But it's not specifically about enums, but anything from TS that generates code. You would need to stop using enums, parameter properties, namespaces (called out by the proposal) and probably more.

Seems weird to me to decide you're OK with the build step and all the other complexity TS adds, but using enums is too much, because maybe in the future JS runtimes might be able to strip away types for you without a build-step.

But we all have different constraints and use cases, I suppose it does make sense for what you're building.