import type { $Record } from '../object/types';
import type { Numeric } from '../types/index';
import { $BaseConverter } from './base';
import type { $LengthUnit, FormatToOptions } from './types';
/**
 * @class LengthConverter
 * @description Handles conversions with smart `.to()`, `.toAll()`, and `.formatTo()`.
 */
export declare class $Length extends $BaseConverter<$LengthUnit> {
    #private;
    /**
     * Convert length/distance value to other length/distance units
     * @param value Number or numeric string value to convert.
     * @param unit Base length/distance unit for the provided value.
     */
    constructor(value: Numeric, unit: $LengthUnit);
    /**
     * @instance Converts to target length/distance unit.
     * @param target Target length/distance unit.
     */
    to(target: $LengthUnit): number;
    /**
     * @instance Converts to all data units.
     * @returns Object with all unit conversions.
     */
    toAll(): $Record<$LengthUnit, number>;
    /**
     * @instance Formats the converted value and unit.
     * @param target Target unit to format to.
     * @param options Formatting options.
     * @returns Formatted string like "5km", "5.12 miles", or "5e+3 meter".
     */
    formatTo(target: $LengthUnit, options?: FormatToOptions): string;
}