npm 모듈 생성하고, npmjs에 모듈 등록하는 방법.
# create folder
$ mkdir lemoncloud-js
$ cd lemoncloud-js
# initialize package.json
$ npm init
# edit README
$ echo "# lemoncloud-js" >> README.md
# npm login (register if not)
$ npm login
# publish
$ npm publish
참고: https://eladnava.com/publishing-your-first-package-to-npm/