code: protected function getStubs(?string $table = null, bool $create = false): iterable
      {
          if (is_null($table)) {
              yield M::TYPE_UP => $this->stubs->read('blank.sql.stub');
              yield M::TYPE_DOWN => $this->stubs->read('blank.sql.stub');
              return;
          }
  
          $first = [M::TYPE_UP => 'create.sql.stub', M::TYPE_DOWN => 'down.sql.stub'];
          $second = [M::TYPE_UP => 'update.sql.stub', M::TYPE_DOWN => 'update.sql.stub'];
  
          $stubs = $create ? $first : $second;
  
          foreach ($stubs as $type => $stub) {
              yield $type => $this->stubs->read($stub);
          }
      }
docs: Get the migration stub file.
  
  @param  string $table
  @param  bool $create
  @return iterable
  @throws \League\Flysystem\FileNotFoundException