Uncaught TypeError: Convoy is not a constructor

I am using node 18.15, and trying to get self-hosted version of Convoy to work..
```
const Convoy = require("convoy.js");
const convoy = new Convoy({
  api_key: "test1",
  uri: "https://test2.com",
  project_id: "test3"
});
```

returns:
```
Uncaught TypeError: Convoy is not a constructor
```

any idea what I am doing wrong here?