Flow : Adds static typing to JavaScript to improve developer productivity and code quality.
tracing-framework : Rich tools for instrumenting, analyzing, and visualizing web apps.
grunt : Grunt is a task-based command line build tool for JavaScript projects
Ink : Ink provides the same component-based UI building experience that React offers in the browser, but for command-line apps. It uses Yoga to build Flexbo...
Lerna : A tool for managing JavaScript projects with multiple packages.
A toolkit for React, Preact & Inferno apps, React libraries and other npm modules for the web, with no configuration (until you need it)