Polyfills the ResizeObserver API and supports box size options from the latest spec
Monitor if a component is inside the viewport, using IntersectionObserver API
Resize observer for React
WebSocket framework for Ruby on Rails.
React MutateObserver Component
A React hook that allows you to use a ResizeObserver to measure an element's size.
Reactive primitives for observing resizing of HTML elements.
Rails UJS for the react-rails gem
A polyfill for the Resize Observer API
Resize observer for React
A React hook for the IntersectionObserver API that uses a polyfill when the native API is not available
Use webpack to manage app-like JavaScript modules in Rails
A React hook that fires a callback whenever ResizeObserver detects a change to its size
Unobtrusive scripting adapter for jQuery
Detect if web fonts are available
bootstrap-sass is a Sass-powered version of Bootstrap 3, ready to drop right into your Sass powered applications.
🏯 PositionObserver is a JavaScript tool that provides a way to asynchronously observe changes in the position of a target element within its viewport.
react-on-rails JavaScript for react_on_rails Ruby gem
Tracks the intersection of a DOM element and its containing element or the viewport.
A tiny Fetch API wrapper that allows you to make http requests without need to handle to send the CSRF Token on every request
An implementation and polyfill of the Resize Observer draft.
Observe CSS property changes on any elements
Convention over configuration for using Vite in Rails apps
A React Hooks package for mutation-observer
A rails asset gem for dry-observer
E11y (Easy Telemetry) - Observability for Rails developers who hate noise. UNIQUE FEATURES: • Request-scoped debug buffering - buffers debug logs in memory, flushes ONLY on errors • Zero-config SLO tracking - automatic Service Level Objectives for HTTP endpoints and jobs • Schema-validated events - catch bugs before production with dry-schema DEVELOPER EXPERIENCE: • Minimal setup — one config block, works with stdout out of the box • Auto-metrics from events (no manual Yabeda.increment) • Rails-first design (follows Rails conventions) • Pluggable adapters (Loki, Sentry, OpenTelemetry, custom backends) COST SAVINGS: • Reduce log storage costs by 90% (request-scoped buffering) • Replace expensive APM SaaS ($500-5k/month → infra costs only) • Own your observability data (no vendor lock-in) PRODUCTION-READY: • Thread-safe for multi-threaded Rails + Sidekiq • Adaptive sampling (error-based, load-based, value-based) • PII filtering (GDPR-compliant masking/hashing) • Performance optimized (hash-based events, minimal allocations) Perfect for Rails 7.0+ teams who need observability without complexity or high costs.