.
 */
export declare const convertVolume: (volume: number, units: UnitOptions) => number;