Cannot use PouchDB as external import in `type="module"` scripts

### Issue

Hey, try this out:

```js
import * as PouchDB from 'https://cdn.jsdelivr.net/pouchdb/latest/pouchdb.js'

console.log(PouchDB)
const db = new PouchDB('alchemist-todo')
```

It fails:

```
Object { … }
Symbol(Symbol.toStringTag): "Module"
Uncaught TypeError: PouchDB is not a constructor
```

I realize this usage isn't in the docs, but, why shouldn't it work these days?

### Info
- Environment: browser
- Platform: Chrome
- Adapter: pre-adapter problem
- Server: N/A