Prepare support for adding extra elements to map layers

src/model/data/map.ts

@@ -1,14 +1,18 @@
 import { Collision } from './collision';
 
+export interface MapLayer {
+	readonly tiles: number[][];
+}
+
 export interface MapDataInput {
 	readonly tiles: string[];
-	readonly layers: number[][][];
+	readonly layers: MapLayer[];
 	readonly collision: Collision[];
 }
 
 export class MapData {
 	public readonly tiles: string[];
-	public readonly layers: number[][][];
+	public readonly layers: MapLayer[];
 	public readonly collision: Collision[];
 
 	public readonly width: number;
@@ -19,7 +23,7 @@ export class MapData {
 		this.layers = data.layers;
 		this.collision = data.collision;
 
-		this.height = this.layers[0].length;
-		this.width = this.layers[0][0].length;
+		this.height = this.layers[0].tiles.length;
+		this.width = this.layers[0].tiles[0].length;
 	}
 }