Is domain property required? - CookieStorage Interface

[doutori]

Is your feature request related to a problem? Please describe.
Auth / Cognito with cookieStorage

CookieStorage interface is below.

interface ICookieStorageData {
	domain: string;
	path?: string;
	expires?: number;
	secure?: boolean;
	sameSite?: 'strict' | 'lax' | 'none';
}

amplify-js/packages/amazon-cognito-identity-js/src/CookieStorage.js

Line 18 in cffb932

throw new Error('The domain of cookieStorage can not be undefined.');

Is there a reason a domain property is required?
When we specify the domain of the cookie, it will be sent to the subdomain.
It's not secure.

Describe the solution you'd like
Cookie domain property should be Optional.

Describe alternatives you've considered

Additional context

[alexan]

is there a possibility to use cookie storage but not send the cookies to all subdomains?