TS2Swift tests: warn on export assignment

Author: kateinoigakukun

Plugins/BridgeJS/Sources/TS2Swift/JavaScript/test/__snapshots__/ts2swift.test.js.snap

@@ -121,6 +121,19 @@ exports[`ts2swift > snapshots Swift output for Documentation.d.ts > Documentatio
 "
 `;
 
+exports[`ts2swift > snapshots Swift output for ExportAssignment.d.ts > ExportAssignment 1`] = `
+"// NOTICE: This is auto-generated code by BridgeJS from JavaScriptKit,
+// DO NOT EDIT.
+//
+// To update this file, just rebuild your project or run
+// \`swift package bridge-js\`.
+
+@_spi(BridgeJS) import JavaScriptKit
+
+@JSGetter var foo: Double
+"
+`;
+
 exports[`ts2swift > snapshots Swift output for Interface.d.ts > Interface 1`] = `
 "// NOTICE: This is auto-generated code by BridgeJS from JavaScriptKit,
 // DO NOT EDIT.

Plugins/BridgeJS/Sources/TS2Swift/JavaScript/test/fixtures/ExportAssignment.d.ts

@@ -0,0 +1,2 @@
+export const foo: number;
+export default foo;

Plugins/BridgeJS/Sources/TS2Swift/JavaScript/test/ts2swift.test.js

@@ -1,5 +1,5 @@
 // @ts-check
-import { describe, it, expect } from 'vitest';
+import { describe, it, expect, vi } from 'vitest';
 import { readdirSync, mkdtempSync, writeFileSync, rmSync } from 'fs';
 import { fileURLToPath } from 'url';
 import path from 'path';
@@ -50,4 +50,19 @@ describe('ts2swift', () => {
             rmSync(tmpDir, { recursive: true, force: true });
         }
     });
+
+    it('emits a warning when export assignments cannot be generated', () => {
+        const dtsPath = path.join(inputsDir, 'ExportAssignment.d.ts');
+        const stderrSpy = vi.spyOn(process.stderr, 'write').mockImplementation(() => true);
+        try {
+            run([dtsPath], { tsconfigPath, logLevel: 'warning' });
+            const combined = stderrSpy.mock.calls.map(args => String(args[0])).join('');
+            expect(combined).toMatch(/Skipping export assignment/);
+            // Only warn once for the export assignment node
+            const occurrences = (combined.match(/Skipping export assignment/g) || []).length;
+            expect(occurrences).toBe(1);
+        } finally {
+            stderrSpy.mockRestore();
+        }
+    });
 });