API: Move vim_to_object to helpers.c

src/api/helpers.h

@@ -4,6 +4,7 @@
 #include <stdbool.h>
 
 #include "api/defs.h"
+#include "../vim.h"
 
 #define set_api_error(message, err)                \
   do {                                             \
@@ -21,5 +22,12 @@ void try_start(void);
 /// @return true if an error occurred
 bool try_end(Error *err);
 
+/// Convert a vim object to an `Object` instance, recursively expanding
+/// Arrays/Dictionaries.
+///
+/// @param obj The source object
+/// @return The converted value
+Object vim_to_object(typval_T *obj);
+
 #endif /* NEOVIM_API_HELPERS_H */