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...Callbacks make it easy to log errors to your own telemetry, show toasts, or trigger side effects when boundaries trip or reset. A companion useErrorHandler hook lets you re-throw async errors from hooks or event handlers into the nearest boundary, unifying error flows across component styles.
Crossbrowser & lightweight way to check if users are looking at a page
ifvisible.js is a lightweight way to check if a user is looking at the page or interacting with it. Check out the demo, read the code example, or check the annotated source.