Generic repository interface

IRepository.cs

public interface IRepository<TAggregateRoot> where TAggregateRoot : IAggregateRoot
{
    public void Add(params TAggregateRoot[] entities);

    public void Remove(params TAggregateRoot[] entities);

    public Task<TAggregateRoot?> SingleOrDefaultAsync(
        ISpecification<TAggregateRoot> specification,
        CancellationToken cancellationToken = default);

    public Task<TResult?> SingleOrDefaultAsync<TResult>(
        ISpecification<TAggregateRoot, TResult> specification,
        CancellationToken cancellationToken = default);

    public Task<TAggregateRoot?> SingleOrDefaultByIdAsync<TId>(
        TId entityId,
        CancellationToken cancellationToken = default)
        where TId : IId;

    public Task<IList<TAggregateRoot>> ListAsync(
        ISpecification<TAggregateRoot> specification,
        CancellationToken cancellationToken = default);

    public Task<IList<TResult>> ListAsync<TResult>(
        ISpecification<TAggregateRoot, TResult> specification,
        CancellationToken cancellationToken = default);

    public Task<bool> IsUniqueAsync(ISpecification<TAggregateRoot> specification, IId? existingId);

    public Task<int> DeleteAsync(
        ISpecification<TAggregateRoot> specification,
        CancellationToken cancellationToken = default);
}