import type { ComparisonResult, Hl7Version } from "./types";
/**
 * Compares two versions and returns their relationship.
 *
 * @param a - First version (string or parsed object)
 * @param b - Second version (string or parsed object)
 * @returns -1 if a < b, 0 if a = b, 1 if a > b
 * @throws {VersionParseError} If either input is an invalid version string
 *
 * @example
 * ```typescript
 * compare("2.5.1", "2.5.0");  // => 1
 * compare("2.3", "2.5");      // => -1
 * compare("2.5.1", "2.5.1");  // => 0
 *
 * // Works with parsed versions too
 * const v1 = parse("2.5.1");
 * const v2 = parse("2.5.0");
 * compare(v1, v2);  // => 1
 * ```
 */
export declare function compare(a: string | Hl7Version, b: string | Hl7Version): ComparisonResult;
/**
 * Checks if two versions are equal.
 *
 * @param a - First version (string or parsed object)
 * @param b - Second version (string or parsed object)
 * @returns true if versions are equal, false otherwise
 * @throws {VersionParseError} If either input is an invalid version string
 *
 * @example
 * ```typescript
 * eq("2.5.1", "2.5.1");  // => true
 * eq("2.5", "2.5.0");    // => true (normalized)
 * eq("2.5.1", "2.5.0");  // => false
 * ```
 */
export declare function eq(a: string | Hl7Version, b: string | Hl7Version): boolean;
/**
 * Checks if first version is less than second version.
 *
 * @param a - First version (string or parsed object)
 * @param b - Second version (string or parsed object)
 * @returns true if a < b, false otherwise
 * @throws {VersionParseError} If either input is an invalid version string
 *
 * @example
 * ```typescript
 * lt("2.3.0", "2.5.1");  // => true
 * lt("2.5.1", "2.5.1");  // => false
 * lt("2.5.1", "2.3.0");  // => false
 * ```
 */
export declare function lt(a: string | Hl7Version, b: string | Hl7Version): boolean;
/**
 * Checks if first version is less than or equal to second version.
 *
 * @param a - First version (string or parsed object)
 * @param b - Second version (string or parsed object)
 * @returns true if a <= b, false otherwise
 * @throws {VersionParseError} If either input is an invalid version string
 *
 * @example
 * ```typescript
 * lte("2.3.0", "2.5.1");  // => true
 * lte("2.5.1", "2.5.1");  // => true
 * lte("2.5.1", "2.3.0");  // => false
 * ```
 */
export declare function lte(a: string | Hl7Version, b: string | Hl7Version): boolean;
/**
 * Checks if first version is greater than second version.
 *
 * @param a - First version (string or parsed object)
 * @param b - Second version (string or parsed object)
 * @returns true if a > b, false otherwise
 * @throws {VersionParseError} If either input is an invalid version string
 *
 * @example
 * ```typescript
 * gt("2.5.1", "2.3.0");  // => true
 * gt("2.5.1", "2.5.1");  // => false
 * gt("2.3.0", "2.5.1");  // => false
 * ```
 */
export declare function gt(a: string | Hl7Version, b: string | Hl7Version): boolean;
/**
 * Checks if first version is greater than or equal to second version.
 *
 * @param a - First version (string or parsed object)
 * @param b - Second version (string or parsed object)
 * @returns true if a >= b, false otherwise
 * @throws {VersionParseError} If either input is an invalid version string
 *
 * @example
 * ```typescript
 * gte("2.5.1", "2.3.0");  // => true
 * gte("2.5.1", "2.5.1");  // => true
 * gte("2.3.0", "2.5.1");  // => false
 * ```
 */
export declare function gte(a: string | Hl7Version, b: string | Hl7Version): boolean;
/**
 * Determines the highest-level component that differs between two versions.
 *
 * @param v1 - First version (string or parsed object)
 * @param v2 - Second version (string or parsed object)
 * @returns 'major', 'minor', 'patch', or null if versions are equal
 * @throws {VersionParseError} If either input is an invalid version string
 *
 * @example
 * ```typescript
 * diff("2.5.1", "3.0.0");  // => "major"
 * diff("2.5.1", "2.6.0");  // => "minor"
 * diff("2.5.1", "2.5.2");  // => "patch"
 * diff("2.5.1", "2.5.1");  // => null (equal)
 *
 * // Works with partial versions
 * diff("2", "2.0.0");      // => null (normalized to same)
 * diff("2.5", "2.6");      // => "minor"
 * ```
 */
export declare function diff(v1: string | Hl7Version, v2: string | Hl7Version): "major" | "minor" | "patch" | null;
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