Importing ngx-bootstrap stylesheets and dependencies throws errors

[alasdairrobinson]

When trying to test a component that has ngx-bootstrap stylesheets or BsDatePickerComponent as a dependency we're getting errors and component testing fails, for the stylesheet:
SassError: Can't find stylesheet to import.
╷
2 │ @import 'ngx-bootstrap/datepicker/bs-datepicker.scss';

and for the date picker component:
Error: NG0301: Export of name 'bsDatepicker' not found! Find more at https://angular.io/errors/NG0301

Is there an issue with importing from bootstrap?