add eslint

.eslintrc.js

@@ -0,0 +1,27 @@
+module.exports = {
+    env: {
+        node: true,
+    },
+    // Specify the parser for TypeScript
+    parser: "@typescript-eslint/parser",
+    parserOptions: {
+        ecmaVersion: 2020, // Allows for the parsing of modern ECMAScript features
+        sourceType: "module", // Allows for the use of imports
+    },
+    // existing ESLint configuration
+    extends: [
+        "eslint:recommended",
+        "plugin:@typescript-eslint/recommended",
+        "plugin:prettier/recommended", // Adds the Prettier plugin
+    ],
+    plugins: ['@typescript-eslint', 'prettier'],
+    rules: {
+        "prettier/prettier": "error", // Displays Prettier errors as ESLint errors
+        prefer_const: "warn", // prefers using "const" for variables that are not reassigned
+        no_var: "error", // disallows the use of "var", must use "let" or "const" only
+
+        // TS rules
+        "@typescript-eslint/no-explicit-any": "warn", // Warns when using "any" type
+        "@typescript-eslint/no-unused-vars": ["warn", { argsIgnorePattern: "^_" }], // warns against any used variables except those prefixed with "_"
+    },
+};

package.json

@@ -1,8 +1,20 @@
 {
+  "license": "AGPL-3.0-or-later",
   "devDependencies": {
+    "@eslint/js": "^9.13.0",
     "@types/uuid": "^9.0.8",
+    "@typescript-eslint/eslint-plugin": "^8.11.0",
+    "@typescript-eslint/parser": "^8.11.0",
+    "eslint": "^9.13.0",
+    "eslint-config-prettier": "^9.1.0",
+    "eslint-plugin-prettier": "^5.2.1",
+    "globals": "^15.11.0",
+    "husky": "^9.1.6",
+    "lint-staged": "^15.2.10",
+    "prettier": "^3.3.3",
     "ts-node": "^10.9.2",
-    "typescript": "^5.4.2"
+    "typescript": "^5.4.2",
+    "typescript-eslint": "^8.11.0"
   },
   "dependencies": {
     "@typegoose/typegoose": "^12.2.0",
@@ -11,5 +23,21 @@
     "stripe": "^14.21.0",
     "typeorm": "^0.3.20",
     "uuid": "^9.0.1"
+  },
+  "scripts": {
+    "prepare": "husky",
+    "lint": "eslint . --ext .js,.jsx,.ts,.tsx",
+    "lint:fix": "eslint . --ext .js,.jsx,.ts,.tsx --fix",
+    "format": "prettier --write .",
+    "test": ""
+  },
+  "lint-staged": {
+    "*.{js,jsx,ts,tsx}": [
+      "eslint --fix",
+      "prettier --write"
+    ],
+    "*.{json,css,scss,md}": [
+      "prettier --write"
+    ]
   }
 }