visit question token

src/compiler/factory.ts

@@ -314,10 +314,11 @@ namespace ts {
         return node;
     }
 
-    export function updateProperty(node: PropertyDeclaration, decorators: Decorator[] | undefined, modifiers: Modifier[] | undefined, name: PropertyName, type: TypeNode | undefined, initializer: Expression | undefined) {
+    export function updateProperty(node: PropertyDeclaration, decorators: Decorator[] | undefined, modifiers: Modifier[] | undefined, name: string | PropertyName, questionToken: QuestionToken | undefined, type: TypeNode | undefined, initializer: Expression | undefined) {
         return node.decorators !== decorators
             || node.modifiers !== modifiers
             || node.name !== name
+            || node.questionToken !== questionToken
             || node.type !== type
             || node.initializer !== initializer
             ? updateNode(createProperty(decorators, modifiers, name, node.questionToken, type, initializer), node)
@@ -360,6 +361,7 @@ namespace ts {
             || node.modifiers !== modifiers
             || node.asteriskToken !== asteriskToken
             || node.name !== name
+            || node.questionToken !== questionToken
             || node.typeParameters !== typeParameters
             || node.parameters !== parameters
             || node.type !== type

src/compiler/visitor.ts

@@ -270,6 +270,7 @@ 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).type, visitor, isTypeNode),
                     visitNode((<PropertyDeclaration>node).initializer, visitor, isExpression));
 

tests/cases/fourslash/codeFixClassImplementInterfaceOptionalProperty.ts

@@ -0,0 +1,13 @@
+/// <reference path='fourslash.ts' />
+
+//// interface IPerson {
+////     name: string;
+////     birthday?: string;
+//// }
+//// 
+//// class Person implements IPerson {[| |]}
+
+verify.rangeAfterCodeFix(`
+    name: string;
+    birthday?: string;
+`);