1 files changed, 9 insertions, 8 deletions
diff --git a/deps/npm/lib/install/copy-tree.js b/deps/npm/lib/install/copy-tree.js
index 2bf7064f33..a5b558cf59 100644
--- a/deps/npm/lib/install/copy-tree.js
+++ b/deps/npm/lib/install/copy-tree.js
@@ -1,26 +1,27 @@
 'use strict'
 var createNode = require('./node.js').create
-module.exports = function (tree) {
-  return copyTree(tree, {})
+module.exports = function (tree, filter) {
+  return copyTree(tree, {}, filter)
 }
 
-function copyTree (tree, cache) {
+function copyTree (tree, cache, filter) {
+  if (filter && !filter(tree)) { return null }
   if (cache[tree.path]) { return cache[tree.path] }
   var newTree = cache[tree.path] = createNode(Object.assign({}, tree))
-  copyModuleList(newTree, 'children', cache)
+  copyModuleList(newTree, 'children', cache, filter)
   newTree.children.forEach(function (child) {
     child.parent = newTree
   })
-  copyModuleList(newTree, 'requires', cache)
-  copyModuleList(newTree, 'requiredBy', cache)
+  copyModuleList(newTree, 'requires', cache, filter)
+  copyModuleList(newTree, 'requiredBy', cache, filter)
   return newTree
 }
 
-function copyModuleList (tree, key, cache) {
+function copyModuleList (tree, key, cache, filter) {
   var newList = []
   if (tree[key]) {
     tree[key].forEach(function (child) {
-      const copy = copyTree(child, cache)
+      const copy = copyTree(child, cache, filter)
       if (copy) {
         newList.push(copy)
       }