isn't a valid CSS value - sass-loader can't parse font shorthand options that are 100% valid for css

[wzup]

Looks like sass-loader doesn't know how to parse this:

font: normal normal 400 16px/calc(16px * 1.4) Oxygen;

It is 100% valid value for css, but for some reason it is not valid for sass-loader.
It throws on 16px/calc(16px * 1.4) part:

ERROR in ./src/sass/globals.scss
    Module build failed: ModuleBuildError: Module build failed:
        font: normal normal 400 16px/calc(16px * 1.4) Oxygen;
                               ^
          16px/calc isn't a valid CSS value.
          in C:\Users\user\app\src\sass\globals.scss (line 15, column 29)
        at runLoaders (C:\Users\user\app\node_modules\webpack\lib\NormalModule.js:192:19)
        at C:\Users\user\app\node_modules\loader-runner\lib\LoaderRunner.js:364:11
        at C:\Users\user\app\node_modules\loader-runner\lib\LoaderRunner.js:230:18
        at context.callback (C:\Users\user\app\node_modules\loader-runner\lib\LoaderRunner.js:111:13)
        at Object.asyncSassJobQueue.push [as callback] (C:\Users\user\app\node_modules\sass-loader\lib\loader.js:57:13)
        at Object.<anonymous> (C:\Users\user\app\node_modules\async\dist\async.js:2243:31)
        at Object.callback (C:\Users\user\app\node_modules\async\dist\async.js:906:16)
        at options.error (C:\Users\user\app\node_modules\node-sass\lib\index.js:294:32)
     @ ./src/js/App.js 6:14-37
     @ ./src/js/router.js
     @ ./src/js/browser.js

How to solve it? Is there some special syntax for it? Quotes don't work.

[alexander-akait]

@wzup yep, it is valid css and it should be valid as scss (working on original sass compiler v4).
Problems in libsass (https://github.com/sass/libsass). We can not do anything here. Please create issue in libsass.

https://www.sassmeister.com/
Input:

a {
    font: normal normal 400 16px/calc(16px * 1.4) Roboto;
}

Output:

16px/calc isn't a valid CSS value. on line 2 at column 29

Thanks for helping us to do webpack better!

[alexander-akait]

Fixed: sass/libsass#2392, let's wait new version node-sass with new version libsass. Thanks!