export declare function addExtensionDarwin(extension_csv: string, version: string): Promise<string>;
export declare function addExtensionWindows(extension_csv: string, version: string): Promise<string>;
export declare function addExtensionLinux(extension_csv: string, version: string): Promise<string>;
export declare function addExtension(extension_csv: string, version: string, os: string, no_step?: boolean): Promise<string>;