namespace Microsoft.AspNetCore.Identity
{
    public abstract class UserStoreBase<TUser, TRole, TKey, TUserClaim, TUserRole, TUserLogin, TUserToken, TRoleClaim> : UserStoreBase<TUser!, TKey, TUserClaim!, TUserLogin!, TUserToken!>, IUserRoleStore<TUser!>, IUserStore<TUser!>, IDisposable
        where TUser, IdentityUser<TKey>!
        where TRole, IdentityRole<TKey>!
        where TKey, IEquatable<TKey>!
        where TUserClaim, new(), IdentityUserClaim<TKey>!
        where TUserRole, new(), IdentityUserRole<TKey>!
        where TUserLogin, new(), IdentityUserLogin<TKey>!
        where TUserToken, new(), IdentityUserToken<TKey>!
        where TRoleClaim, new(), IdentityRoleClaim<TKey>!
    {
        protected abstract Task<TUserRole?>! FindUserRoleAsync(TKey userId, TKey roleId, CancellationToken cancellationToken);
    }
}