@babel/standalone
https://github.com/babel/babel/tree/master/packages/babel-standaloneEventEmitter
https://nodejs.org/api/events.html#events_emitter_removelistener_eventname_listener
EventEmitterのテスト
gray-matter
https://github.com/jonschlinkert/gray-mattermdx
@mdx-js/tag: https://github.com/mdx-js/mdx/tree/master/packages/tag
@mdx-js/mdx: https://github.com/mdx-js/mdx/tree/master/packages/mdx
remark-react
https://github.com/mapbox/remark-reactremark-rehype
https://github.com/remarkjs/remark-rehypesection-matter
https://github.com/jonschlinkert/section-matterstyled-components
https://github.com/styled-componentsreact-starter
Debug: `yarn run react:starter`https://github.com/marionebl/commitlint
yarn add -D @commitlint/config-conventional @commitlint/cli husky pre-commit @commitlint/travis-cli
yarn add -D jest jest-cli ts-jest @types/jest