From 739d729ecce60771c23723aad932ab35a34df82d Mon Sep 17 00:00:00 2001
From: Andrew Branch <andrewbranch@users.noreply.github.com>
Date: Thu, 30 Jan 2025 13:49:26 -0800
Subject: [PATCH] [moveToFile] Fix symbols with empty `declarations` being
 treated as importable (#61084)

---
 src/services/refactors/moveToFile.ts          |  2 +-
 tests/cases/fourslash/moveToFile_undefined.ts | 15 +++++++++++++++
 2 files changed, 16 insertions(+), 1 deletion(-)
 create mode 100644 tests/cases/fourslash/moveToFile_undefined.ts

diff --git a/src/services/refactors/moveToFile.ts b/src/services/refactors/moveToFile.ts
index 6245fe4903dcc..18fd421d6d0ee 100644
--- a/src/services/refactors/moveToFile.ts
+++ b/src/services/refactors/moveToFile.ts
@@ -886,7 +886,7 @@ export function getUsageInfo(oldFile: SourceFile, toMove: readonly Statement[],
     const unusedImportsFromOldFile = new Set<Symbol>();
     for (const statement of toMove) {
         forEachReference(statement, checker, enclosingRange, (symbol, isValidTypeOnlyUseSite) => {
-            if (!symbol.declarations) {
+            if (!some(symbol.declarations)) {
                 return;
             }
             if (existingTargetLocals.has(skipAlias(symbol, checker))) {
diff --git a/tests/cases/fourslash/moveToFile_undefined.ts b/tests/cases/fourslash/moveToFile_undefined.ts
new file mode 100644
index 0000000000000..42ce03ec5abfe
--- /dev/null
+++ b/tests/cases/fourslash/moveToFile_undefined.ts
@@ -0,0 +1,15 @@
+/// <reference path="fourslash.ts" />
+
+// @module: esnext
+// @moduleResolution: bundler
+
+// @Filename: /orig.ts
+//// [|export const variable = undefined;|]
+
+verify.moveToFile({
+    newFileContents: {
+      "/orig.ts": "",
+      "/new.ts": "export const variable = undefined;\n"
+    },
+    interactiveRefactorArguments: { targetFile: "/new.ts" },
+});