Issue with ms-animation mixin with Sass (latest version of DartSass)

[valentintudor]

There is an error with the ms-animation mixin from _Animation.Mixins.MDL2.scss which is also a deprecated file (imported in _Animation.Mixins.scss) and imported from _References.scss.

ModuleBuildError: Module build failed (from ./node_modules/sass-loader/dist/cjs.js):
SassError: $string: ms-fadeIn is not a string.

177 │ $namelist: append($namelist, unquote($newname), 'comma');

Some people recommend to use the latest node-sass version, but this is deprecated, since the dart-sass implementation of Sass with Dart language is now preferred. This would not be an option.

Please fix this issue, you can't build a Webpack project from Fluent UI Sass sources because of this small issue. These are deprecated stuff which should be removed in a future version, but currently it's blocking and you are required to use the CSS directly. I know this is a well known issue lasting since last year, but currently not fixed.