code: function getExpressionValue (varName, scssExpression) {
      if (is.undef(scssExpression) || is.args.empty(arguments)) {
          message('Error: Missing arguments');
          return undefined;
      }
  
      if (!is.string(varName) || !is.string(scssExpression)) {
          message('Error: Check arguments type');
          return undefined;
      }
  
      if (!~scssExpression.indexOf('$')) {
          message('Warning: Check scssExpression to contain valid code')
      }
  
      // print the interpolated value in comment string
      // /*#{$varName}*/ --> /*varValue*/
      const scssContent = `${scssExpression}/*#{$${varName}}*/`;
  
      const sassResult = sass.renderSync({
          data: scssContent
      });
  
      const cssResult = sassResult.css.toString();
  
      return extractExpressionValue(cssResult);
  }
docs: Resolve variable value
  By variable name and previous code
  @param varName
  @param scssExpression