`for await (const c of process.stdin)` does not accept EOF in Windows

Why this is a good first issue

Platform-specific EOF handling in Windows requires careful implementation.

AI Summary

The issue involves inconsistent EOF handling in Windows when using `for await` with `process.stdin`, where Ctrl+Z or Ctrl+D does not terminate the input loop as expected. The fix likely requires modifying stream handling logic to properly detect EOF signals on Windows, but platform-specific behavior adds complexity.

Issue Description

Version

v24.13.0

Platform

Microsoft Windows NT 10.0.26200.0 x64

Subsystem

No response

What steps will reproduce the bug?

Run node -e "for await (const c of process.stdin) console.log(c)"
[f] [o] [o] [Enter]
[Ctrl] + [Z] or [Ctrl] + [D] (= EOF)
[Enter]

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

Always

What is the expected behavior? Why is that the expected behavior?

In Ubuntu and Alma Node successfully stop reading by Ctrl + D:

$ node -e "for await (const c of process.stdin) console.log(c)"
foo
<Buffer 66 6f 6f 0a>

What do you see instead?

Node will never stop reading in spite of [Ctrl] + [Z] or [Ctrl] + [D]:

PS> node -e "for await (const c of process.stdin) console.log(c)"
foo
<Buffer 66 6f 6f 0d 0a>
^Z
<Buffer 1a 0d 0a>
^D
<Buffer 04 0d 0a>

I had to end up with killing the process by Ctrl + C.

Additional information

I usually use Proto to manage Node versions, but it was able to be reproduced in the portable version in the official zipball:

PS> .\Downloads\node-v24.13.0-win-x64\node -e "for await (const c of process.stdin) console.log(c)"
foo
<Buffer 66 6f 6f 0d 0a>
^Z
<Buffer 1a 0d 0a>
^D
<Buffer 04 0d 0a>

PS> echo $?
False

(ended up with Ctrl + C)

Workaround: insert if ((c[0] === 4 || c[0] === 0x1a) && c.length === 1 + EOL.length && c.toString("latin1", c.length - EOL.length) === EOL) break; (import { EOL } from "node:os")

If this bug did not exist, you would be able to retrieve the entire multiline text from stdin by (await Array.fromAsync(process.stdin)).join("") in all platforms.