Don't use text change's createNewFile for existing empty file (#54358)

src/services/refactors/moveToFile.ts

@@ -176,8 +176,8 @@ registerRefactor(refactorNameForMoveToFile, {
 function doChange(context: RefactorContext, oldFile: SourceFile, targetFile: string, program: Program, toMove: ToMove, changes: textChanges.ChangeTracker, host: LanguageServiceHost, preferences: UserPreferences): void {
     const checker = program.getTypeChecker();
     const usage = getUsageInfo(oldFile, toMove.all, checker);
-    //For a new file or an existing blank target file
-    if (!host.fileExists(targetFile) || host.fileExists(targetFile) && program.getSourceFile(targetFile)?.statements.length === 0) {
+    //For a new file
+    if (!host.fileExists(targetFile)) {
         changes.createNewFile(oldFile, targetFile, getNewStatementsAndRemoveFromOldFile(oldFile, targetFile, usage, changes, toMove, program, host, preferences));
         addNewFileToTsconfig(program, changes, oldFile.fileName, targetFile, hostGetCanonicalFileName(host));
     }
@@ -189,7 +189,15 @@ function doChange(context: RefactorContext, oldFile: SourceFile, targetFile: str
 }
 
 function getNewStatementsAndRemoveFromOldFile(
-    oldFile: SourceFile, targetFile: string | SourceFile, usage: UsageInfo, changes: textChanges.ChangeTracker, toMove: ToMove, program: Program, host: LanguageServiceHost, preferences: UserPreferences, importAdder?: codefix.ImportAdder
+    oldFile: SourceFile,
+    targetFile: string | SourceFile,
+    usage: UsageInfo,
+    changes: textChanges.ChangeTracker,
+    toMove: ToMove,
+    program: Program,
+    host: LanguageServiceHost,
+    preferences: UserPreferences,
+    importAdder?: codefix.ImportAdder
 ) {
     const checker = program.getTypeChecker();
     const prologueDirectives = takeWhile(oldFile.statements, isPrologueDirective);
@@ -218,6 +226,9 @@ function getNewStatementsAndRemoveFromOldFile(
         if (targetFile.statements.length > 0) {
             changes.insertNodesAfter(targetFile, targetFile.statements[targetFile.statements.length - 1], body);
         }
+        else {
+            changes.insertNodesAtEndOfFile(targetFile, body, /*blankLineBetween*/ false);
+        }
         if (imports.length > 0) {
             insertImports(changes, targetFile, imports, /*blankLineBetween*/ true, preferences);
         }

src/services/textChanges.ts

@@ -631,6 +631,25 @@ export class ChangeTracker {
         }
     }
 
+    public insertNodesAtEndOfFile(
+        sourceFile: SourceFile,
+        newNodes: readonly Statement[],
+        blankLineBetween: boolean): void {
+        this.insertAtEndOfFile(sourceFile, newNodes, blankLineBetween);
+    }
+
+    private insertAtEndOfFile(
+        sourceFile: SourceFile,
+        insert: readonly Statement[],
+        blankLineBetween: boolean): void {
+        const pos = sourceFile.end + 1;
+        const options = {
+            prefix: this.newLineCharacter,
+            suffix: this.newLineCharacter + (blankLineBetween ? this.newLineCharacter : ""),
+        };
+        this.insertNodesAt(sourceFile, pos, insert, options);
+    }
+
     private insertStatementsInNewFile(fileName: string, statements: readonly (Statement | SyntaxKind.NewLineTrivia)[], oldFile?: SourceFile): void {
         if (!this.newFileChanges) {
             this.newFileChanges = createMultiMap<string, NewFileInsertion>();

src/services/types.ts

@@ -652,7 +652,7 @@ export interface LanguageService {
      * arguments for any interactive action before offering it.
      */
     getApplicableRefactors(fileName: string, positionOrRange: number | TextRange, preferences: UserPreferences | undefined, triggerReason?: RefactorTriggerReason, kind?: string, includeInteractiveActions?: boolean): ApplicableRefactorInfo[];
-    getEditsForRefactor(fileName: string, formatOptions: FormatCodeSettings, positionOrRange: number | TextRange, refactorName: string, actionName: string, preferences: UserPreferences | undefined, includeInteractiveActions?: InteractiveRefactorArguments): RefactorEditInfo | undefined;
+    getEditsForRefactor(fileName: string, formatOptions: FormatCodeSettings, positionOrRange: number | TextRange, refactorName: string, actionName: string, preferences: UserPreferences | undefined, interactiveRefactorArguments?: InteractiveRefactorArguments): RefactorEditInfo | undefined;
     getMoveToRefactoringFileSuggestions(fileName: string, positionOrRange: number | TextRange, preferences: UserPreferences | undefined, triggerReason?: RefactorTriggerReason, kind?: string): { newFileName: string, files: string[] };
     organizeImports(args: OrganizeImportsArgs, formatOptions: FormatCodeSettings, preferences: UserPreferences | undefined): readonly FileTextChanges[];
     getEditsForFileRename(oldFilePath: string, newFilePath: string, formatOptions: FormatCodeSettings, preferences: UserPreferences | undefined): readonly FileTextChanges[];