Unable to build the site due to SCSS error. about jekyll-serif-theme HOT 6 CLOSED

Getting a similar issue except mine deploys

`Deprecation Warning: Using / for division outside of calc() is deprecated and will be removed in Dart Sass 2.0.0.

Recommendation: math.div($spacer, 2) or calc($spacer / 2)

More info and automated migrator: https://sass-lang.com/d/slash-div

╷

302 │ $headings-margin-bottom: $spacer / 2 !default;
│ ^^^^^^^^^^^
╵
/home/thinkpad/jekyll-serif-theme-master/_sass/bootstrap/_variables.scss 302:31 @import
bootstrap/bootstrap-reboot.scss 10:9 @import
/home/thinkpad/jekyll-serif-theme-master/assets/css/style.scss 28:9 root stylesheet
Deprecation Warning: Using / for division outside of calc() is deprecated and will be removed in Dart Sass 2.0.0.

Recommendation: math.div($input-padding-y, 2) or calc($input-padding-y / 2)

More info and automated migrator: https://sass-lang.com/d/slash-div

╷

498 │ $input-height-inner-quarter: add($input-line-height * .25em, $input-padding-y / 2) !default;
│ ^^^^^^^^^^^^^^^^^^^^
╵
/home/thinkpad/jekyll-serif-theme-master/_sass/bootstrap/_variables.scss 498:73 @import
bootstrap/bootstrap-reboot.scss 10:9 @import
/home/thinkpad/jekyll-serif-theme-master/assets/css/style.scss 28:9 root stylesheet
Deprecation Warning: Using / for division outside of calc() is deprecated and will be removed in Dart Sass 2.0.0.

Recommendation: math.div($custom-control-indicator-size, 2) or calc($custom-control-indicator-size / 2)

More info and automated migrator: https://sass-lang.com/d/slash-div

╷

568 │ $custom-switch-indicator-border-radius: $custom-control-indicator-size / 2 !default;
│ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
╵
/home/thinkpad/jekyll-serif-theme-master/_sass/bootstrap/_variables.scss 568:49 @import
bootstrap/bootstrap-reboot.scss 10:9 @import
/home/thinkpad/jekyll-serif-theme-master/assets/css/style.scss 28:9 root stylesheet
Deprecation Warning: Using / for division outside of calc() is deprecated and will be removed in Dart Sass 2.0.0.

Recommendation: math.div($spacer, 2) or calc($spacer / 2)

More info and automated migrator: https://sass-lang.com/d/slash-div

╷

713 │ $nav-divider-margin-y: $spacer / 2 !default;
│ ^^^^^^^^^^^
╵
/home/thinkpad/jekyll-serif-theme-master/_sass/bootstrap/_variables.scss 713:37 @import
bootstrap/bootstrap-reboot.scss 10:9 @import
/home/thinkpad/jekyll-serif-theme-master/assets/css/style.scss 28:9 root stylesheet
Deprecation Warning: Using / for division outside of calc() is deprecated and will be removed in Dart Sass 2.0.0.

Recommendation: math.div($spacer, 2) or calc($spacer / 2)

More info and automated migrator: https://sass-lang.com/d/slash-div

╷

718 │ $navbar-padding-y: $spacer / 2 !default;
│ ^^^^^^^^^^^
╵
/home/thinkpad/jekyll-serif-theme-master/_sass/bootstrap/_variables.scss 718:37 @import
bootstrap/bootstrap-reboot.scss 10:9 @import
/home/thinkpad/jekyll-serif-theme-master/assets/css/style.scss 28:9 root stylesheet
Warning: 22 repetitive deprecation warnings omitted.
Run in verbose mode to see all warnings.
`

from jekyll-serif-theme.

I had those warnings as well, but the site was built.

Yet, one can solve it runing:

$ npm install -g sass-migrator
$ sass-migrator division ./_sass/*.scss

at the jekyll site base directory. Now I can build without warnings.

It seems the deprecated files are from bootstrap/vendor/, so maybe another solution would be to update the bootstrap library (but I have not tried that).

More info about this at: https://sass-lang.com/documentation/breaking-changes/slash-div/

from jekyll-serif-theme.