```ruby
module Modulr
  class SyncCollector < Collector
    def add_module_from_path(path)
      js_module = super(path)
      modules << js_module unless modules.include?(js_module)
    end
    
    private
      def lib
        File.read(PATH_TO_MODULR_SYNC_JS)
      end
    
      def requires
        top_level_modules.map { |m| "\n  require('#{m.id}');" }.join
      end

  end
end```

Make main module global when handling more than one file at the same time.
user
```ruby
module Modulr
  class SyncCollector < Collector
    def add_module_from_path(path)
      js_module = super(path)
      modules << js_module unless modules.include?(js_module)
    end
    
    private
      def lib
        output = File.read(PATH_TO_MODULR_SYNC_JS)
        if top_level_modules.size > 1
          output << "\nvar module = {};\n"
          output << "\nrequire.main = module;\n"
        end
        output
      end
      
      def requires
        top_level_modules.map { |m| "\n  require('#{m.id}');" }.join
      end

  end
end```
assistant