/**
 * @description Adds the property to the object.
 * @export
 * @template {object} Obj
 * @template {Exclude<PropertyKey, keyof Obj>} Name
 * @template Value
 * @template {boolean} [Optional=false]
 * @example
 * const object = { firstName: 'Someone', lastName: 'Someone surname', age: 227 } as const;
 * type Example1 = Add<typeof object, 'city', 'London'>;
 */
export type Add<Obj extends object, Name extends PropertyKey, // or `Exclude<PropertyKey, keyof Obj>` constraint
Value, Optional extends boolean = false> = Name extends keyof Obj ? Obj : Obj & (Optional extends true ? {
    [K in Name]?: Value;
} : {
    [K in Name]: Value;
});