Ng serve throwing @angular/core/core has no exported member 'eeFactoryDef'

Question

Im getting like 50 errors that all say that angular/core/core has no exported member \'eeFactoryDef\'.

They come from different node_modules, for example angular/cdk

Answer 1

I ran into this after updating some packages (including Angular from 8 to 9), then downgrading again.

The solution was to nuke the node_modules folder and then do a fresh npm install.