#Persistent `TypeError: undefined is not an object` in production

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split muralBOT
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Hi @worn root. 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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I'm sorry you're encountering this persistent error. Based on the information in the knowledge sources, here’s what can be determined:

  • Astro’s <ClientRouter /> and view transitions scripts do inject code that references navigation lifecycle events like astro:before-preparation, and may interact with browser APIs such as the View Transitions API and the Navigation API. These scripts are designed to fall back gracefully in browsers that do not fully support these APIs, but there are known limitations and edge cases, especially with partial implementations in some browsers [View transitions guide].
  • The fallback behavior for unsupported browsers can be controlled via the fallback prop on <ClientRouter />, but if you have already removed all references to ClientRouter and astro:transitions from your source and layouts, these scripts should not be present in your build [Fallback control].
  • If you are still seeing references to view transition scripts in your final dist/ output after removing all usage, it suggests that either:
    • There is still a reference somewhere in your codebase or a dependency is injecting it.
    • The build cache is not fully cleared, or a third-party integration is including it.

The knowledge sources do not provide a direct solution for the specific issue with Brave Mobile on iOS, especially regarding partial implementations of window.navigation. There is no documented workaround for this particular browser quirk in the official Astro documentation.

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What you can try, based on the docs:

  • Double-check that no component, layout, or integration is importing from astro:transitions or using <ClientRouter />.
  • Ensure that your build is completely clean (delete dist/, .astro, and any cache directories before building).
  • If you are using prefetching, note that it is enabled by default when <ClientRouter /> is present, but should not be if you have removed it [Prefetch with View Transitions].
  • If the error persists even after all references are removed, and you have confirmed this in the built output, it may be a bug in Astro or a side effect of an integration. In that case, consider opening an issue with a minimal reproduction on the Astro GitHub, as the documentation does not cover this scenario.

Summary:
The knowledge sources do not contain enough information to provide a definitive fix for this Brave Mobile iOS-specific error, especially when all view transition features have been removed from your project. This may be an edge case or bug that requires further investigation by the Astro team.

If you have a minimal reproduction, reporting it to the Astro maintainers is recommended.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

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