Deprecation warning with sass gem 3.5

[dpron]

• This is a question about using the theme.
• This is a feature request.
• I have updated all gems with bundle update.
• I have tested locally with bundle exec jekyll build.
• I believe this to be a bug with the theme --- not Jekyll, GitHub Pages or one of the bundled plugins.

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Environment informations

• Minimal Mistakes version: 4.4.2
• github-pages or jekyll gem version: (straight from forked source)
• Operating system: Mac 10.12.5

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Expected behavior

Site builds without warnings

Steps to reproduce the behavior

rm Gemfile.lock
bundle update

(updates saas gem to 3.5.1)

build site - causes screens full of the following warnings

DEPRECATION WARNING: Passing a string to call() is deprecated and will be illegal
in Sass 4.0. Use call(get-function("mixin-exists")) instead.

and

DEPRECATION WARNING: Passing a string to call() is deprecated and will be illegal
in Sass 4.0. Use call(get-function("variable-exists")) instead.

if I force the saas gem back to 3.4.25 - warnings disappear.

Unfortunately warnings don't reference the exact file names.

[mmistakes]

If I had to guess it's due to one of the 3rd party mixins I'm using (Breakpoint, Susy, etc.). I'll see if I can track down which Sass partial is the issue and see if they have updated their libraries to get around the warnings.

[mmistakes]

Investigate 3rd party Sass

• https://github.com/mmistakes/minimal-mistakes/tree/master/_sass/minimal-mistakes/vendor

[mmistakes]

Found the culprit, Susy 2's set of mixins.

These deprecation warnings are mostly harmless but figured I'd go ahead and upgrade to Susy 3 anyways. That project went through a fairly serious rewrite so I had to refactor a lot of the CSS I was using to build the theme's grid.

Everything looks good to me, but if anyone wants to test and verify I didn't break anything (specifically grid layouts in related posts, galleries, etc) give it a go.

To test you can replace the entire _sass folder with this one in the susy-3-upgrade branch. Or if you're using the theme gem replace gem "minimal-mistakes-jekyll" with this line:

gem "minimal-mistakes-jekyll", :git => "https://github.com/mmistakes/minimal-mistakes.git", :branch => "susy-3-upgrade"

[wkc1986]

Merged updates from susy-3-upgrade, seems to work well.

[mmistakes]

Great, thanks for confirming @wkc1986. I'll get this merged into the next release.

[justinrummel]

using the specific susy-3-upgrade branch eliminated the warnings for me too.