Auto Attach is possible?

[andresgutgon]

Problem Statement

Hi, I've been configuring my nvim to debug on my editor a next.js app. And it works by starting a dev server with node options for debugging like this:

NODE_OPTIONS='--inspect' pnpm dev

But I was wondering if it's possible to launch a next server from nvim like VSCode does.
This is my launch.json in VSCode

{
  "version": "0.2.0",
  "configurations": [
    {
      "name": "Next.js: (node-terminal)",
      "type": "node-terminal",
      "request": "launch",
      "command": "pnpm dev"
    }
  ]
}

This starts the server inside VSCode and the debugger is up and running

So you this would be possible use nvim-dap?

Thanks for this awesome project!

Possible Solutions

No idea.

Considered Alternatives

The alternative is to use NODE_OPTIONS in a terminal and then attach to that next server. Is fine but it would be awesome to be able to launch the server and attach within nvim.

[mfussenegger]

It looks like vscode-js-debug has client-side code that takes care of handling the command property:

https://github.com/microsoft/vscode-js-debug/blob/7fe038e4bb338f0dd2b9362a1265b1efa9b20cfc/src/targets/node/terminalNodeLauncher.ts#L145-L150

If I read that right, it won't work out of the box with nvim-dap, and is also out of scope. I suspect it could be implemented in a way in the debug-adapter that works with a regular DAP client, without the need for custom extensions, but that would need to change in vscode-js-debug. Maybe worth creating an issue in their repository.

That said, the customization & extension points of nvim-dap should be powerful enough to also implement it on the client side.

E.g. you could try using the enrich_config routine of a :h dap-adapter to spawn the command, and rewrite the configuration to attach.

This might be something to implement in https://github.com/mxsdev/nvim-dap-vscode-js

[andresgutgon]

Thanks for the response @mfussenegger! I'll port the issue to the nvim-vscode-js repo