Flow : Adds static typing to JavaScript to improve developer productivity and code quality.
pkg : This command line interface enables you to package your Node.js project into an executable that can be run even on devices without Node.js installed.
ESLint : The pluggable linting utility for JavaScript and JSX
Expo : Expo is a framework and a platform for universal React applications. It is a set of tools and services built around React Native and native platforms ...
A toolkit for React, Preact & Inferno apps, React libraries and other npm modules for the web, with no configuration (until you need it)