<?php
$filesDir = $files->getFilesDir();
$file = $files->buildFile(function ($fileBuilder) use ($filesDir) {
    $fileBuilder->setPath($filesDir, "tmp/aaa.txt");
});
$file->writeText("hello world", "UTF-8");
$file->forEachLine("UTF-8", function ($it) use ($console) {
    $console->log($it);
});
$file->delete();