setTimeout runs inconsistently

[klirix]

Version

0.1.2

Platform

Linux 5.10.102.1-microsoft-standard-WSL2 #1 SMP Wed Mar 2 00:30:59 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux

What steps will reproduce the bug?

Bun.serve({
  fetch(this, request) {
    const time = Date.now();
    setTimeout(() => {
      Bun.write(Bun.stdout, `Resolved in ${Date.now() - time} \n`);
    }, 1000);
    return new Response("OK");
  },
  port: 3005,
});

How often does it reproduce? Is there a required condition?

This example reproduces consistently

What is the expected behavior?

Resolved in 1000 
Resolved in 1000 
Resolved in 1000 
Resolved in 1000 
Resolved in 1000 

What do you see instead?

When requests are launched via scripts, or by hand in rapid succession

Resolved in 1001 
Resolved in 586 
Resolved in 66 
Resolved in 1000 
Resolved in 1001 

Additional information

In a more complex cases I noticed that setTimeouts may resolve instantly or not resolve at all, instead of set period of ms. If I manage to reduce the repro to manageable format I will add it in a comment. From what I noticed the issue only appears when setTimeout is used with Bun server

[Jarred-Sumner]

Duplicate of #490