old_contents: 'use strict';
  
  class HalTransformer {
    * transform (str) {
      console.log('str', str);
  
      return str;
    }
  }
  
  module.exports = HalTransformer;
  
new_contents: 'use strict';
  
  class HalTransformer {
    * transform (str) {
      console.log('str', str);
      return str;
    }
  }
  
  module.exports = HalTransformer;
  
subject: Revert "fix(test): Test build"