TypeScript, by design, does not produce nor introduce any "noisy defensive code": the point of TypeScript was that type-safety in JavaScript can be achieved without any runtime cost.

The only significant code-gen that TypeScript does do by itself is stuff relating to ECMAScript modules (e.g. wrapping and repackaging your TypeScript module for other module systems).

...with the exception of when you take a modern TypeScript compiler and specifically instruct it to target ES3 (lol) or perhaps some older variants of ES5 - at which point the code `tsc` generates is still so minimal you'll still need to bring-your-own polyfill/monkeypatch libraries. This is stuff like reimplementing the spread-operator or `for(of)`, and so on.