type DispersionSymbol = typeof dispersionSymbols[number];
/**
 * Type predicate.
 * @param candidate The candidate to test.
 */
declare function isDispersionSymbol(candidate: any): candidate is DispersionSymbol;
/**
* All the Dispersion symbols.
*/
declare const dispersionSymbols: readonly ["ppm", "ppb", "ppt"];

/**
 * The object representation of a measurement.
 *
 * @template Unit The type of the unit of measurement.
 * @template Value The type of the value of the measurement.
 */
type Measurement$1<Unit extends string, Value extends number = number> = Number & {
    readonly value: Value;
    readonly unit: Unit;
};

/**
 * Represents a dimension measurement.
 * @template Units - The units of the dimension.
 */
type Measurement<Units extends string, Unit extends Units = Units, Value extends number = number> = Measurement$1<Unit, Value> & Alternatives<Units>;

/**
 * Represents a collection of alternative measurements for different units.
 *
 * @template Units - The string literal type representing the available units.
 */
type Alternatives<Units extends string> = {
    readonly [unit in Units]: Measurement<Units, unit, number>;
};

/**
 * A dimension is a map of units to creation functions.
 * Each function takes a number value and returns a
 * dimension measurement.
 * @template Units - The units of the dimension.
 */
type Dimension<Units extends string> = {
    readonly [unit in Units]: (value: number) => Measurement<Units>;
};

type Dispersion = Measurement<DispersionSymbol>;
declare const dispersion: Dimension<"ppm" | "ppb" | "ppt">;
declare const partsPerMillion: (value: number) => Measurement<"ppm" | "ppb" | "ppt">;
declare const partsPerBillion: (value: number) => Measurement<"ppm" | "ppb" | "ppt">;
declare const partsPerTrillion: (value: number) => Measurement<"ppm" | "ppb" | "ppt">;

export { dispersion, dispersionSymbols, isDispersionSymbol, partsPerBillion, partsPerMillion, partsPerTrillion };
export type { Dispersion, DispersionSymbol };