From e5816491bab1a33e6c98a3b599d7ec868f502789 Mon Sep 17 00:00:00 2001
From: Anders Hejlsberg <andersh@microsoft.com>
Date: Thu, 17 Jan 2019 06:06:07 -0800
Subject: [PATCH] Allow rest parameter type to be a readonly array or tuple

---
 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 5fc4ca5b0b0..c126b5458f1 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -23180,7 +23180,7 @@ namespace ts {
 
             // Only check rest parameter type if it's not a binding pattern. Since binding patterns are
             // not allowed in a rest parameter, we already have an error from checkGrammarParameterList.
-            if (node.dotDotDotToken && !isBindingPattern(node.name) && !isTypeAssignableTo(getTypeOfSymbol(node.symbol), anyArrayType)) {
+            if (node.dotDotDotToken && !isBindingPattern(node.name) && !isTypeAssignableTo(getTypeOfSymbol(node.symbol), anyReadonlyArrayType)) {
                 error(node, Diagnostics.A_rest_parameter_must_be_of_an_array_type);
             }
         }