import type { MeasureKind } from "../conversions/types.js";
import type { BestUnitsForMeasure } from "../types/units.js";
import type { LiteralToPrimitive } from "../types/utils.js";
/**
 * Convert a given duration of milliseconds to a string that best represents it.
 *
 * If you are very concerned about performance you should use the {@link convertMany} function directly.
 *
 * @example
 * ```ts
 * ms(-3 * 60000); // '-3min'
 * ```
 *
 * @param quantity - Duration of milliseconds to convert
 *
 * @returns A duration string
 *
 * @public
 */
export declare function ms<Q extends number | bigint>(quantity: Q): `${LiteralToPrimitive<Q>}${BestUnitsForMeasure<MeasureKind.Time>}`;
/**
 * Convert a duration string to a duration in milliseconds.
 *
 * If you are very concerned about performance you should use the {@link convertMany} function directly.
 *
 * @example
 * ```ts
 * ms('1d 2h 30min'); // 95400000
 * ```
 *
 * @param value - Duration string to convert
 *
 * @returns A duration in milliseconds
 *
 * @public
 */
export declare function ms(value: string): number;