feat: sync mixly root files and common folder

mixly/common/modules/mixly-modules/web/file-tree.js

@@ -0,0 +1,47 @@
+goog.loadJs('web', () => {
+
+goog.require('path');
+goog.require('Mixly.FileTree');
+goog.require('Mixly.Web.FS');
+goog.provide('Mixly.Web.FileTree');
+
+const { FileTree, Web } = Mixly;
+const { FS } = Web;
+
+class FileTreeExt extends FileTree {
+    constructor() {
+        super(FS);
+    }
+
+    async readFolder(inPath) {
+        const fs = this.getFS();
+        const status = await fs.isDirectory(inPath);
+        let output = [];
+        if (!status) {
+            return output;
+        }
+        const children = await fs.readDirectory(inPath);
+        for (let data of children) {
+            const dataPath = path.join(inPath, data);
+            if (await fs.isDirectory(dataPath)) {
+                const isDirEmpty = await fs.isDirectoryEmpty(dataPath);
+                output.push({
+                    type: 'folder',
+                    id: dataPath,
+                    children: !isDirEmpty
+                });
+            } else {
+                output.push({
+                    type: 'file',
+                    id: dataPath,
+                    children: false
+                });
+            }
+        }
+        return output;
+    }
+}
+
+Web.FileTree = FileTreeExt;
+
+});