Adding generic type for cookie-session session

[IainMcHugh]

RE:

DefinitelyTyped/types/cookie-session/index.d.ts

Line 83 in 7b6bb68

interface CookieSessionObject {

Instead of having to override the types declaration file in order to correctly type cookie-session session, would a solution be to update CookieSessionObject type to:

type CookieSessionObject<T> = T & {
        /**
         * Is true if the session has been changed during the request.
         */
        isChanged?: boolean | undefined;

        /**
         * Is true if the session is new.
         */
        isNew?: boolean | undefined;

        /**
         * Determine if the session has been populated with data or is empty.
         */
        isPopulated?: boolean | undefined;
}

This generic could then be an optional parameter on the express Request type. Any thoughts on this?