import type { ExistsResult, ExistsOptions } from './npm.js';
/**
 * Check if a Haskell package exists on Hackage.
 *
 * Queries Hackage API to verify package existence and retrieve
 * the latest version.
 *
 * @param name - Package name (e.g., 'aeson')
 * @param version - Optional version to validate (e.g., '2.2.0.0')
 * @param options - Optional configuration including cache
 * @returns Promise resolving to existence result with latest version
 *
 * @example
 * ```typescript
 * // Check if package exists
 * const result = await hackageExists('aeson')
 * // -> { exists: true, latestVersion: '2.2.0.0' }
 *
 * // Validate specific version
 * const result = await hackageExists('aeson', '2.2.0.0')
 * // -> { exists: true, latestVersion: '2.2.0.0' }
 *
 * // Non-existent package
 * const result = await hackageExists('fake-package')
 * // -> { exists: false, error: 'Package not found' }
 * ```
 */
export declare function hackageExists(name: string, version?: string, options?: ExistsOptions): Promise<ExistsResult>;