import type { ExistsResult, ExistsOptions } from './npm.js';
interface PurlObject {
    name: string;
    namespace?: string | undefined;
    qualifiers?: Record<string, string> | undefined;
    subpath?: string | undefined;
    type?: string | undefined;
    version?: string | undefined;
}
/**
 * Check if a Ruby gem exists in rubygems.org.
 *
 * Queries rubygems.org at https://rubygems.org/api/v1/versions to verify gem
 * existence and optionally validate a specific version. Returns the latest
 * version from the versions array.
 *
 * **Caching:** Responses can be cached using a TTL cache to reduce registry
 * requests. Pass `{ cache }` option with a cache instance from `createTtlCache()`.
 *
 * @param name - Gem name (e.g., 'rails', 'rake')
 * @param version - Optional version to validate (e.g., '7.0.0')
 * @param options - Optional configuration including cache
 * @returns Promise resolving to existence result with latest version
 *
 * @example
 * ```typescript
 * // Check if gem exists
 * const result = await gemExists('rails')
 * // -> { exists: true, latestVersion: '7.1.3' }
 *
 * // Validate specific version
 * const result = await gemExists('rake', '13.0.0')
 * // -> { exists: true, latestVersion: '13.1.0' }
 *
 * // With caching
 * import { createTtlCache } from '@socketsecurity/lib/cache-with-ttl'
 * const cache = createTtlCache({ ttl: 5 * 60 * 1000, prefix: 'gem' })
 * const result = await gemExists('rails', undefined, { cache })
 *
 * // Non-existent gem
 * const result = await gemExists('this-gem-does-not-exist')
 * // -> { exists: false, error: 'Gem not found' }
 * ```
 */
export declare function gemExists(name: string, version?: string, options?: ExistsOptions): Promise<ExistsResult>;
/**
 * Validate RubyGem package URL.
 * Gem packages must not have a namespace. Name must not contain injection characters.
 */
export declare function validate(purl: PurlObject, throws: boolean): boolean;
export {};