fix(fs): instanceof check for Deno.FsFile (#22121)

Regression caused by https://github.com/denoland/deno/pull/22072.

I added a relevant test so we don't regress again.

Fixes https://github.com/denoland/deno/issues/22115

1 files changed, 1 insertions, 1 deletions

diff --git a/ext/node/polyfills/_fs/_fs_readFile.ts b/ext/node/polyfills/_fs/_fs_readFile.ts
index de1a2a30d..0f05ee167 100644
--- a/ext/node/polyfills/_fs/_fs_readFile.ts
+++ b/ext/node/polyfills/_fs/_fs_readFile.ts
@@ -73,7 +73,7 @@ export function readFile(
 
   let p: Promise<Uint8Array>;
   if (path instanceof FileHandle) {
-    const fsFile = new FsFile(path.fd);
+    const fsFile = new FsFile(path.fd, Symbol.for("Deno.internal.FsFile"));
     p = readAll(fsFile);
   } else {
     p = Deno.readFile(path);