import { PackageInfo } from "./PackageInfo";
import { PackageSource } from "./PackageSource";
/**
 * Acquires OpenT2T packages from an NPM registry.
 */
export declare class NpmPackageSource extends PackageSource {
    readonly registryUri: string;
    constructor(registryUri?: string);
    /**
     * Gets information about an OpenT2T package from the source
     * (potentially without downloading the whole package).
     *
     * @param {string} name  Name of the package
     * @returns {(Promise<PackageInfo | null)} Information about the requested
     * package, or null if the requested package is not found at the source
     */
    getPackageInfoAsync(name: string): Promise<PackageInfo | null>;
    /**
     * Downloads or copies a package to a target (cache) directory.
     *
     * @param {string} name  Name of the package
     * @param {string} targetDirectory  Directory where the package is to be extracted
     */
    copyPackageAsync(name: string, targetDirectory: string): Promise<void>;
}