From a5b93a7137cf18b51696c385525672e09a3db22b Mon Sep 17 00:00:00 2001
From: Yarom Shoval <yarom.adi@gmail.com>
Date: Fri, 19 May 2017 16:32:44 +0300
Subject: [PATCH] VNode key property can be undefined

Because actually it can be undefined:
https://github.com/snabbdom/snabbdom/blob/4adbd971cba738c38d6158b38fdb81a6509d1553/src/vnode.ts#L44
---
 src/snabbdom.ts | 2 +-
 src/vnode.ts    | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/snabbdom.ts b/src/snabbdom.ts
index 9568db5..ed7b524 100644
--- a/src/snabbdom.ts
+++ b/src/snabbdom.ts
@@ -29,7 +29,7 @@ type ArraysOf<T> = {
 type ModuleHooks = ArraysOf<Module>;
 
 function createKeyToOldIdx(children: Array<VNode>, beginIdx: number, endIdx: number): KeyToIndexMap {
-  let i: number, map: KeyToIndexMap = {}, key: Key, ch;
+  let i: number, map: KeyToIndexMap = {}, key: Key | undefined, ch;
   for (i = beginIdx; i <= endIdx; ++i) {
     ch = children[i];
     if (ch != null) {
diff --git a/src/vnode.ts b/src/vnode.ts
index 9c1b68c..1a6d4a7 100644
--- a/src/vnode.ts
+++ b/src/vnode.ts
@@ -16,7 +16,7 @@ export interface VNode {
   children: Array<VNode | string> | undefined;
   elm: Node | undefined;
   text: string | undefined;
-  key: Key;
+  key: Key | undefined;
 }
 
 export interface VNodeData {