```
@Documented
@TypeQualifierDefault({METHOD,PARAMETER,TYPE_PARAMETER})
@Nonnull
@Retention(RUNTIME)
@Target(PACKAGE)
public @interface NonnullByDefault
```
Indicates that method return types and method parameters in the annotated package are Nonnull unless explicitly annotated with Nullable.
This annotation is a generalization of ParametersAreNonnullByDefault. All Pkl packages containing Java code should carry this annotation.
Ideally, this default would apply to every ElementType.TYPE_USE, but I haven't been able to make this work reasonably in IntelliJ (https://youtrack.jetbrains.com/issue/IDEA-278618).

Annotation Type NonnullByDefault