This Facebook example shows, how Hack transpiler removes Transformable type hint from both transform() and wonderland() functions. Why? Is Transformable some built-in Hack interface or class?
What is "Transformable" in Hack language?
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It's not anything special at all. It's just an example of an arbitrary type annotation. One of the things that the tool does is remove type annotations, such as
Transformable(assuming you had a class calledTransformableyourself), orFoo, orBlah, or any other class you define. There's nothing special aboutTransformableat all.