fix: path not available in browser

app/utils/files.test.ts

@@ -0,0 +1,12 @@
+import { extname } from "./files";
+
+describe("#extname", () => {
+  test("should extract file extension from string", () => {
+    expect(extname("one.doc")).toBe(".doc");
+    expect(extname("one.test.ts")).toBe(".ts");
+    expect(extname(".DS_Store")).toBe("");
+    expect(extname("directory/one.pdf")).toBe(".pdf");
+    expect(extname("../relative/one.doc")).toBe(".doc");
+    expect(extname(".hidden/directory/one.txt")).toBe(".txt");
+  });
+});