The core idea

Introduce Nodejs as base dependency to simplify current workflow.

The problem

• Upgrade toolchain like eslint cumbersome.
• Cpp format is really painful.
  When I work on src: refactor to nullptr #25888. I am pretty painful. With @joyeecheung awesome's work, we have clang-format also with make-formatc-cpp. But it's only available on unix-like os. And we have not clang-format the whole repo. I ended up copy the related snippet.
• Lint fix
  Node community is more familiar with nodejs tools like npm or yarn instead of bash or bat file.
• Use more community tools
  We may need to introduce more tools to improve develop efficiency like prettier and husky.

How do we achieve this

• create package.json in project root and add nodejs in prerequesite.md
• move eslint and other packages to pacakge.json, remove the sources.
• introduce husky and lint-staged, and add clang-format to the hooks. We can see it in electron and repo like CRA see https://github.com/facebook/create-react-app/blob/master/package.json and https://github.com/electron/electron/blob/master/package.json.
  Also we should agree on .clang-format rules and format the src and test folder commit to the repo.

Update on 2019-02-07:

• Not use related toolchain in build phase
• Not introduce husky and lint-staged for now, see Improve current workflow #25908 (comment)
• Not clang-format the whole repo, see [Internal] clang-format the whole repo #25955 (comment)

Update on 2019-02-12

• There are other reason I don't like copy all eslint and babel-eslint and all its dependency code to this repo. It's just a tool. Also with this review eslint upgrade will be much easier.
• Also I think we have same lint logic in both Makefile and vcbuild.bat. Unify it in package.json will remove redundant code.