Handle object returns from get_raw_buffer_to_array (#468)

CHANGELOG.md

@@ -16,6 +16,7 @@ Unreleased
 
 - Implement `JsCollectionIntoValue` for `Direction`, making the `JsHashMap` returned by
   `game::map::describe_exits` able to be used
+- Handle object return properly from `RoomTerrain::get_raw_buffer_to_array` when built in dev mode
 
 0.16.1 (2023-10-11)
 ===================

src/objects/impls/room_terrain.rs

@@ -30,7 +30,7 @@ extern "C" {
 
     // and when called with a destination, it can only ever return a return code int
     #[wasm_bindgen(method, js_name = getRawBuffer)]
-    fn get_raw_buffer_to_array_internal(this: &RoomTerrain, destination: &Uint8Array) -> i8;
+    fn get_raw_buffer_to_array_internal(this: &RoomTerrain, destination: &Uint8Array) -> JsValue;
 }
 
 impl RoomTerrain {
@@ -58,6 +58,13 @@ impl RoomTerrain {
     /// [Screeps documentation](https://docs.screeps.com/api/#Room.Terrain.getRawBuffer)
     #[inline]
     pub fn get_raw_buffer_to_array(&self, destination: &Uint8Array) -> Result<(), ErrorCode> {
-        ErrorCode::result_from_i8(self.get_raw_buffer_to_array_internal(destination))
+        let val = self.get_raw_buffer_to_array_internal(destination);
+
+        // val is integer if error; if object it's another reference to the Uint8Array;
+        // function was successful in that case
+        match val.as_f64() {
+            Some(n) => ErrorCode::result_from_i8(n as i8),
+            None => Ok(()),
+        }
     }
 }