fixes #48 and fixes #49 enable linter and fix linting issues

Author: George Griffiths

.eslintrc.js

@@ -0,0 +1,13 @@
+module.exports = {
+    "env": {
+        "browser": true,
+        "es2021": true,
+        "node": true,
+    },
+    "extends": "eslint:recommended",
+    "parserOptions": {
+        "ecmaVersion": 12,
+        "sourceType": "module"
+    },
+    "rules": { "semi": ["error", "always"]}
+};