[klodolph]

TypeScript is in a unique position. It's basically a set of extensions to JavaScript, and with a very short list of exceptions, those extensions only affect the type system. You can mostly just convert TypeScript to JavaScript by going through your source files, selecting various ranges of text, and pressing "delete" on your keyboard. This is more or less how the TypeScript compiler compiles your code anyway.

The exception I can think of is enum types. These always result in some amount of generated code.

TypeScript can also apply some other transformations to your code during compilation, but as far as I know that's just so you can use newer JavaScript language features and target older JavaScript runtimes.