A practical guide to building an ErrorFeedback JavaScript class that catches unhandled errors and promise rejections, then displays them in a dismissible banner. The class uses window.onerror and window.onunhandledrejection to intercept errors, shows a configurable message banner that auto-dismisses after 5 seconds, and can be extended to integrate with error monitoring services like Appsignal or Honeybadger. Aimed at Rails developers using Hotwire/Stimulus who want to improve UX when JavaScript fails silently.
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