Sourcemap & front matter support for css files

[julientaq]

Thanks to all the folks participating on #1. Pretty helpful.

• update test to eleventy 3.0 beta
• add source map
• add front matter support for css (frontmatter is removed in the asyncBundle).

[julientaq]

This update only works with elventy 3.0

So Eleventy 2.0 does have the data.page.outputPath but it has a bug with front matter in the css file.

The simplest way to support 2.0 would be to add an option.cssoutputfolder.

This way we could put the sourcemap where it needs to be.

But since the cost to move from eleventy 2 to 3 seems quite low, i’m not sure it’s a good idea.

I spent some time looking at it and we’d need to test for the version of eleventy to provide 2 rules.

Maybe the best way would be to provide an legacy plugin for eleventy to 2.0.1 and a modern for eleventy 3 and onward.