/**
 * npm-installer — on-demand spec installation via npm's Arborist.
 *
 * Isolated in its own module so @npmcli/arborist (heavy) is only loaded
 * when a spec isn't available locally and needs to be fetched from a registry.
 */
import type { RegistryConfig } from './spec-resolver.js';
export declare function installPackage(packageSpec: string, installDir: string, cacheDir: string, registries?: Record<string, RegistryConfig>): Promise<void>;
//# sourceMappingURL=npm-installer.d.ts.map