From 59fca7fc30bfbcdde8d5b3e544bdf09da5fa9e9a Mon Sep 17 00:00:00 2001
From: Ron Buckton <ron.buckton@microsoft.com>
Date: Fri, 10 Nov 2017 16:26:16 -0800
Subject: [PATCH] Fix crash when running tsc with -diagnostics

---
 src/compiler/performance.ts | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/compiler/performance.ts b/src/compiler/performance.ts
index 225b34de9c..104148ed4a 100644
--- a/src/compiler/performance.ts
+++ b/src/compiler/performance.ts
@@ -10,7 +10,8 @@ namespace ts {
 namespace ts.performance {
     declare const onProfilerEvent: { (markName: string): void; profiler: boolean; };
 
-    const profilerEvent: (markName: string) => void = typeof onProfilerEvent === "function" && onProfilerEvent.profiler === true ? onProfilerEvent : noop;
+    // NOTE: cannot use ts.noop as core.ts loads after this
+    const profilerEvent: (markName: string) => void = typeof onProfilerEvent === "function" && onProfilerEvent.profiler === true ? onProfilerEvent : () => { /*empty*/ };
 
     let enabled = false;
     let profilerStart = 0;