import { DiscoveredPromptFile, PromptSource } from '../../types/prompt-source';
/**
 * Discovers .prompt files from npm packages by fetching tarballs from the registry.
 *
 * Supports:
 * - Package specifiers: "package-name" or "package-name@version"
 * - Direct tarball URLs: "https://registry.npmjs.org/pkg/-/pkg-1.0.0.tgz"
 * - Custom registry URLs for enterprise registries
 */
export declare class NpmRegistryPromptSource implements PromptSource {
    private packageName?;
    private version?;
    private tarballUrl?;
    private registryUrl;
    constructor(specifier: string, options?: {
        registryUrl?: string;
    });
    /**
     * Create an NpmRegistryPromptSource from a direct tarball URL.
     */
    static fromUrl(url: string): NpmRegistryPromptSource;
    getPrompts(): Promise<DiscoveredPromptFile[]>;
    /**
     * Parse a package specifier into name and optional version.
     */
    private parseSpecifier;
    /**
     * Resolve the tarball URL by fetching package metadata from the registry.
     */
    private resolveTarballUrl;
    /**
     * Download a tarball from the given URL.
     */
    private downloadTarball;
}
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