Is there a FileHandle class

[lil5]

• Node.js Version: v16.8.0
• OS: Linux mint 20.2
• Scope (install, code, runtime, meta, other?): Typescript definitions and Documentation
• Module (and version) (if relevant): n/a

I am trying to create a test to see if a variable contains a fs.FileHandle.

import fs, { promises as fsp } from "fs"

const f = await fsp.open(fpath, "a+")
expect(f).toBeInstanceOf(fs.FileHandle)

Problem
I can't see to find the class FileHandle, neither in fs nor fs.promises.

https://nodejs.org/api/fs.html#fs_class_filehandle
This documentation states that FileHandle is a class.

I have found the FileHandle interface in fs.promises but I'm interested in using instanceof <class>.

Question
Is there a FileHandle class and where is it?

[Mesteery]

The FileHandle class isn't exported. Is there a reason to access it?

[lil5]

@Mesteery For my use case it is handy to beable use instanceof in tests

My code example should explain it.

[Mesteery]

You can get the constructor, and therefore FileHandle, but it's useless, since instanceof will always be true:

const fh = await fsp.open(...);
fh instanceof fh.constructor /* FileHandle */;

(that's why I wonder about the reason to access it)

[lil5]

Yeah that works but for unit tests is useless.

Indeed there are better tests to write, but with large functions it is good to be able to test is a value is what it says it is.
For now I will keep to using a test that expects what it is not.