TIL-Lab49/There are all kinds of useful environment variables set by npm.

variables.md

npm will set all kinds of useful environment variables for you. To see what gets set, add the following to your package.json:

{
  "scripts": {
    "check-env": "node -e 'console.log(process.env)' | grep npm"
  }
}

...and then run $ npm run check-env.

Lots of information about your dependencies, configuration, node and npm versions, and, interestingly npm_package_gitHead, which is the SHA of the current git HEAD.