nullable top-level constant Null safety

Object const nullable
@Deprecated("Dart not support non-nullable types")

An element annotated with @nullable claims null value is perfectly valid to return (for methods), pass to (parameters) and hold (local variables and fields).

Apart from documentation purposes this annotation is intended to be used by static analysis tools to validate against probable runtime errors and element contract violations.

Implementation

@Deprecated("Dart not support non-nullable types")
const Object nullable = _Nullable();