In current Insiders (and presumably the upcoming release), spawning a .bat file on Windows without shell: true fails due to a breaking change in NodeJS:

https://nodejs.org/en/blog/vulnerability/april-2024-security-releases-2

It is important to note that there has been a breaking change for Windows users who utilize child_process.spawn and child_process.spawnSync. Node.js will now error with EINVAL if a .bat or .cmd file is passed to child_process.spawn and child_process.spawnSync without the shell option set.

It appears that there's no way to signal this to DebugAdapterExecutable and therefore any .bat-based debug adapters launched this way fail in current Insiders (and will presumably fail in stable soon).

Could shell: bool? be added to DebugAdapterExecutableOptions? I don't know enough to contribute this, but this seems quite important.