Dynamic Imports broken when pointing at a barrel file

[FrozenPandaz]

🐞 Bug report

Command (mark with an x)

[x] build --aot
[x] serve --aot

Is this a regression?

Sort of, using a loadChildren string works. But Dynamic imports which are supposed to be a drop in replacement, do not work.

Description

When a loadChildren callback uses a dynamic import to bring in a lazy loaded module from a barrel file, the path gets changed to ./path-to-barrel.ngfactory in AoT. Which does not work.

🔬 Minimal Reproduction

https://github.com/FrozenPandaz/angular-bugs/tree/dyna-imp-bug

🔥 Exception or Error

Module not found: Error: Can't resolve './shared.ngfactory' in '/home/jason/projects/temp/test-proj/src/app'

The src is

loadChildren: import('./shared').then(mod => mod.LazyModule)

🌍 Your Environment

Latest rc

Anything else relevant?
This is important for Nx, which has public apis for its libs.

[FrozenPandaz]

@filipesilva Can we bump this to a freq2: medium?

The migration will have dynamic imports everywhere and lots of users may encounter this after that.

Also, Nx has a fair amount of users which would all encounter this.

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