/**
 * Valid VERS comparator operators.
 */
type VersComparator = '=' | '!=' | '<' | '<=' | '>' | '>=';
/**
 * Special wildcard comparator matching all versions.
 */
type VersWildcard = '*';
/**
 * A single version constraint within a VERS range.
 */
type VersConstraint = {
    comparator: VersComparator | VersWildcard;
    version: string;
};
/**
 * VERS (VErsion Range Specifier) parser and evaluator.
 *
 * **Early adoption:** The VERS spec is pre-standard draft. This implementation
 * supports semver-based schemes (npm, cargo, golang, gem, etc.). Additional
 * version schemes may be added as the spec matures.
 *
 * @example
 * ```typescript
 * const range = Vers.parse('vers:npm/>=1.0.0|<2.0.0')
 * range.contains('1.5.0')  // true
 * range.contains('2.0.0')  // false
 * range.toString()          // 'vers:npm/>=1.0.0|<2.0.0'
 *
 * // Wildcard matches all versions
 * Vers.parse('vers:semver/*').contains('999.0.0')  // true
 * ```
 */
declare class Vers {
    readonly scheme: string;
    readonly constraints: readonly VersConstraint[];
    private constructor();
    /**
     * Parse a VERS string.
     *
     * @param versStr - VERS string (e.g., 'vers:npm/>=1.0.0|<2.0.0')
     * @returns Vers instance
     * @throws {PurlError} If the string is not a valid VERS
     */
    static parse(versStr: string): Vers;
    /**
     * Parse a VERS string.
     *
     * @param versStr - VERS string (e.g., 'vers:npm/>=1.0.0|<2.0.0')
     * @returns Vers instance
     * @throws {PurlError} If the string is not a valid VERS
     */
    static fromString(versStr: string): Vers;
    /**
     * Check if a version is contained within this VERS range.
     *
     * Implements the VERS containment algorithm for semver-based schemes.
     *
     * @param version - Version string to check
     * @returns true if the version matches the range
     * @throws {PurlError} If the scheme is not supported
     */
    contains(version: string): boolean;
    /**
     * Serialize to canonical VERS string.
     */
    toString(): string;
}
export { Vers };
export type { VersComparator, VersConstraint, VersWildcard };