local filesDir = _files:getFilesDir()
local file = _files:buildFile(function(fileBuilder)
    fileBuilder:setPath(filesDir, "tmp/aaa.txt")
end)
file:writeText("hello world", "UTF-8")
local dest = _files:buildFile(function(fileBuilder)
    fileBuilder:setPath(filesDir, "tmp/bbb.txt")
end)
_console:log(file:renameTo(dest))
_console:log(file:exists())
_console:log(dest:exists())
file:delete()
dest:delete()