Fixed typescript type errors

src/js/game/map_chunk.js

@@ -433,7 +433,7 @@ export class MapChunk {
      * Sets the chunks contents
      * @param {number} tileX
      * @param {number} tileY
-     * @param {Entity=} contents
+     * @param {Entity} contents
      * @param {Layer} layer
      */
     setLayerContentFromWorldCords(tileX, tileY, contents, layer) {

src/js/savegame/serialization.js

@@ -138,7 +138,7 @@ export const types = {
 
 /**
  * A full schema declaration
- * @typedef {Object.<string, BaseDataType>} Schema
+ * @typedef {Object.<string, BaseDataType> | object} Schema
  */
 
 const globalSchemaCache = {};