From cbcb59c95c9baf10a64cc69e9c0fba85b65d9e4f Mon Sep 17 00:00:00 2001
From: Anders Hejlsberg <andersh@microsoft.com>
Date: Tue, 15 Oct 2019 11:11:14 -0700
Subject: [PATCH] Properly attach alias symbol to `readonly T[]` types

---
 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 78f8b965ca1..4df420185ec 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -12438,7 +12438,7 @@ namespace ts {
 
         function getAliasSymbolForTypeNode(node: TypeNode) {
             let host = node.parent;
-            while (isParenthesizedTypeNode(host)) {
+            while (isParenthesizedTypeNode(host) || isTypeOperatorNode(host) && host.operator === SyntaxKind.ReadonlyKeyword) {
                 host = host.parent;
             }
             return isTypeAlias(host) ? getSymbolOfNode(host) : undefined;