/**
 * Physical length measurements for drawings, page margins, and related
 * internal authoring paths (API-RULES R4.1–R4.3).
 *
 * **Not part of the package root API.** Import only from this module inside
 * the library (or tests that exercise it). Callers must not rely on
 * `Cm` / `Emu` / `Inches` / `Mm` / `Pt` / `Px` / `isLength` / `Length` as
 * public exports from `@syncfusion/ej2-xlsx`.
 *
 * Internal base unit is EMU (English Metric Unit).
 * 1 inch = 914400 EMU, 1 pt = 12700 EMU — both exact.
 *
 * Citations:
 * - docs/api/API-RULES.md R4.1–R4.3
 * - ECMA-376 drawing EMU; SpreadsheetML page margins in inches
 *
 * @private
 */
declare const lengthBrand: unique symbol;
/**
 * A physical length used for drawing sizes and page margins, created with
 * unit helpers such as `Inches` or `Pt`.
 */
export declare type Length = number & {
    readonly [lengthBrand]: void;
};
/** EMU per inch (exact). */
export declare const EMU_PER_INCH = 914400;
/** EMU per centimeter (exact). */
export declare const EMU_PER_CM = 360000;
/** EMU per millimeter (exact). */
export declare const EMU_PER_MM = 36000;
/** EMU per point (exact; 72 pt = 1 in). */
export declare const EMU_PER_PT = 12700;
/** EMU per CSS pixel at 96 DPI (914400 / 96). */
export declare const EMU_PER_PX_96DPI = 9525;
/** @private
 * Length from inches.
 */
export declare function Inches(value: number): Length;
/** @private
 * Length from centimeters.
 */
export declare function Cm(value: number): Length;
/** @private
 * Length from millimeters.
 */
export declare function Mm(value: number): Length;
/** @private
 * Length from typographic points (1/72 inch).
 */
export declare function Pt(value: number): Length;
/** @private
 * Length from CSS pixels assuming **96 DPI** (API-RULES R4.1).
 */
export declare function Px(value: number): Length;
/** @private
 * Escape-hatch constructor from raw EMU (API-RULES R4.1).
 */
export declare function Emu(value: number): Length;
/** @private
 * True when `value` is a finite non-negative number (Length is a branded number).
 */
export declare function isLength(value: unknown): value is Length;
/** Raw EMU for a {@link Length}. @private */
export declare function lengthToEmu(length: Length): number;
/**
 * Convert length to inches (SpreadsheetML page-margin unit).
 * Half-away-from-zero rounding is applied by callers when serializing.
 * @private
 */
export declare function lengthToInches(length: Length): number;
/**
 * Build a Length from an inches double (load path).
 * @private
 */
export declare function inchesToLength(inches: number): Length;
/**
 * Format an inches double for OOXML attributes (trim trailing zeros).
 * @private
 */
export declare function formatInchesAttr(inches: number): string;
export {};