From fd1995e1e36bf799ba5fa283b8be7f3973d3a51a Mon Sep 17 00:00:00 2001
From: Hans Larsen <hans@hansl.ca>
Date: Fri, 27 Jul 2018 11:44:17 -0700
Subject: [PATCH] fix(@angular-devkit/schematics): implement optimize() for
 HostTree

Its only used by old Schematics library, which can end up in there. Since optimization
is only a thing for VirtualTree, HostTree returns itself.
---
 packages/angular_devkit/schematics/src/tree/host-tree.ts | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/packages/angular_devkit/schematics/src/tree/host-tree.ts b/packages/angular_devkit/schematics/src/tree/host-tree.ts
index 3772835dad4d..70b4fd710023 100644
--- a/packages/angular_devkit/schematics/src/tree/host-tree.ts
+++ b/packages/angular_devkit/schematics/src/tree/host-tree.ts
@@ -134,6 +134,12 @@ export class HostTree implements Tree {
     return this._record.willRename(path);
   }
 
+  // This can be used by old Schematics library with new Trees in some corner cases.
+  // TODO: remove this for 7.0
+  optimize() {
+    return this;
+  }
+
   branch(): Tree {
     const branchedTree = new HostTree(this._backend);
     branchedTree._record = this._record.clone();