Remove uses of visitNodes and visitNode in visitEachChild

src/compiler/visitorPublic.ts

@@ -616,7 +616,7 @@ namespace ts {
                     nodeVisitor(node.argument, visitor, isTypeNode),
                     nodeVisitor(node.assertions, visitor, isNode),
                     nodeVisitor(node.qualifier, visitor, isEntityName),
-                    visitNodes(node.typeArguments, visitor, isTypeNode),
+                    nodesVisitor(node.typeArguments, visitor, isTypeNode),
                     node.isTypeOf
                 );
 
@@ -630,10 +630,10 @@ namespace ts {
             case SyntaxKind.NamedTupleMember:
                 Debug.type<NamedTupleMember>(node);
                 return factory.updateNamedTupleMember(node,
-                    visitNode(node.dotDotDotToken, visitor, isDotDotDotToken),
-                    visitNode(node.name, visitor, isIdentifier),
-                    visitNode(node.questionToken, visitor, isQuestionToken),
-                    visitNode(node.type, visitor, isTypeNode),
+                    nodeVisitor(node.dotDotDotToken, visitor, isDotDotDotToken),
+                    nodeVisitor(node.name, visitor, isIdentifier),
+                    nodeVisitor(node.questionToken, visitor, isQuestionToken),
+                    nodeVisitor(node.type, visitor, isTypeNode),
                 );
 
             case SyntaxKind.ParenthesizedType:
@@ -761,7 +761,7 @@ namespace ts {
                 Debug.type<TaggedTemplateExpression>(node);
                 return factory.updateTaggedTemplateExpression(node,
                     nodeVisitor(node.tag, visitor, isExpression),
-                    visitNodes(node.typeArguments, visitor, isTypeNode),
+                    nodesVisitor(node.typeArguments, visitor, isTypeNode),
                     nodeVisitor(node.template, visitor, isTemplateLiteral));
 
             case SyntaxKind.TypeAssertionExpression:

src/services/formatting/formatting.ts

@@ -691,6 +691,7 @@ namespace ts.formatting {
                 undecoratedParentStartLine: number,
                 isListItem: boolean,
                 isFirstListItem?: boolean): number {
+                Debug.assert(!nodeIsSynthesized(child));
 
                 if (nodeIsMissing(child)) {
                     return inheritedIndentation;
@@ -778,6 +779,7 @@ namespace ts.formatting {
                 parentStartLine: number,
                 parentDynamicIndentation: DynamicIndentation): void {
                 Debug.assert(isNodeArray(nodes));
+                Debug.assert(!nodeIsSynthesized(nodes));
 
                 const listStartToken = getOpenTokenForList(parent, nodes);
 

tests/cases/fourslash/extractFunctionWithSyntheticNodes.ts

@@ -0,0 +1,62 @@
+/// <reference path="fourslash.ts" />
+
+// @filename: /project/tsconfig.json
+//// {}
+
+// @filename: /project/index.esm.d.ts
+//// export declare class Chart {
+////     constructor(config: ChartConfiguration);
+//// }
+//// 
+//// export interface ChartConfiguration {
+////     options?: Partial<TickOptions>;
+//// }
+//// 
+//// export interface TickOptions {
+////     callback: (this: Scale, tickValue: number | string) => string | string[] | number | number[] | null | undefined;
+//// }
+//// 
+//// export interface CoreScaleOptions {
+////     opt: boolean;
+//// }
+////   
+//// export interface Scale<O extends CoreScaleOptions = CoreScaleOptions> {
+////     opts: O;
+////     getLabelForValue(value: number): string;
+//// }
+
+// @filename: /project/options.ts
+//// import { Chart } from './index.esm';
+//// 
+//// const chart = new Chart({
+////     options: {
+////         callback(tickValue) {
+////             /*a*/const value = this.getLabelForValue(tickValue as number);/*b*/
+////             return '$' + value;
+////         }
+////     }
+//// });
+
+goTo.file("/project/options.ts");
+verify.noErrors();
+goTo.select("a", "b");
+edit.applyRefactor({
+    refactorName: "Extract Symbol",
+    actionName: "function_scope_0",
+    actionDescription: "Extract to inner function in method 'callback'",
+    newContent:
+`import { Chart } from './index.esm';
+
+const chart = new Chart({
+    options: {
+        callback(tickValue) {
+            const value = /*RENAME*/newFunction.call(this);
+            return '$' + value;
+
+            function newFunction(this: import("/project/index.esm").Scale<import("/project/index.esm").CoreScaleOptions>) {
+                return this.getLabelForValue(tickValue as number);
+            }
+        }
+    }
+});`
+});