Revert "Force compiler error (root)"

This reverts commit d5af727.

Author: mobily

src/keyboard.re

@@ -12,7 +12,7 @@ type event('a) =
  }
  } as 'a;
 
-type listener('a) = event('a) => uni;
+type listener('a) = event('a) => unit;
 
 type keyboardEvent =
  | KeyboardWillShow