golang-standards/project-layout その中の記述には・・・ /pkg Library code that's ok to use by external applications (e.g., /pkg/mypubliclib). Other projects will import these libraries expecting them to work, so think twice before you put something here :-) 共通化できるファイルはpkg/配下に置けばいい(と判断) 5. ディレクトリ構成について少しだけ考えてみた!