/**
 * This is normally used for reusable shareable configs that have multiple
 * shared options with default values that should be used. This basically works
 * just like `defaultProps` in react.
 *
 * @internal
 * @param optional The original object that has the optional/omitted values
 * @param required The required default values that should be used to fill the
 * optional object with
 * @return a new object with both the values of the optional and required
 * objects but use the optional values if they were defined.
 */
export default function defaults<O extends {}, R extends {}>(optional: O, required: R): O & R;