From 723ee8a35e6bc7ea7791ce03cfb19f3300043a1b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=8E=8B=E6=96=87=E7=92=90?= <kingwenlu@gmail.com>
Date: Thu, 2 Aug 2018 18:33:15 +0800
Subject: [PATCH 1/3] visit exclamation token

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

diff --git a/src/compiler/visitor.ts b/src/compiler/visitor.ts
index 2cfb469f15296..9a7c1c41cfdb0 100644
--- a/src/compiler/visitor.ts
+++ b/src/compiler/visitor.ts
@@ -268,7 +268,7 @@ namespace ts {
                     nodesVisitor((<PropertyDeclaration>node).decorators, visitor, isDecorator),
                     nodesVisitor((<PropertyDeclaration>node).modifiers, visitor, isModifier),
                     visitNode((<PropertyDeclaration>node).name, visitor, isPropertyName),
-                    visitNode((<PropertyDeclaration>node).questionToken, tokenVisitor, isToken),
+                    (visitNode((<PropertyDeclaration>node).questionToken, tokenVisitor, isToken), visitNode((<PropertyDeclaration>node).exclamationToken, tokenVisitor, isToken)),
                     visitNode((<PropertyDeclaration>node).type, visitor, isTypeNode),
                     visitNode((<PropertyDeclaration>node).initializer, visitor, isExpression));
 

From 22672f33877b2170c2b2f6edb806ce16d57f66d1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=8E=8B=E6=96=87=E7=92=90?= <kingwenlu@gmail.com>
Date: Fri, 7 Sep 2018 11:45:32 +0800
Subject: [PATCH 2/3] add comment

---
 src/compiler/visitor.ts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/compiler/visitor.ts b/src/compiler/visitor.ts
index 9a7c1c41cfdb0..5fc0b0ccc711c 100644
--- a/src/compiler/visitor.ts
+++ b/src/compiler/visitor.ts
@@ -268,6 +268,7 @@ namespace ts {
                     nodesVisitor((<PropertyDeclaration>node).decorators, visitor, isDecorator),
                     nodesVisitor((<PropertyDeclaration>node).modifiers, visitor, isModifier),
                     visitNode((<PropertyDeclaration>node).name, visitor, isPropertyName),
+                    // QuestionToken and ExclamationToken is uniqued in Property Declaration and the signature of 'updateProperty' is that too
                     (visitNode((<PropertyDeclaration>node).questionToken, tokenVisitor, isToken), visitNode((<PropertyDeclaration>node).exclamationToken, tokenVisitor, isToken)),
                     visitNode((<PropertyDeclaration>node).type, visitor, isTypeNode),
                     visitNode((<PropertyDeclaration>node).initializer, visitor, isExpression));

From 6e0b39e39976a59d9df2bfceffbb90ec76032707 Mon Sep 17 00:00:00 2001
From: Ron Buckton <ron.buckton@microsoft.com>
Date: Tue, 23 Apr 2019 21:27:06 -0500
Subject: [PATCH 3/3] Update src/compiler/visitor.ts

Co-Authored-By: Kingwl <kingwenlu@gmail.com>
---
 src/compiler/visitor.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/compiler/visitor.ts b/src/compiler/visitor.ts
index 16880972b69c7..c5cb3f87fc50d 100644
--- a/src/compiler/visitor.ts
+++ b/src/compiler/visitor.ts
@@ -269,7 +269,7 @@ namespace ts {
                     nodesVisitor((<PropertyDeclaration>node).modifiers, visitor, isModifier),
                     visitNode((<PropertyDeclaration>node).name, visitor, isPropertyName),
                     // QuestionToken and ExclamationToken is uniqued in Property Declaration and the signature of 'updateProperty' is that too
-                    (visitNode((<PropertyDeclaration>node).questionToken, tokenVisitor, isToken), visitNode((<PropertyDeclaration>node).exclamationToken, tokenVisitor, isToken)),
+                    visitNode((<PropertyDeclaration>node).questionToken || (<PropertyDeclaration>node).exclamationToken, tokenVisitor, isToken),
                     visitNode((<PropertyDeclaration>node).type, visitor, isTypeNode),
                     visitNode((<PropertyDeclaration>node).initializer, visitor, isExpression));