Different jest.jestCommandLine settings for run vs debug

[nbolton]

Feature request

I'm using fnm on Linux to select my node version, and I've managed to set jest.jestCommandLine in settings.json to use the correct Node version according to the .nvmrc in my project:

  "jest.jestCommandLine": "fnm use --version-file-strategy recursive && npm test --",

This works fine for running tests normally (in the Jest 'Testing' activity), and from using 'Run test'.

However, when I use the 'Debug test' shortcut, e.g. to debug a specific test, it uses jest.jestCommandLine in a weird way; it prepends the full path of my system default Node binary (which is not the binary used for my project; that's an older Node version), so I get something like this:

/run/user/1000/fnm_multishells/1082892_1697542670710/bin/node ./fnm use --version-file-strategy recursive \&\& npm test --

This of course gives me a Cannot find module error, since fnm isn't something Node can run.

In this case, it'd be useful if we could use a different jest.jestCommandLine value for run and debug, since the value is used differently in each context.

The relevant line seems to be:

vscode-jest/src/JestExt/core.ts

Line 636 in 10414ab

if (this.extContext.settings.jestCommandLine) {

Workaround

For now, I'll just use fnm default x to set the Node version globally.

[connectdotz]

In debug, vscode uses its own configuration in the launch.json. We attempt to generate a debug config based on the jest.jestCommandLine if none is provided by users. This is a best effort and most likely won't cover all use cases. If it doesn't work for your project, it is recommended to create an explicit debug config instead: see https://github.com/jest-community/vscode-jest#debug-config-v2 (note the debug config has no dependency on jest.jestCommandLine)

[mion-kr]

same issue

[connectdotz]

For those who landed here, the solution is to create a custom debug configuration. See Debug Config for more details. You can start by copying one of the examples in the Debug Config v2 section and adjust it with your desired custom command line.

I will close this issue as this is the intended behavior. If you encounter any problems while setting up the custom debug configuration, please open a new issue with your specific use case so we can assist you further.

[dwiyatci]

(note the debug config has no dependency on jest.jestCommandLine)

The enlightenment that I've got the most is coming from this line above ☝