lint-angular | Example repo to lint an angular project | Frontend Framework library

I'm using the latest versions of all Angular-related packages (so Angular 10).

I want to add some code to a component, but I only want this code to exist in dev, never in a production build. It needs to be completely stripped in prod builds. I found this comment, which indicates that environments do this automatically (because they're const).

I tried using that exact code in my app, but the dev code is still there in a production build. I copied the code over to a new test app that I made with ng new, and it does work properly there.

What things should I be looking for, how can I fix this? Is this possibly because I have CommonJS dependencies, and if so, can I do anything about that (since I can't remove those dependencies)?

Some notes:

• An issue has been opened on the angular-cli repo here.
• The environment object is never written to anywhere in the codebase, I've searched thoroughly. (It's only used in a few places anyway.)
• Code bounded with if (false) { } is properly stripped.
• Removing the services export from the end of environment{.prod}.ts does not fix the problem.
• Removing all CommonJS dependencies does not fix the problem.

Here's environment.prod.ts (environment.ts is the same, just with false instead of true):