Tree.php

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<?php
namespace Magento\Cms\Block\Adminhtml\Wysiwyg\Images;

class Tree extends \Magento\Backend\Block\Template
{
    protected $_coreRegistry = null;

    protected $_cmsWysiwygImages = null;

    private $serializer;

    public function __construct(
        \Magento\Backend\Block\Template\Context $context,
        \Magento\Cms\Helper\Wysiwyg\Images $cmsWysiwygImages,
        \Magento\Framework\Registry $registry,
        array $data = [],
        \Magento\Framework\Serialize\Serializer\Json $serializer = null
    ) {
        $this->_coreRegistry = $registry;
        $this->_cmsWysiwygImages = $cmsWysiwygImages;
        $this->serializer = $serializer ?: \Magento\Framework\App\ObjectManager::getInstance()
            ->get(\Magento\Framework\Serialize\Serializer\Json::class);
        parent::__construct($context, $data);
    }

    public function getTreeJson()
    {
        $storageRoot = $this->_cmsWysiwygImages->getStorageRoot();
        $collection = $this->_coreRegistry->registry(
            'storage'
        )->getDirsCollection(
            $this->_cmsWysiwygImages->getCurrentPath()
        );
        $jsonArray = [];
        foreach ($collection as $item) {
            $data = [
                'text' => $this->_cmsWysiwygImages->getShortFilename($item->getBasename(), 20),
                'id' => $this->_cmsWysiwygImages->convertPathToId($item->getFilename()),
                'path' => substr($item->getFilename(), strlen($storageRoot)),
                'cls' => 'folder',
            ];

            $hasNestedDirectories = count(glob($item->getFilename() . '/*', GLOB_ONLYDIR)) > 0;

            // if no nested directories inside dir, add 'leaf' state so that jstree hides dropdown arrow next to dir
            if (!$hasNestedDirectories) {
                $data['state'] = 'leaf';
            }

            $jsonArray[] = $data;
        }
        return $this->serializer->serialize($jsonArray);
    }

    public function getTreeLoaderUrl()
    {
        $params = [];

        $currentTreePath = $this->getRequest()->getParam('current_tree_path');

        if (strlen($currentTreePath)) {
            $params['current_tree_path'] = $currentTreePath;
        }

        return $this->getUrl(
            'cms/*/treeJson',
            $params
        );
    }

    public function getRootNodeName()
    {
        return __('Storage Root');
    }

    public function getTreeCurrentPath()
    {
        $treePath = ['root'];

        if ($idEncodedPath = $this->getRequest()->getParam('current_tree_path')) {
            $path = $this->_cmsWysiwygImages->idDecode($idEncodedPath);
        } else {
            $path = $this->_coreRegistry->registry('storage')->getSession()->getCurrentPath();
        }

        if (strlen($path)) {
            $path = str_replace($this->_cmsWysiwygImages->getStorageRoot(), '', $path);
            $relative = [];
            foreach (explode('/', $path) as $dirName) {
                if ($dirName) {
                    $relative[] = $dirName;
                    $treePath[] = $this->_cmsWysiwygImages->idEncode(implode('/', $relative));
                }
            }
        }

        return $treePath;
    }

    public function getTreeWidgetOptions()
    {
        return [
            "folderTree" => [
                "rootName" => $this->getRootNodeName(),
                "url" => $this->getTreeLoaderUrl(),
                "currentPath" => array_reverse($this->getTreeCurrentPath()),
            ]
        ];
    }
}