/** Record of Units (Categorized) */
export declare const UNITS: Readonly<{
    readonly time: readonly ["nanosecond", "microsecond", "millisecond", "second", "minute", "hour", "day", "week", "month", "year", "decade", "century", "millennium"];
    readonly length: readonly ["millimeter", "centimeter", "meter", "kilometer", "millimetre", "centimetre", "metre", "kilometre", "inch", "foot", "yard", "mile", "nautical-mile", "light-year"];
    readonly data: readonly ["bit", "byte", "kilobit", "kilobyte", "megabit", "megabyte", "gigabit", "gigabyte", "terabit", "terabyte", "petabit", "petabyte"];
    readonly temp: readonly ["celsius", "fahrenheit", "kelvin"];
    readonly area: readonly ["square-millimeter", "square-centimeter", "square-meter", "square-kilometer", "square-millimetre", "square-centimetre", "square-metre", "square-kilometre", "square-inch", "square-foot", "square-yard", "square-mile", "hectare", "acre"];
    readonly volume: readonly ["cubic-millimeter", "cubic-centimeter", "cubic-meter", "cubic-kilometer", "cubic-millimetre", "cubic-centimetre", "cubic-metre", "cubic-kilometre", "cubic-inch", "cubic-foot", "cubic-yard", "liter", "litre", "milliliter", "millilitre", "gallon", "quart", "pint", "cup", "tablespoon", "teaspoon"];
    readonly mass: readonly ["microgram", "milligram", "gram", "kilogram", "tonne", "ounce", "pound", "stone", "short-ton", "long-ton"];
}>;
export declare const IRREGULAR_PLURALS: Readonly<Record<string, string>>;
export declare const INVARIANT_UNITS: Readonly<Set<string>>;
export declare const Y_TO_IES: Readonly<Set<string>>;