Add .env SASS_PATH support

[PsiRadish]

Fixes #49

Adds support for resolving @imports in *.scss files using the paths defined in SASS_PATH in a .env file at the project root.

Works by reading in the .env file during initialization and adding its SASS_PATH value (after some fix-up to relative paths) to process.env.SASS_PATH, where dart-sass will find it and use it.

Unfortunately, like #50 the other currently pending pull request on this repo, I too have failing *.scss tests with empty received snapshot, even with no modifications from upstream origin/develop. All other tests are passing.

[mrmckeb]

Thanks @PsiRadish, this looks good - I'm just unsure as to if we should be using this - or instead just use the dotenv package?

I also think we might want to allow people to pass in a file name as an option. What do you think?

[mrmckeb]

@PsiRadish Can we make a change to this PR to try to load that file with dotenv?

[PsiRadish]

I also think we might want to allow people to pass in a file name as an option. What do you think?

I said the same in a MAYBE TODO in comments, so yeah, sounds good.

@PsiRadish Can we make a change to this PR to try to load that file with dotenv?

That is how I had it work in my first commit. However, I wasn't sure there weren't other environment variables typescript-plugin-css-modules or its dependencies used that one would not want set with values from a "random" React project .env file. If you are sure (or at least surer than I), then yeah, why not?

[mrmckeb]

Thanks for this work! I'll make some changes, and then release tomorrow.

[mrmckeb]

Hi @PsiRadish, we've just released v2.0.0 which includes this PR and other changes.

Release notes and migration steps can be found here: https://github.com/mrmckeb/typescript-plugin-css-modules/releases/tag/v2.0.0

Please let me know if you have any other issues or feedback! And thanks for your patience.