/**
 * Reads the root directory under which npm installs global packages.
 *
 * Note: `$` is used to indicate that this function is not a pure function - it runs npm
 *
 * @returns The global npm prefix or `null` when npm could not be asked for it
 * @private internal utility of `promptbookCli`
 */
export declare function $resolveNpmGlobalPrefixPath(): Promise<string | null>;