style: set up eslint

.eslintrc.js

@@ -0,0 +1,16 @@
+module.exports = {
+  root: true,
+  parser: '@typescript-eslint/parser',
+  plugins: [
+    '@typescript-eslint',
+  ],
+  extends: [
+    'eslint:recommended',
+    'plugin:@typescript-eslint/recommended',
+  ],
+  rules: {
+    "@typescript-eslint/ban-ts-comment": "warn",
+    "@typescript-eslint/no-explicit-any": "off",
+    "@typescript-eslint/no-unused-vars": "off"
+  }
+};

package.json

@@ -8,13 +8,16 @@
     "email": "[email protected]"
   },
   "scripts": {
-    "lint": "exit 0",
+    "lint": "eslint . --ext .ts",
     "test": "tsc --noEmit"
   },
   "dependencies": {
     "@types/node": "*"
   },
   "devDependencies": {
+    "@typescript-eslint/eslint-plugin": "^4.5.0",
+    "@typescript-eslint/parser": "^4.5.0",
+    "eslint": "^7.12.0",
     "typescript": "^4.0.3"
   },
   "bugs": {