Writing to sdtin crashes sketch

[chpio]

Hi,

i need to run code in nodejs. So my idea was to spawn a nodejs process and communicate with it by sending jsonl messages to stdin (you call it sdtin) & getting jsonl messages back from stdout.

But when i attempt to write to stdin it just crashes sketch. No crash reports in console.

const child = spawn(
	path.resolve(process.cwd(), "./Contents/Sketch/external"),
	[],
	{cwd: path.resolve(process.cwd(), "./Contents/Sketch")},
);

// @ts-ignore
const stdin: Writable = child.stdin || child.sdtin;

const buf = Buffer.from(JSON.stringify({type: "getImages"}) + "\n");
console.log("buf", buf);

await new Promise<void>((onOk, onErr) => {
	// crashes here
	stdin.write(buf, (err) => {
		if (err !== null && err !== undefined) {
			onErr(err);
		} else {
			onOk();
		}
	});
});

[mathieudutour]

happy to accept a PR to fix it (both the typo and the bug)

[chpio]

the typo is not a problem, but how to even debug the crash?

writeData is deprecated, but that shouldn't cause a crash (or is the underlying implementation using the non-deprecated function internally anyway?).

Are there any typescript declarations for the apple javascript types? Couldn't find any so far. (What's the name of that apple js runtime? Asking so that i can search for it)

[chpio]

There is (sometimes) a crash report created in console.

"libdispatch.dylib":["BUG IN CLIENT OF LIBDISPATCH: dispatch_sync called on queue already owned by current thread","Abort Cause 27022302138863365"]

Illegal instruction: 4

edit: i guess the panic is caused by the blocking write op, that would block the current queue, causing a deadlock?