import * as readPkgUp from 'read-pkg-up';
declare const _singleton: unique symbol;
/**
 * Contains information relating to this npm package, including its installation location.
 */
export declare class PackageInfo {
    readonly directoryPath: string;
    readonly filePath: string;
    readonly json: readPkgUp.NormalizedPackageJson;
    private static [_singleton];
    /**
     * Creates an instance of {@link PackageInfo}.
     *
     * @param directoryPath - The path of the package's installation directory.
     * @param filePath - The path of the package's `package.json` file.
     * @param json - The JSON contents of the package's `package.json` file.
     */
    private constructor();
    /**
     * Returns a singleton instance of {@link PackageInfo}.
     *
     * @return A singleton {@link PackageInfo}.
     */
    static getSingleton(): Promise<PackageInfo>;
}
export {};