Load multiline env var from external file for debugger failed in fish shell

[Teo-ShaoWei]

Does this issue occur when all extensions are disabled?: Yes

• VS Code Version: 1.88.1
• OS Version: macOS Sonoma 14.4.1 (23E224)

https://code.visualstudio.com/docs/nodejs/nodejs-debugging#_load-environment-variables-from-external-file

Steps to Reproduce

Install fish shell and have it working with VS Code. Go to user settings, change "Terminal > Integrated > Default Profile: Osx" to an installed fish shell.

Follow Load environment variables from external file and set up a .env file with a single multiline env var MYENV="foo\nbar".

Create an app.js with console.log(process.env) (not essential to reproduce the bug, just to demonstrate the correct behaviour).

Create the following launch.json configuration:

{
  "version": "0.2.0",
  "configurations": [
    {
      "name": "test",
      "type": "node",
      "request": "launch",
      "args": [],
      "cwd": "${workspaceFolder}",
      "program": "${workspaceFolder}/app.js",
      "console": "integratedTerminal",
      "envFile": "${workspaceFolder}/.env",
    },
  ],
}

Expected

The console will log env vars with MYENV shown to be correctly ingested. For example, when using zsh, the correct single command is run till completion:

> cd <<project_folder>> ; /usr/bin/env 'lines=foo
quote> bar' 'NODE_OPTIONS= --require "/Applications/Visual Studio Code.app/Contents/Resources/app/extensions/ms-vscode.js-debug/src/bootloader.js"  --inspect-publish-uid=http' 'VSCODE_INSPECTOR
_OPTIONS=:::{"inspectorIpc":"/var/folders/x3/_z626cj108sdszn1f9bs8b1m0000gn/T/node-cdp.43848-5e183c87-146.sock","deferredMode":false,"waitForDebugger":"","execPath":"/Users/shaowei/.nvm/version
s/node/v20.10.0/bin/node","onlyEntrypoint":false,"autoAttachMode":"always","fileCallback":"/var/folders/x3/_z626cj108sdszn1f9bs8b1m0000gn/T/node-debug-callback-576db9a978f1245e"}' /Users/shaowe
i/.nvm/versions/node/v20.10.0/bin/node ./app.js


Debugger attached.
<<env vars printed below>>
{
  ...
  MYENV: 'foo\nbar',
  ...
}
Waiting for the debugger to disconnect...

Actual

The debugger hanged as the \n causes fish shell to run it as 2 separate commands instead. For example the following:

> /usr/bin/env 'lines=foo' 

> bar' 'NODE_OPTIONS= --require "/Applications/Visual Studio Code.app/Contents/Resources/app/extensions/ms-vscode.js-debug/src/bootloader.js"  --inspect-publish-uid=http' 'VSCODE_INSPECTOR_OPT
IONS=:::{"inspectorIpc":"/var/folders/x3/_z626cj108sdszn1f9bs8b1m0000gn/T/node-cdp.43848-03d5fa0a-141.sock","deferredMode":false,"waitForDebugger":"","execPath":"/Users/shaowei/.nvm/versions/no
de/v20.10.0/bin/node","onlyEntrypoint":false,"autoAttachMode":"always","fileCallback":"/var/folders/x3/_z626cj108sdszn1f9bs8b1m0000gn/T/node-debug-callback-7fa737160ba19e11"}' /Users/shaowei/.n
vm/versions/node/v20.10.0/bin/node ./app.js