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 NuGet package exists in NuGet.org.
 *
 * Queries the NuGet V3 API to verify package existence and retrieve
 * the latest version.
 *
 * @param name - Package name (e.g., 'Newtonsoft.Json')
 * @param version - Optional version to validate (e.g., '13.0.3')
 * @param options - Optional configuration including cache
 * @returns Promise resolving to existence result with latest version
 *
 * @example
 * ```typescript
 * // Check if package exists
 * const result = await nugetExists('Newtonsoft.Json')
 * // -> { exists: true, latestVersion: '13.0.3' }
 *
 * // Validate specific version
 * const result = await nugetExists('Newtonsoft.Json', '13.0.3')
 * // -> { exists: true, latestVersion: '13.0.3' }
 *
 * // Non-existent package
 * const result = await nugetExists('fake-package-xyz')
 * // -> { exists: false, error: 'Package not found' }
 * ```
 */
export declare function nugetExists(name: string, version?: string, options?: ExistsOptions): Promise<ExistsResult>;
/**
 * Validate NuGet package URL.
 * NuGet packages must not have a namespace. Name must not contain injection characters.
 */
export declare function validate(purl: PurlObject, throws: boolean): boolean;
export {};