From 95670c62519d1b0e105cbcb1e93924aa696386fb Mon Sep 17 00:00:00 2001
From: Ryan Cavanaugh <RyanCavanaugh@users.noreply.github.com>
Date: Mon, 24 Oct 2016 10:14:41 -0700
Subject: [PATCH] Perform a useful comparison. Fixes #11805

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

diff --git a/src/compiler/program.ts b/src/compiler/program.ts
index b619f005ded..a9c64f3ecbe 100644
--- a/src/compiler/program.ts
+++ b/src/compiler/program.ts
@@ -474,7 +474,7 @@ namespace ts {
                 (oldOptions.baseUrl !== options.baseUrl) ||
                 (oldOptions.maxNodeModuleJsDepth !== options.maxNodeModuleJsDepth) ||
                 !arrayIsEqualTo(oldOptions.lib, options.lib) ||
-                !arrayIsEqualTo(oldOptions.typeRoots, oldOptions.typeRoots) ||
+                !arrayIsEqualTo(oldOptions.typeRoots, options.typeRoots) ||
                 !arrayIsEqualTo(oldOptions.rootDirs, options.rootDirs) ||
                 !equalOwnProperties(oldOptions.paths, options.paths)) {
                 return false;