code: function sassVars (filePath) {
      const declarations = collectDeclarations(filePath);
      let variables = {};
  
      if (!declarations.length) {
          message('Warning: Zero declarations found');
          return;
      }
  
      declarations.forEach(function (declaration) {
          const parsedDeclaration = parseDeclaration(declaration);
          const varName = parsedDeclaration.key;
          let varValue = parsedDeclaration.value;
          const valueType = getValueType(varValue);
  
          /*
           * $key: $value;
           */
          if (valueType === 'var') {
              const localVarName = varValue;
              varValue = getVarValue(localVarName, variables);
  
              if (!varValue) {
                  message(`Warning: Null value for variable ${localVarName}`);
              }
          }
  
          /*
           * $key: ($value-1 + $value-2) * $value-3 ... ;
           */
          if (valueType === 'expression') {
              // todo
          }
  
          /*
           * $key: value;
           */
          variables[varName] = varValue;
      });
  
      return variables;
  }
docs: Takes file.scss as an argument
  Returns parsed variables hash-map
  @param filePath
  @returns {{}}