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Sep 10, 2025
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docs(cloudflare): Add FinalizationRegistry trouble-shooting #182

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docs: Add FinalizationRegistry touble-shooting
ByungJin-Lee Sep 10, 2025
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fixup! format
vicb Sep 10, 2025
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20 changes: 20 additions & 0 deletions pages/cloudflare/troubleshooting.mdx
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Expand Up @@ -125,3 +125,23 @@ X [ERROR] Could not resolve "<package name>"
It might be because the package contains workerd specific code.

Check this [howto](/cloudflare/howtos/workerd) for a solution.

### `ReferenceError: FinalizationRegistry is not defined`

If you encounter this error when using features that rely on modern JavaScript APIs:

```text
✘ [ERROR] ⨯ ReferenceError: FinalizationRegistry is not defined
```

This error occurs because the `FinalizationRegistry` API is not available in older Cloudflare Workers compatibility dates.

To fix this issue, update your `compatibility_date` in `wrangler.toml` or `wrangler.jsonc` to `2025-05-05` or later:

```json
{
"compatibility_date": "2025-05-05"
}
```

Refer to the [Cloudflare Workers compatibility flags documentation](https://developers.cloudflare.com/workers/configuration/compatibility-flags/#enable-finalizationregistry-and-weakref) for more details.
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