install gulp to process code

node_modules/undertaker/lib/helpers/buildTree.js

@@ -0,0 +1,27 @@
+'use strict';
+
+var metadata = require('./metadata');
+
+function buildTree(tasks) {
+  return Object.values(tasks).map(function(task) {
+    var meta = metadata.get(task);
+    if (meta) {
+      return meta.tree;
+    }
+
+    var name = task.displayName || task.name || '<anonymous>';
+    meta = {
+      name: name,
+      tree: {
+        label: name,
+        type: 'function',
+        nodes: [],
+      },
+    };
+
+    metadata.set(task, meta);
+    return meta.tree;
+  });
+}
+
+module.exports = buildTree;