Test setup broken with npm or latest pnpm version

[hpawe01]

At the moment it is not possible to contribute larger changes to this project because if I follow the installation steps in CONTRIBUTION.md I end up with a version where I cannot run the tests. npm test results in:

FAIL  src/extension.test.ts [ src/extension.test.ts ]
Error: Failed to load url vscode (resolved id: vscode) in C:/work/projects/vscode-npm-outdated/src/extension.test.ts. Does the file exist?

The following way works:

• Install pnpm but at version 7 (the latest version doesn't work as well): npm -g i pnpm@7
• Install packages with pnpm i (to make this work, I had to remove the node_modules folder that was created by the previous npm i)
• Run tests with npm test

I didn't looked deeper into the reasons why this way works - maybe pnpm v7 resolves the vscode imports another way?