Can someone point me to a code example (preferably TypeScript or JS) to clarify what the author proposes as an alternative to ‘throw’? Maybe it’s Stockholm Synd

Can someone point me to a code example (preferably TypeScript or JS) to clarify what the author proposes as an alternative to ‘throw’? Maybe it’s Stockholm Syndrome, but I’m struggling to picture how returning an error code (and checking it with an if-statement after every function call) would make code easier for a human to analyse. Seems like it would just make it a lot noisier and less expressive. But I’m intrigued.