The closest discussion topic I've found, How can you share bundles in an angular 5 application?, is for Angular 5 and unresolved. Angular 6 allows multiple apps in a single project. With this, I would expect that child apps could be configured to share build bundles such as polyfills, runtime, styles, etc. However, this seems not to be the case.
In the angular.json file, I've tried to set the paths in the child app's build.options to point to the primary app's files but the issue is that the output bundles still have different hashes.
Creating a library also wouldn't work because those are for user code, not the Angular generated bundles listed above.
Is there an Angular way to do this without writing a shell script?