Is it intended Nuxt 3 behavior that a watcher gets triggered when changing between tabs?
I have a simple watcher, like so:
And I noticed it gets triggered every time I switch between tabs (meaning: If I have my web app open on tab A, I click on tab B where I have YouTube open, and I switch back to tab A the watcher runs again).
Is this intended behavior? Why is this necessary?
2 Replies
Hi @Phillip. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:
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Based on the knowledge sources provided, there isn't specific information about watchers being triggered when switching between browser tabs in Nuxt 3. However, I can provide some relevant information about watchers and potential memory leak issues in Nuxt 3 that might be related to your observation.
The behavior you're describing doesn't seem to be an intended feature of Nuxt 3 or Vue 3 watchers. Typically, watchers are designed to react to changes in the watched value, not to browser tab switches.
However, there have been reports of memory leak issues in Nuxt 3 related to navigation and watchers. For example, in the Github Issue (closed): Memory Leak on route navigation, users reported memory increases when switching between tabs within the Nuxt application. While this isn't exactly the same as your situation with browser tabs, it suggests that there might be some unintended behavior with watchers and navigation in Nuxt 3.
Additionally, a recent fix was implemented to address issues with watchers accumulating. As mentioned in the fix(nuxt): close top-level watcher on nuxt 'close' pull request, there was a problem where top-level watchers were not being closed when restarting Nuxt, causing them to accumulate.
Given this information, it's possible that the behavior you're experiencing is related to a bug or unintended side effect in Nuxt 3's handling of watchers. It's not clear why switching browser tabs would trigger a watcher, as this shouldn't typically happen.
To further investigate this issue, you might want to:
1. Check if you're using the latest version of Nuxt 3, as some watcher-related issues have been addressed in recent updates.
2. Try to reproduce the issue in a minimal setup to isolate the problem.
3. If the issue persists, consider reporting it on the Nuxt GitHub repository as it may be an unintended behavior that the Nuxt team should investigate.
Remember, watchers should typically only trigger when the watched value changes, not when switching browser tabs. If this behavior is consistent and reproducible, it might indeed be a bug rather than intended functionality.
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