SyntaxError: Failed to execute 'appendChild' on 'Node': Unexpected token 'export'

## Error

```
Failed to execute 'appendChild' on 'Node': Unexpected token 'export'
```

## Stack trace

```
<anonymous>:1
<anonymous>:1
```

## Tracking Details
- **Project**: exercism-js
- **Sentry**: [SyntaxError: Failed to execute 'appendChild' on 'Node': Unexpected token 'export'](https://thalamus-ai.sentry.io/issues/144707318/)
- **Culprit**: ?(<anonymous>)
- **First seen:** Sep 3, 2026