Simple eslint and prettier config + dependencies in package.json so it will format on save

.eslintrc.json

{
    "env": {
        "es2021": true,
        "node": true
    },
    "extends": ["eslint:recommended", "prettier"],
    "parserOptions": {
        "ecmaVersion": 12,
        "sourceType": "module"
    },
    "plugins": ["prettier"],
    "rules": {
        "no-unused-vars": "warn",
        "prettier/prettier": "error"
    }
}

.prettierrc.json

{
  "trailingComma": "es5",
  "tabWidth": 2,
  "printWidth": 100,
  "singleQuote": false,
  "semi": true,
  "arrowParens": "avoid",
  "bracketSpacing": true
}

package.json

{
  "dependencies": {
    "eslint": "^8.5.0"
  }
  "devDependencies": {
    "eslint-config-prettier": "^8.3.0",
    "eslint-plugin-prettier": "^4.0.0",
    "prettier": "^2.5.1"
  }
}