filesDir = _files.getFilesDir()


def fn1(fileBuilder):
    fileBuilder.setPath(filesDir, "tmp/aaa.txt")


file = _files.buildFile(fn1)
file.writeText("hello world", "UTF-8")


def fn2(fileBuilder):
    fileBuilder.setPath(filesDir, "tmp/bbb.txt")


dest = _files.buildFile(fn2)
_console.log(file.renameTo(dest))
_console.log(file.exists())
_console.log(dest.exists())
file.delete()
dest.delete()