export declare type LengthUnit = "mm" | "cm" | "dm" | "m" | "in" | "ft";
export declare type LengthValue = {
    length: number;
    unit: LengthUnit;
};
export declare const isEqualLength: (l: LengthValue, r: LengthValue) => boolean;
/**
 * Converts string to LengthUnit.
 * @throws an error if the supplied string isn't a known length unit
 */
export declare function toLengthUnit(unit: string): LengthUnit;
/**
 * As we accept inch as an alias for in we can't make this a typeguard
 */
export declare function isLengthUnit(unit: string): boolean;
export declare function convertLength(l: number, from: LengthUnit, to: LengthUnit): number;
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