Angular class is not an Angular module

Question

When I build my Angular library, publish it to npm, and use it as a dependency in another project, whenever I try to import on of my module classes into my app.module.

Answer 1

So I had the same issue with a different solution, so I thought I would share it here.

I had just updated my library to Angular 9. And everything seemed fine except the strange "Class my-module is not an Angular module" error.

What worked for me was to up tsconfig.lib.ts file with:

...
"angularCompilerOptions": {
  ...,
  "enableIvy": false
}