Ensure we are getting FileEntry type (#2980)

* ensure we did not get a directory

* changeset

* add comment

---------

Co-authored-by: Vieltojarvi <[email protected]>

Author: ShadowCat567

.changeset/khaki-lizards-knock.md

@@ -0,0 +1,2 @@
+---
+---

packages/integration-tests/src/test-project-setup/advanced_auth_and_functions.ts

@@ -211,6 +211,7 @@ class AdvancedAuthAndFunctionsTestProject extends TestProjectBase {
     const entries = await zipReader.getEntries();
     const entry = entries.find((entry) => entry.filename.endsWith('index.mjs'));
     assert(entry !== undefined);
+    assert(entry.directory === false); // we are expecting to get a file
     const sourceCode = await entry.getData!(new TextWriter());
     assert(sourceCode.includes(expectedCode));
   };