There’s a pretty common typescript helper called Prettify:

type Prettify<T> = {
    [K in keyof T]: T[K];
} & {};

It is meant to get more helpful type displays in your IDEs and error messages. I never understood why there’s an intersection with an object type at the end. Can someone explain? Why is it not just:

type Prettify<T> = {
    [K in keyof T]: T[K];
}