WebSocket `watchBlocks` with `emitOnBegin: true` does not handle connection errors properly

[oskarlh]

Check existing issues

• I checked there isn't already an issue for the bug I encountered.

Viem Version

2.24.1

Current Behavior

When

• you use a PublicClient
• with the webSocket transport
• and call watchBlocks with the emitOnBegin option,
• and you do not have an Internet connection
  The script crashes with an error logged to console

Expected Behavior

When

• you use a PublicClient
• with the webSocket transport
• and call watchBlocks with the emitOnBegin option
• and you do not have an Internet connection
  The onError handler is called

Steps To Reproduce

• Add something to keep the script alive (like a setInterval)
• Disable your Internet connection.
• Create a PublicClient
• with the webSocket transport,
• call watchBlocks with the emitOnBegin option
• Observe that the script stops, with errors logged to stdout

Link to Minimal Reproducible Example

https://github.com/oskarlh/viem-bug

Anything else?

No response

[github-actions]

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If you found a concrete bug or regression related to it, please open a new bug report with a reproduction against the latest Viem version. If you have any questions or comments you can create a new discussion thread.