Type alias Assign<T, Arr>

Assign<T, Arr>: Arr extends [infer S, ...(infer E)]
    ? Assign<S extends object
        ? __Merge<T, S>
        : T, E>
    : T

Copies all enumerable own properties from one target object to a source array of objects.

type T = Assign<{ a: 'd'; d: 'd' }, [{ a: 'a' }, { b: 'b' }, { c: 'c' }]>
// Result:
{
     a: 'a';
     b: 'b';
     c: 'c';
     d: 'd';
   }