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34 lines
1.3 KiB
Plaintext
34 lines
1.3 KiB
Plaintext
---
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title: '`Router.onAppUpdated` has been removed'
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---
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## Why This Error Occurred
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Due to [this bug fix](https://github.com/vercel/next.js/pull/3849), we had to remove the `Router.onAppUpdated` hook. But the default functionality of this feature is still in effect.
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We use this hook to detect a new app deployment when switching pages and act accordingly.
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Although there are many things you can do in this hook, it's often used to navigate the page via the server as shown below:
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```js filename="example.js"
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Router.onAppUpdated = function (nextRoute) {
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location.href = nextRoute
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}
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```
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In this hook, you can't wait for a network request or a promise to get resolved. And you can't block the page navigation. So, the things you can do is limited.
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## Possible Ways to Fix It
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One real use of this hook is to persist your application state to local-storage before the page navigation. For that, you can use the [`window.onbeforeunload`](https://developer.mozilla.org/docs/Web/API/WindowEventHandlers/onbeforeunload) hook instead.
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This is code for that:
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```js filename="example.js"
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window.onbeforeunload = function (e) {
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// Get the application state (usually from a store like Redux)
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const appState = {}
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localStorage.setItem('app-state', JSON.stringify(appState))
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}
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```
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