Converted the javascript to typescript for help with the developing, ty to the [foundry-vtt-types](https://github.com/League-of-Foundry-Developers/foundry-vtt-types) project.

.eslintrc

@@ -0,0 +1,24 @@
+{
+  "env": {
+    "jquery": true,
+    "browser": true,
+    "es2020": true
+  },
+  "root": true,
+  "parser": "@typescript-eslint/parser",
+  "parserOptions": {
+    "ecmaVersion": 2020,
+    "sourceType": "module"
+  },
+  "extends": ["plugin:@typescript-eslint/recommended"],
+  "rules": {
+    "no-underscore-dangle": "off",
+    "import/extensions": "on",
+    "class-methods-use-this": [
+      "error",
+      {
+        "exceptMethods": ["getData", "_updateObject"]
+      }
+    ]
+  }
+}