Fixing UI for 2.1 data changes

app/imports/api/engine/computation/utility/walkdown.js

@@ -1,8 +0,0 @@
-export default function walkDown(tree, callback){
-  let stack = [...tree];
-  while(stack.length){
-    let node = stack.pop();
-    callback(node, stack);
-    stack.push(...node.children);
-  }
-}

app/imports/api/engine/computation/utility/walkdown.ts

@@ -0,0 +1,14 @@
+import { TreeDoc } from '/imports/api/parenting/ChildSchema';
+import { TreeNode } from '/imports/api/parenting/parentingFunctions';
+
+export default function walkDown<T extends TreeDoc>(
+  trees: TreeNode<T>[], callback: (node: TreeNode<T>, stack: TreeNode<T>[]) => any
+) {
+  const stack = [...trees];
+  while (stack.length) {
+    const node = stack.pop();
+    if (!node) return;
+    callback(node, stack);
+    stack.push(...node.children);
+  }
+}