Add eslint and fix warnings

Author: dibarbet

.eslintrc.js

@@ -0,0 +1,32 @@
+module.exports = {
+    env: {
+        node: true
+    },
+    extends: [
+        "eslint:recommended",
+        "plugin:@typescript-eslint/recommended"
+    ],
+    parser: "@typescript-eslint/parser",
+    plugins: [
+        "@typescript-eslint"
+    ],
+    root: true,
+    rules: {
+        "@typescript-eslint/no-explicit-any": "off",
+        "@typescript-eslint/no-non-null-assertion": "off",
+        "@typescript-eslint/semi": ["error", "always"],
+        // Allow unused vars if prefixed by _
+        "@typescript-eslint/no-unused-vars": [
+            "warn",
+            { 
+                "argsIgnorePattern": "^_",
+                "varsIgnorePattern": "^_",
+                "caughtErrorsIgnorePattern": "^_"
+            }
+        ],
+    },
+    ignorePatterns: [
+        "out/",
+        "dist/"
+    ],
+};