first commit

common/resources/client/ui/tree/render-tree.ts

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+import {TreeItemRenderer} from './tree-item';
+import {cloneElement} from 'react';
+import {TreeNode} from './tree';
+
+interface RenderTreeProps<T extends TreeNode> {
+  nodes: T[];
+  parentNode?: T;
+  itemRenderer: TreeItemRenderer<T>;
+  level?: number;
+}
+export function renderTree<T extends TreeNode>({
+  nodes,
+  itemRenderer,
+  parentNode,
+  level,
+}: RenderTreeProps<T>) {
+  return nodes.map((node, index) => {
+    return cloneElement(itemRenderer(node), {
+      level: level == undefined ? 0 : level + 1,
+      index,
+      node,
+      parentNode,
+      key: node.id,
+      itemRenderer,
+    });
+  });
+}