ng build doesn't work in simple setups

[DraTeots]

I believe it could be addressed as a separate issue. Described in the updated set-up instructions

After one sets up phoenix as described in the instruction, ng serve or its alias npm start - works. But ng build will not run falling with multiple errors around require("...").

I used custom builder in Angular.json to setup webpack build. You may look here as an example. For me it was OK as I added some webpack plugins anyway.

But this fix not trivial and may be difficult for HENP people not used to configuring frontend stacks. May there be easier fix?