I have a function

function getExtendedObject<T extends object>( currentObject: T ) {
  return {
    ...currentObject,
    newProp: "value1",
    anotherProp: () => "something"
  }
}

i need to get the return type of this function for a specific input.

type example = ReturnType<typeof getExtendedObject>

the above will give me

type example = object & {
    newProp: string;
    anotherProp: number;
}

but instead of object, i want a specific value. something like,

type example = { name: "john", marks: 91 } & {
    newProp: string;
    anotherProp: number;
}

how can i achieve this