import { LocalPackageSource } from "./LocalPackageSource";
import { PackageInfo } from "./PackageInfo";
/**
 * Reads package metadata and loads package information from a local directory
 * where OpenT2T packages have been npm-installed.
 */
export declare class InstalledPackageSource extends LocalPackageSource {
    /**
     * Path to the directory where packages are cached. In order to enable requiring
     * modules in these packages without using relative paths, the path should be a
     * node_modules directory that is included in the search path.
     */
    readonly cacheDirectory: string;
    /**
     * Creates a new InstalledPackageSource with a specified cache directory.
     *
     * @param {string} cacheDirectory  Path to the directory where packages are
     *     npm-installed.
     */
    constructor(cacheDirectory: string);
    /**
     * Gets information about all OpenT2T packages currently available from the source.
     * CAUTION: This is a potentially slow operation.
     *
     * @returns {Promise<PackageInfo[]>} An array of package information
     * objects, or an empty array if the cache is empty
     */
    getAllPackageInfoAsync(): Promise<PackageInfo[]>;
    /**
     * 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>;
    /**
     * Copies a package to a target directory.
     *
     * @param {string} name  Name of the package
     * @param {string} targetDirectory  Directory where the package is to be copied
     */
    copyPackageAsync(name: string, targetDirectory: string): Promise<void>;
}