/**
 * Enumeration of linear units used in AutoCAD drawings.
 *
 * This enum defines the various units that can be used to represent
 * linear measurements in AutoCAD drawings, including metric, imperial,
 * and survey units.
 */
export declare enum AcDbUnitsValue {
    /** Undefined or unitless */
    Undefined = 0,
    /** Inches */
    Inches = 1,
    /** Feet */
    Feet = 2,
    /** Miles */
    Miles = 3,
    /** Millimeters */
    Millimeters = 4,
    /** Centimeters */
    Centimeters = 5,
    /** Meters */
    Meters = 6,
    /** Kilometers */
    Kilometers = 7,
    /** Microinches */
    Microinches = 8,
    /** Mils (thousandths of an inch) */
    Mils = 9,
    /** Yards */
    Yards = 10,
    /** Angstroms */
    Angstroms = 11,
    /** Nanometers */
    Nanometers = 12,
    /** Microns (micrometers) */
    Microns = 13,
    /** Decimeters */
    Decimeters = 14,
    /** Dekameters */
    Dekameters = 15,
    /** Hectometers */
    Hectometers = 16,
    /** Gigameters */
    Gigameters = 17,
    /** Astronomical units */
    Astronomical = 18,
    /** Light years */
    LightYears = 19,
    /** Parsecs */
    Parsecs = 20,
    /**
     * US Survey Feet - a historical survey unit that's about 2 parts per million larger than
     * the International Feet unit. This difference is significant only at scales used for mapping in
     * the U.S. The US Survey Feet setting is supported only for inserting or attaching drawings
     * starting with AutoCAD 2017-based products. Drawings opened in prior versions will treat the US
     * Survey Feet setting as Unitless.
     */
    USSurveyFeet = 21,
    /** US Survey Inches */
    USSurveyInch = 22,
    /** US Survey Yards */
    USSurveyYard = 23,
    /** US Survey Miles */
    USSurveyMile = 24,
    /** Maximum value for units */
    Max = 24
}
/**
 * Checks if the specified units value represents metric units.
 *
 * This function returns true if the units are part of the metric system,
 * including millimeters, centimeters, meters, kilometers, and their
 * decimal multiples and submultiples.
 *
 * @param units - The units value to check
 * @returns True if the units are metric, false otherwise
 *
 * @example
 * ```typescript
 * const isMetric = isMetricUnits(AcDbUnitsValue.Millimeters); // true
 * const isMetric2 = isMetricUnits(AcDbUnitsValue.Inches); // false
 * ```
 */
export declare function isMetricUnits(units: AcDbUnitsValue): units is AcDbUnitsValue.Millimeters | AcDbUnitsValue.Centimeters | AcDbUnitsValue.Meters | AcDbUnitsValue.Kilometers | AcDbUnitsValue.Nanometers | AcDbUnitsValue.Microns | AcDbUnitsValue.Decimeters | AcDbUnitsValue.Dekameters | AcDbUnitsValue.Hectometers | AcDbUnitsValue.Gigameters;
/**
 * Checks if the specified units value represents imperial units.
 *
 * This function returns true if the units are part of the imperial system,
 * including inches, feet, miles, yards, and US survey units.
 *
 * @param units - The units value to check
 * @returns True if the units are imperial, false otherwise
 *
 * @example
 * ```typescript
 * const isImperial = isImperialUnits(AcDbUnitsValue.Inches); // true
 * const isImperial2 = isImperialUnits(AcDbUnitsValue.Millimeters); // false
 * ```
 */
export declare function isImperialUnits(units: AcDbUnitsValue): units is AcDbUnitsValue.Inches | AcDbUnitsValue.Feet | AcDbUnitsValue.Miles | AcDbUnitsValue.Microinches | AcDbUnitsValue.Mils | AcDbUnitsValue.Yards | AcDbUnitsValue.USSurveyFeet;
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