adding fix and tests

Author: navya9singh

src/services/refactors/moveToFile.ts

@@ -1148,6 +1148,9 @@ export function getExistingLocals(sourceFile: SourceFile, statements: readonly S
             if (symbol.valueDeclaration && getSourceFileOfNode(symbol.valueDeclaration).path === sourceFile.path) {
                 existingLocals.add(symbol);
             }
+            else if (!symbol.valueDeclaration && symbol.parent?.valueDeclaration && getSourceFileOfNode(symbol.parent.valueDeclaration).path === sourceFile.path) {
+                existingLocals.add(symbol);
+            }
         });
     }
     return existingLocals;

tests/cases/fourslash/moveToFile_noSelfImports3.ts

@@ -0,0 +1,25 @@
+/// <reference path='fourslash.ts' />
+
+//@Filename: /b.ts
+////import { ISomething } from './a';
+////
+////export function [|func|](something: ISomething) {
+////}
+
+// @Filename: /a.ts
+////export interface ISomething {
+////}
+
+verify.moveToFile({
+    newFileContents: {
+        "/a.ts": `export interface ISomething {
+}
+export function func(something: ISomething) {
+}
+`,
+
+        "/b.ts": `
+`,
+    },
+    interactiveRefactorArguments: { targetFile: "/a.ts" }
+});

tests/cases/fourslash/moveToFile_noSelfImports4.ts

@@ -0,0 +1,21 @@
+/// <reference path='fourslash.ts' />
+
+//@Filename: /b.ts
+////export type BaseTest = string;
+
+// @Filename: /a.ts
+////import { BaseTest } from "./b";
+////
+////export type [|Test|] = BaseTest;
+
+verify.moveToFile({
+    newFileContents: {
+        "/b.ts": `export type BaseTest = string;
+export type Test = BaseTest;
+`,
+
+        "/a.ts": `
+`,
+    },
+    interactiveRefactorArguments: { targetFile: "/b.ts" }
+});