Rollup Issues

[EricSch]

I'm submitting a...

• Suggestion / Bug

Current behavior

I'm trying to optimize my code. So I changed like recommended an Angular Compiler options:
From "annotationsAs": "decorators" to the Default Settings "static fields". Since then rollup throws errors. The problem is with exported interfaces like "FileRestrictions" in @progress/kendo-angular-upload or "DateFormatOptions" in @progress/kendo-angular-intl. Those files are after compilation empty and rollup can't handle them correctly.
I'm aware it's more an Typescript compilation or rollup issue (see for ex. angular/angular-cli#2034 (comment)), but when those interfaces would exported as classes, the problem would also go away.

Expected behavior

rollup is able to do treeshaking correctly .

If there is any other solution, would happy to hear it.
Thank you

[tsvetomir]

Replacing interfaces with classes seems like an overkill. It will result in larger bundles, as they must be retained in the final output.

Do you have a sample project that reproduces the error? I'd try turning on allowEmptyCodegenFiles
to see if it helps.

[EricSch]

I'm trying to prepare something. Give me some time. Thanks

[tsvetomir]

I'll close this issue as we don't plan immediate actions.
Feel free to reopen if more information becomes available.