code: func (p *Project) Clean() error {
  	p.Log.Debugf("cleaning %d functions", len(p.Functions))
  
  	for _, fn := range p.Functions {
  		if err := fn.Clean(); err != nil {
  			return fmt.Errorf("function %s: %s", fn.Name, err)
  		}
  	}
  
  	return nil
  }
docs: // Clean up function build artifacts.