```
@Retention(RUNTIME)
@Target(TYPE)
public @interface EnumType
```
Annotation used by a Pulumi Cloud Provider Package to mark enum types.
Requirements for an enum to be (de)serialized are as follows. It must:
- Be an enum type decorated with EnumType
- Have a constructor that takes a single parameter of the underlying type. The constructor can be private.
- Have a explicit conversion method annotated with @EnumType.Converter that converts the enum type to the underlying type.
- Implementing toString isn't required, but is recommended and is what our codegen does.

Annotation Type EnumType