Dead code likely means chunks of code not used by other chunks of code, which should be easy to determine statically in most modern languages. Whether an exposed endpoint is being hit (used) or not as an API is more of a test-code-coverage thing, different from the concept of "dead code".

True, but Bun actually has a similar problem. It's creating bindings to a JS runtime. If the JS glue code then no longer uses it, the code is still marked as alive because it's registered with the runtime.