Error when trying to use AOT with ngc

[mstawick]

When trying to compile with ngc, I'm getting:

Error: Unexpected value 'DatepickerModule' imported by the module 'SharedModule'

same for TooltipModule and probably every other one.

DatepickerModule is imported (also tried importing from ng2-bootstrap/components/datepicker/datepicker.module):

import { DatepickerModule } from "ng2-bootstrap";

and when building with webpack it works fine.

According to discussion here:
angular/angular#11262

it's due to missing *.metadata.json files.

[valorkin]

yeah, you are right, this is about metadata.json need to generate them additionality
same as #933