@bugsnag/js
Universal Javascript error reporting. Automatically detect JavaScript errors in the browser and Node.js, with plugins for React, Vue, Angular, Express, Restify and Koa.
@vaadin/router
Small and powerful client-side router for Web Components. Framework-agnostic.
riot
Simple and elegant component-based UI library
html2pdf.js
Client-side HTML-to-PDF rendering using pure JS
cable_ready
CableReady helps you create great real-time user experiences by making it simple to trigger client-side DOM changes from server-side Ruby.