fix trailing comma in accessor generator

src/services/refactors/generateGetAccessorAndSetAccessor.ts

@@ -204,7 +204,9 @@ namespace ts.refactor.generateGetAccessorAndSetAccessor {
     function insertAccessor(changeTracker: textChanges.ChangeTracker, file: SourceFile, accessor: AccessorDeclaration, declaration: AcceptedDeclaration, container: ContainerDeclaration) {
         isParameterPropertyDeclaration(declaration)
             ? changeTracker.insertNodeAtClassStart(file, <ClassLikeDeclaration>container, accessor)
-            : changeTracker.insertNodeAfter(file, declaration, accessor);
+            : isPropertyAssignment(declaration)
+                ? changeTracker.insertNodeAfterComma(file, declaration, accessor)
+                : changeTracker.insertNodeAfter(file, declaration, accessor);
     }
 
     function updateReadonlyPropertyInitializerStatementConstructor(changeTracker: textChanges.ChangeTracker, context: RefactorContext, constructor: ConstructorDeclaration, fieldName: AcceptedNameType, originalName: AcceptedNameType) {

src/services/textChanges.ts

@@ -320,10 +320,14 @@ namespace ts.textChanges {
             return this.replaceRangeWithNodes(sourceFile, getAdjustedRange(sourceFile, startNode, endNode, options), newNodes, options);
         }
 
+        private nextCommaToken (sourceFile: SourceFile, node: Node): Node | undefined {
+            const next = findNextToken(node, node.parent, sourceFile);
+            return next && next.kind === SyntaxKind.CommaToken ? next : undefined;
+        }
+
         public replacePropertyAssignment(sourceFile: SourceFile, oldNode: PropertyAssignment, newNode: PropertyAssignment) {
-            return this.replaceNode(sourceFile, oldNode, newNode, {
-                suffix: "," + this.newLineCharacter
-            });
+            const suffix = this.nextCommaToken(sourceFile, oldNode) ? "" : ("," + this.newLineCharacter);
+            return this.replaceNode(sourceFile, oldNode, newNode, { suffix });
         }
 
         private insertNodeAt(sourceFile: SourceFile, pos: number, newNode: Node, options: InsertNodeOptions = {}) {
@@ -465,6 +469,11 @@ namespace ts.textChanges {
             }
         }
 
+        public insertNodeAfterComma(sourceFile: SourceFile, after: Node, newNode: Node): void {
+            const endPosition = this.insertNodeAfterWorker(sourceFile, this.nextCommaToken(sourceFile, after) || after, newNode);
+            this.insertNodeAt(sourceFile, endPosition, newNode, this.getInsertNodeAfterOptions(sourceFile, after));
+        }
+
         public insertNodeAfter(sourceFile: SourceFile, after: Node, newNode: Node): void {
             const endPosition = this.insertNodeAfterWorker(sourceFile, after, newNode);
             this.insertNodeAt(sourceFile, endPosition, newNode, this.getInsertNodeAfterOptions(sourceFile, after));

tests/cases/fourslash/refactorConvertToGetAccessAndSetAccess34.ts

@@ -0,0 +1,21 @@
+/// <reference path='fourslash.ts' />
+
+//// const A = {
+////     /*a*/a/*b*/: 1,
+//// };
+
+goTo.select("a", "b");
+edit.applyRefactor({
+    refactorName: "Generate 'get' and 'set' accessors",
+    actionName: "Generate 'get' and 'set' accessors",
+    actionDescription: "Generate 'get' and 'set' accessors",
+    newContent: `const A = {
+    /*RENAME*/_a: 1,
+    get a() {
+        return this._a;
+    },
+    set a(value) {
+        this._a = value;
+    },
+};`,
+});