code: func (p *Plugin) Build(fn *function.Function, zip *archive.Zip) error {
  	if fn.Shim {
  		fn.Log.Debug("add shim")
  
  		if err := zip.AddBytes("index.js", shim.MustAsset("index.js")); err != nil {
  			return err
  		}
  
  		if err := zip.AddBytes("byline.js", shim.MustAsset("byline.js")); err != nil {
  			return err
  		}
  	}
  
  	return nil
  }
docs: // Build adds the nodejs shim files.