/**
 * NPM Registry API Handler
 *
 * Extracts package information from npmjs.com and registry.npmjs.org.
 * Provides detailed package metadata, dependencies, and version info.
 */
import { BaseSiteHandler, type FetchFunction, type SiteHandlerOptions, type SiteHandlerResult } from './types.js';
export declare class NpmHandler extends BaseSiteHandler {
    readonly name = "NPM";
    readonly strategy: "api:npm";
    canHandle(url: string): boolean;
    extract(url: string, fetch: FetchFunction, opts: SiteHandlerOptions): Promise<SiteHandlerResult | null>;
    /**
     * Extract package name from NPM URL
     * Handles:
     * - https://www.npmjs.com/package/express
     * - https://www.npmjs.com/package/@types/node
     * - https://registry.npmjs.org/express
     * - https://registry.npmjs.org/@types%2Fnode
     */
    private getPackageName;
    /**
     * Format NPM package data into readable text/markdown
     */
    private formatPackage;
    /**
     * Extract repository URL from package.json repository field
     */
    private extractRepoUrl;
}
export declare const npmHandler: NpmHandler;
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