frida-fs createReadStream: on('end') is never called

[jpstotz]

I use the frida-agent-example project using the following code as agent/index.ts:

import { createReadStream } from "fs";

function readFile() {
    const filename = "/Applications/MobileSafari.app/MobileSafari";
    console.log("reading " + filename);
    const stream = createReadStream(filename);
    stream.on('data', (chunk : ArrayBuffer) => {
      console.log("data length: " + chunk.byteLength);
    })
    .on('end', () => {
      console.log("FINISHED");
    })
    .on('error', () => {
      console.log("ERROR");
    });
}

readFile();

> npm run build
> frida -U springboard -l _agent.js
     ____
    / _  |   Frida 16.0.10 - A world-class dynamic instrumentation toolkit
   | (_| |
    > _  |   Commands:
   /_/ |_|       help      -> Displays the help system
   . . . .       object?   -> Display information about 'object'
   . . . .       exit/quit -> Exit
   . . . .
   . . . .   More info at https://frida.re/docs/home/
   . . . .
   . . . .   Connected to Apple iPhone (id=XXXXX)
Attaching...
reading /Applications/MobileSafari.app/MobileSafari
[Apple iPhone::springboard ]-> data length: 2766864
[Apple iPhone::springboard ]->
[Apple iPhone::springboard ]-> exit

As you can see on('end') and thus console.log("FINISHED") is never called.
Another problem is that if you execute exit in frida nothing happens. Frida continues to run.

frida-server on the device is also v16.0.10 from Frida Cydia repository.
The used phone is an iPhone XR running iOS 14.2 with Unc0ver jailbreak