Add INIT_CWD environment variable when npm run scripts

[MichaelQQ]

As the issue #12164 mentioned, npm run scripts sets the cwd to the project root path.
When we need to run scripts in subdir, we should use the script like "cd subdir && babel src -d lib"

In some cases, we want to use the same script in different subdir, so we should add different scripts like:
"cd subdir1 && babel src -d lib", "cd subdir2 && babel src -d lib", etc.

Therefore, I add a INIT_CWD environment variable, which is add when npm run script. In the same situation, we can have only one script "cd $INIT_CWD && babel src -d lib" or "babel $INIT_CWD/src -d $INIT_CWD/lib". Type npm run script in the subdir which I want to do it and all subdir can run the same script.

[iarna]

We're not opposed to this on principle. The change should go in lib/utils/lifecycle.js however. (See where it sets env.npm_lifecycle_event, as that seems like the right place for this sort of thing).

This will also need tests and documentation before it can land.

[iarna]

I would stay w/ the original env var (all caps), but that's the right place, thank you. Now we just need a test and a patch to documentation so folks know that this is available. =)

[MichaelQQ]

I've added the test and rename it back to INIT_CWD.

[skiano]

Is this still being considered? I am not sure I understand why the integration tests failed.

[MichaelQQ]

Just rebase to npm:latest

[skiano]

Thanks! Any idea if/when it will make it to the main branch?

[iarna]

@skiano It still needs tests and docs.

@MichaelQQ You said "I've added the test" but I don't see any tests in your PR? We also need documentation for this feature.

[MichaelQQ]

I forgot to push the test 😅
I've added the documentation for INIT_CWD. Please check it. Thank you. 🙇

[iarna]

Looks great, thank you! I've landed this as 20c4622 in release-next with a bit of a rewrite to the documentation. It'll be out in a week or two in our next npm release.