From b0aa913d513ae21e7cc958c6a3390fa460403e9d Mon Sep 17 00:00:00 2001
From: Peter Burns <rictic@google.com>
Date: Mon, 10 Sep 2018 20:00:27 -0700
Subject: [PATCH] Add cast for compilation

this._target is an Element, getFlattenedNodes accepts and HTMLElement

Upcoming version of closure compiler type checks this better
---
 lib/utils/flattened-nodes-observer.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/utils/flattened-nodes-observer.js b/lib/utils/flattened-nodes-observer.js
index 87802d5335..dbbd05d40f 100644
--- a/lib/utils/flattened-nodes-observer.js
+++ b/lib/utils/flattened-nodes-observer.js
@@ -252,7 +252,8 @@ export class FlattenedNodesObserver {
       addedNodes: [],
       removedNodes: []
     };
-    let newNodes = this.constructor.getFlattenedNodes(this._target);
+    let newNodes = this.constructor.getFlattenedNodes(
+        /** @type {!HTMLElement} */ (this._target));
     let splices = calculateSplices(newNodes,
       this._effectiveNodes);
     // process removals