pub type napi_finalize = Option<unsafe extern "C" fn(env: NapiEnv, finalize_data: *mut c_void, finalize_hint: *mut c_void)>;
enum napi_finalize { None, Some(unsafe extern "C" fn(NapiEnv, *mut c_void, *mut c_void)), }
No value.
Some value of type T.
T