Describe the bug
Broken after Angular 9.1 upgrade
Screenshots
If applicable, add screenshots to help explain your problem.

Demo
Provide an online demo (stackblitz, codesandbox, or similar) where the issue can be reproduced
ngx-charts version
13.0.2
can confirm that.
Strange, it didn't happened to me.
Have you tried deleting node_modules?
Angular 9.1 works for me
Try to delete @swimlane folder and run npm install once again
indeed, helped for me.
We updated to ng9.1 recently so this should be working now, can someone confirm?
This has never been broken in the first place. My guess is that ivy compiler had something dirty and it was easily fixable by deleting @swimlane folder under node_modules and run npm install once again.
I have used v13.0.2 with Angular 9.1 without issues.
By the way, I have now updated to v13.0.3 and it seems to be working as before.