• Asynchronously append data to a file, creating the file if it does not yet exist. data can be a string or a Buffer.

    If options is a string, then it specifies the encoding.

    The mode option only affects the newly created file. See fs.open() for more details.

    The path may be specified as a FileHandle that has been opened for appending (using fsPromises.open()).

    Since

    v10.0.0

    Returns

    Fulfills with undefined upon success.

    Parameters

    Returns Promise<void>