/**
 * Abstraction on yarn install command
 * @param packages The package we want to install
 * @returns The output of the yarn upgrade
 */
export declare function install(packages: string): Promise<string>;
/**
 * Abstraction on yarn uninstall command
 * @param packages The package we want to uninstall
 * @returns The output of the yarn remove
 */
export declare function uninstall(packages: string): Promise<string>;
/**
 * Abstraction on yarn remove command
 * @param packages The package we want to remove
 * @returns The output of the yarn uninstall
 */
export declare function remove(packages: string): Promise<string>;
/**
 * Abstraction on yarn upgrade command
 * @param packages The package we want to upgrade
 * @returns The output of the yarn upgrade
 */
export declare function upgrade(packages: string): Promise<string>;