From d009d8efcffc85a0846b6c7008fc54f5bd635ab3 Mon Sep 17 00:00:00 2001
From: Andy <anhans@microsoft.com>
Date: Tue, 17 Apr 2018 10:41:53 -0700
Subject: [PATCH] Fix bug: IfStatement#elseStatement can be undefined (#23467)

---
 src/services/outliningElementsCollector.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/services/outliningElementsCollector.ts b/src/services/outliningElementsCollector.ts
index 9d590ffef61..65888305d81 100644
--- a/src/services/outliningElementsCollector.ts
+++ b/src/services/outliningElementsCollector.ts
@@ -21,7 +21,7 @@ namespace ts.OutliningElementsCollector {
             if (span) out.push(span);
 
             depthRemaining--;
-            if (isIfStatement(n) && isIfStatement(n.elseStatement)) {
+            if (isIfStatement(n) && n.elseStatement && isIfStatement(n.elseStatement)) {
                 // Consider an 'else if' to be on the same depth as the 'if'.
                 walk(n.expression);
                 walk(n.thenStatement);