Null Object Generator

[GenerateNullObject] generates a sealed Null Object implementation for an interface contract.

[GenerateNullObject(TypeName = "NullInventoryNotifier")]
public interface IInventoryNotifier
{
    [NullObjectDefault(false)]
    bool CanDeliver { get; }

    [NullObjectDefault("suppressed")]
    string Notify(string sku);
}

Generated output includes:

• a sealed implementation of the contract
• a static Instance property
• no-op void methods
• deterministic defaults for strings, booleans, numeric values, arrays, Task, Task<T>, ValueTask, and ValueTask<T>
• per-member defaults through [NullObjectDefault]

Use the generated implementation directly or wrap it with NullObject<TContract> for consistent dependency injection registration.