Compilers don't really have the option of just avoiding non-idiomatic code, though. If the goal is to compile TypeScript ahead of time, the only options are to

Compilers don't really have the option of just avoiding non-idiomatic code, though. If the goal is to compile TypeScript ahead of time, the only options are to allow it or to break compatibility, and breaking compatibility makes using ahead-of-time TypeScript instead of some native language that already exists much less compelling.