Opaque class Null safety
Opaque's subtypes represent opaque types in C.
Opaque's subtypes are not constructible in the Dart code and serve purely as markers in type signatures.
- hashCode → int
The hash code for this object. [...]
- runtimeType → Type
A representation of the runtime type of the object.
Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
) → String
A string representation of this object. [...]
Object other) → bool
The equality operator. [...]