From 9c401b4dbbbab2e1f73d018a8b292000dff06277 Mon Sep 17 00:00:00 2001
From: Anders Hejlsberg <andersh@microsoft.com>
Date: Sun, 28 Apr 2019 13:56:11 -0700
Subject: [PATCH] Remove over-eager check of AccessFlags.Writing in
 getIndexedAccessType

---
 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 8ee0a4c051996..41a3432b5aca9 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -10080,7 +10080,7 @@ namespace ts {
                         error(indexNode, Diagnostics.Type_0_cannot_be_used_as_an_index_type, typeToString(indexType));
                         return indexInfo.type;
                     }
-                    if (indexInfo.isReadonly && (accessFlags & AccessFlags.Writing || accessExpression && (isAssignmentTarget(accessExpression) || isDeleteTarget(accessExpression)))) {
+                    if (indexInfo.isReadonly && accessExpression && (isAssignmentTarget(accessExpression) || isDeleteTarget(accessExpression))) {
                         if (accessExpression) {
                             error(accessExpression, Diagnostics.Index_signature_in_type_0_only_permits_reading, typeToString(objectType));
                             return indexInfo.type;