Get files from directory using RecursiveDirectoryIterator

getComponents.php

<?php

$dirs = get_directories('components');
Timber::$dirname = array_merge(add_components_dir($dirs), ['views', 'svgs']);

function get_directories($componentsDir)
{
    $dir = get_template_directory() . '/' . $componentsDir;
    $dirIterator = new RecursiveDirectoryIterator($dir, RecursiveDirectoryIterator::SKIP_DOTS);

    return array_reduce(iterator_to_array($dirIterator, true), function ($dirs, $dir) use ($componentsDir) {
        $dirs[] = $dir->getFilename();
        return $dirs;
    }, []);
}

function add_components_dir($dirs)
{
    return array_map(function ($dir) {
        return 'components/' . $dir;
    }, $dirs);
}