None Literal

None represents the absence of a value. It is valid for nullable types (T | None):

# Nullable (C# interop)
value: str | None = None

For T | None, bare None emits C# null.

For T? (Optional[T]), use None() — not bare None:

# Optional (Sharpy-native)
x: int? = None()

# x: int? = None   # SPY0604 — bare None belongs to T | None, not T?

See Optional Type for details on T?.

Implementation - ✅ Native - None → null for T | None; None() → Optional<T>.None for T?.