# Trying to access extern object

**URL:** <https://community.haxe.org/t/trying-to-access-extern-object/1215>\
**Category:** Haxe\
**Tags:** haxe-js\
**Created:** [October 24, 2018, 11:28pm UTC](https://community.haxe.org/t/trying-to-access-extern-object/1215 "2018-10-24T23:28:19Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Raggaer](https://avatars.discourse-cdn.com/v2/letter/r/e8c25b/32.png) [@Raggaer](https://community.haxe.org/u/Raggaer)\
**Post date:** [October 24, 2018, 11:28pm UTC](https://community.haxe.org/t/trying-to-access-extern-object/1215/1 "2018-10-24T23:28:20Z")

</div>

Hello all.

I am trying to access a NodeJS object (`Game.spawns`) this is a hash map of the class `SpawnStructure`.

Basically on node I am able to do the following `console.log(Game.spawns["Spawn1"].hits)` however on my Haxe code, after declaring some extern classes I keep getting errors:

Main.hx

```haxe
class Main {
	public static function main() {

	}

	@:expose("loop")
	public static function loop() {
		trace(Game.time);
		trace("Hello World lol");
		
	}
}

```

Game.hx

```haxe
package;

extern class Game {
	static var time : Int; 
	static var spawns : Map<String, StructureSpawn>;
}

```

Structure.hx

```haxe
package;

extern class Structure {
	static var hits : Int;
	static var hitsMax : Int;
	static var id : String;
}

```

StructureSpawn.hx

```haxe
package;

extern class StructureSpawn extends Structure {
	static var energy : Int;
	static var energyCapacity : Int;
}

```

If I try the following on my loop function: `trace(Game.spawns["Spawn1"])` I will get the following error:

> TypeError: Cannot read property ‘Spawn1’ of undefined

This is the generated code:

```haxe
// Generated by Haxe 3.4.7
(function ($hx_exports) { "use strict";
var Main = function() { };
Main.main = function() {
};
Main.loop = $hx_exports["loop"] = function() {
	console.log(Game.time);
	console.log("Hello World lol");
	var _this = Game.spawns;
	console.log(__map_reserved["Spawn1"] != null ? _this.getReserved("Spawn1") : _this.h["Spawn1"]);
};
var haxe_IMap = function() { };
var haxe_ds_StringMap = function() {
	this.h = { };
};
haxe_ds_StringMap. __interfaces__ = [haxe_IMap];
haxe_ds_StringMap.prototype = {
	getReserved: function(key) {
		if(this.rh == null) {
			return null;
		} else {
			return this.rh["$" + key];
		}
	}
};
var __map_reserved = {};
Main.main();
})(typeof exports != "undefined" ? exports : typeof window != "undefined" ? window : typeof self != "undefined" ? self : this);

```

Am I missing something? Thanks

---

<div class="post-metadata">

**Author:** ![kevinresol](https://community.haxe.org/user_avatar/community.haxe.org/kevinresol/32/272_2.png) [@kevinresol](https://community.haxe.org/u/kevinresol)\
**Post date:** [October 25, 2018, 9:29am UTC](https://community.haxe.org/t/trying-to-access-extern-object/1215/2 "2018-10-25T09:29:22Z")

</div>

Is `Game.spawns` really a Haxe Map? I doubt that because it is extern.

If it is a plain JS object then you may try:

```haxe
static var spawns : haxe.DynamicAccess<StructureSpawn>;

```