From b650d7d06b150477c340bd0f28b727031a723a6b Mon Sep 17 00:00:00 2001
From: Anders Hejlsberg <andersh@microsoft.com>
Date: Fri, 22 Jun 2018 06:26:52 -1000
Subject: [PATCH] Fix issue

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

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 2b2d3acd712..fd8123a5571 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -6226,7 +6226,7 @@ namespace ts {
                 /*resolvedTypePredicate*/ undefined, sig.minArgumentCount, sig.hasRestParameter, sig.hasLiteralTypes);
         }
 
-        function getExpandedParameters(sig: Signature): Symbol[] {
+        function getExpandedParameters(sig: Signature): ReadonlyArray<Symbol> {
             if (sig.hasRestParameter) {
                 const restIndex = sig.parameters.length - 1;
                 const restParameter = sig.parameters[restIndex];