Support source maps for scss in dev environments #8638
                
     Merged
            
            
          
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This should resolve #5707. A basic history of that issue as I understand it: currently, create-react-app doesn't have sourcemaps for scss on development environments. This feature was briefly added two years ago in #5713, then reverted due to a bug in an upstream dependency. The upstream bug is now fixed, so we can (I believe) re-enable this feature.