Prettier : Prettier is an opinionated code formatter. It enforces a consistent style by parsing your code and re-printing it with its own rules that take the max...
RegPack : RegPack is a packer intended for use on minified Javascript code.
It is mostly suited to small size constraints (1kb, up to 4kb).
grunt : Grunt is a task-based command line build tool for JavaScript projects
Flow : Adds static typing to JavaScript to improve developer productivity and code quality.