Fireproof import returns `undefined` with Parcel bundler

When attempting to import `fireproof` from `@fireproof/core` using Parcel bundler, the imported value is `undefined`.

## Reproduction
### Environment
- @fireproof/core: ^0.19.112
- Parcel: ^2.13.0

### Steps to Reproduce
1. Create a new project with the following package.json:
```json
{
"dependencies": {
"@fireproof/core": "^0.19.112",
"parcel": "^2.13.0"
},
"scripts": {
"start": "parcel index.html"
}
}
```

2. Add the following code:
```javascript
import { fireproof } from '@fireproof/core'

console.log(fireproof === undefined)
```

```html

```

3. Run `npm start`

## Expected Behavior
The `fireproof` import should be a defined value containing the Fireproof functionality.

## Actual Behavior
The `fireproof` import is `undefined`.