Possible to extend types in Typescript?

Question

Say I have the following type:

type Event = {
   name: string;
   dateCreated: string;
   type: string;
}

I now want to extend this type, i

Answer 1

What you are trying to achieve is equivalent to

interface Event {
   name: string;
   dateCreated: string;
   type: string;
}

interface UserEvent extends Event {
   UserId: string; 
}

The way you defined the types does not allow for specifying inheritance, however you can achieve something similar using intersection types, as artem pointed out.