The specific thing you’re asking for there is possible but non-trivial if you try to do it at runtime with tools like Playwright; more importantly it’s more ove

The specific thing you’re asking for there is possible but non-trivial if you try to do it at runtime with tools like Playwright; more importantly it’s more overhead than you really need, and runtime types are often not exactly the same as what you want to describe an API, as you’ll be looking at various objects where you then have to decide how much of the prototype chain to walk and lots of other decisions like that. The way most tools in the space work is by leaning on TS’ own programmatic API. The two most interesting such tools I know of are AirBnB’s ts-migrate and LinkedIn’s RehearsalJS (full disclosure: I was loosely involved in design discussions for the matter, but did not contribute to it code-wise).