flamegraph does not work on Windows

[abyrd-phx]

morgue flamegraph myproj --filter "application,equal,FooServer" -o out.svg

C:\Users\abyrd\AppData\Roaming\npm\node_modules\backtrace-morgue\node_modules\backtrace-node\lib\backtraceClient.js:270
            throw e;
            ^

Error: spawn UNKNOWN
    at ChildProcess.spawn (node:internal/child_process:421:11)
    at spawn (node:child_process:761:9)
    at C:\Users\abyrd\AppData\Roaming\npm\node_modules\backtrace-morgue\bin\morgue.js:5338:17
    at onResponse (C:\Users\abyrd\AppData\Roaming\npm\node_modules\backtrace-morgue\lib\coroner.js:108:5)
    at Request._callback (C:\Users\abyrd\AppData\Roaming\npm\node_modules\backtrace-morgue\lib\coroner.js:391:12)
    at self.callback (C:\Users\abyrd\AppData\Roaming\npm\node_modules\backtrace-morgue\node_modules\request\request.js:185:22) 
    at Request.emit (node:events:519:28)
    at Request.<anonymous> (C:\Users\abyrd\AppData\Roaming\npm\node_modules\backtrace-morgue\node_modules\request\request.js:1154:10)
    at Request.emit (node:events:519:28)
    at IncomingMessage.<anonymous> (C:\Users\abyrd\AppData\Roaming\npm\node_modules\backtrace-morgue\node_modules\request\request.js:1076:12) {
  errno: -4094,
  code: 'UNKNOWN',
  syscall: 'spawn'
}

Node.js v21.7.1

I believe this comes from assuming the pl file itself is executable, but shebang doesn't work on Windows.

backtrace-morgue/assets/flamegraph.pl

Line 1 in c7220fa

#!/usr/bin/perl -w

spawn can call the appropriate executable with the script as an argument. This appears to work, but I don't know if enough about this ecosystem to know whether it's the right thing to do.
var child = spawn('node', [flamegraph]);

At least, it doesn't crash, but I end up with an empty svg. I can confirm the script is executing, the correct data is being returned, and it's being output to child.stdin. The problem appears to be here. The file is successfully created, but the pipe call doesn't end up outputting anything to it. I imagine this is because the child process is now node running a script, rather than the perl instance itself.

backtrace-morgue/bin/morgue.js

Line 5398 in c7220fa

child.stdout.pipe(stream);