TypeError: dayjs_1.default is not a function

**Describe the bug**
Similar to this https://github.com/iamkun/dayjs/issues/475
```
TypeError: dayjs_1.default is not a function
controls: 20 | },
controls: 21 | 'RollupEstActiveUsers': 1,
controls: > 22 | 'EstCompletionDate': dayjs('1111-11-11'),
```
**Expected behavior**
For my tests to pass and not consider dayjs to not be a function.

**Information**
- Day.js Version 1.10.7
- OS: MacOs and Windows
- Browser Chrome 94.0.4606.7
- Time zone: (Pacific Daylight Time)

Start with the failing test at the `EstCompletionDate` call shown in the report and inspect how Day.js 1.10.7 is imported and executed in that test environment. Compare the setup with the linked Day.js issue; done means the test treats `dayjs` as callable and passes on the reported environments.

Written by the indexing model from the issue text.