Type check … rest fields of an object with Typescript

Question

I want to write an interface or type with typescript to enforce the type of known fields, and also some dynamic ones.

Example:

const person = {
   children: [person1, person2],
   name: "X",
   dynamicField1: person3,
   dynamicField2: person4,
   dynamicField3: person5 
}

// Something that would look like this
interface Person {
  name: string;
  children: Person[];
  ...rest: Person;
}

Is it possible to to that in typescript?

Answer 1

Is it possible to to that in typescript?

Yep, you can have your Person interface extend a record which allows any key/value like this:

interface Person extends Record<any, any> {
    name: string;
    children: Person[];
}