Unmounting Hooks
Hello Kapa
When a component is Unmounted, are the hooks he was using removed/discard/unregistered automatically ? Or do I have to do it manually in an onUnmounted() ?
thx
5 Replies
Hi @Omnislash. 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, I can give you information about hook cleanup in Nuxt.
According to the documentation, Nuxt provides a
useRuntimeHook composable that automatically handles hook cleanup. The useRuntimeHook composable "registers a runtime hook in a Nuxt application and ensures it is properly disposed of when the scope is destroyed."
This means that when you use useRuntimeHook, the hook will be automatically unregistered when the component is unmounted - you don't need to manually clean it up in onUnmounted().
Here's an example of how to use it:
The knowledge sources also mention that Nuxt migrated to the hookable package, which "allows us to unregister hooks" - this is the underlying mechanism that enables automatic cleanup.
So to answer your question directly: Yes, when using useRuntimeHook, hooks are automatically removed/discarded/unregistered when the component is unmounted. You don't need to manually handle this in onUnmounted().
However, the knowledge sources don't explicitly cover all types of hooks or event listeners you might register manually (like the window.addEventListener example shown in one of the Stack Overflow posts), which would still need manual cleanup in onUnmounted().
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@kapa.ai
so if I do this in the setup :
I have nothing to do afterwar ?
Let me check the knowledge base for you again. One moment! :books:
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Based on the knowledge sources provided, I need to clarify my previous response regarding
nuxtApp.hook().
The knowledge sources show examples of using nuxtApp.hook() directly (like in the Stack Overflow examples and GitHub issues), but they do not explicitly state whether hooks registered with nuxtApp.hook() are automatically cleaned up when a component is unmounted.
The knowledge sources mention that Nuxt migrated to the hookable package which "allows us to unregister hooks," but this doesn't confirm automatic cleanup behavior for nuxtApp.hook() specifically.
For your specific case:
I cannot definitively confirm from the knowledge sources whether this hook will be automatically cleaned up when your component unmounts. The knowledge sources don't provide explicit information about the lifecycle management of hooks registered with nuxtApp.hook() in component setup.
To be safe, if you're concerned about potential memory leaks or unwanted hook executions after component unmount, you may want to manually unregister the hook in onUnmounted(), though the knowledge sources don't provide the specific API for doing so with nuxtApp.hook().
I apologize that I cannot give you a more definitive answer based on the available knowledge sources.
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Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:
----------------------<@305772639438503936> Kapa.ai is still learning and improving, please let me know how I did by reacting below.