.eslintrc.json

{
  "parserOptions": {
    "ecmaVersion": 9,
    "sourceType": "module",
    "ecmaFeatures": { }
  },
  "extends": "eslint:recommended",
  "env": {
    "browser": false,
    "es6": true,
    "node": true
  },
  "rules": {
    "arrow-spacing": "warn",
    "block-scoped-var": "error",
    "dot-notation": "error",
    "dot-location": ["error", "property"],
    "eqeqeq": "error",
    "no-eval": "error",
    "no-multi-spaces": "error",
    "no-param-reassign": "error",
    "no-unused-vars": ["error", { "argsIgnorePattern": "^_" }],
    "no-var": "error",
    "object-curly-spacing": ["warn", "always"],
    "prefer-const": "error",
    "prefer-template": "warn",
    "quotes": ["error", "single", "avoid-escape"],
    "semi": "error",
    "space-before-function-paren": ["error", "never"],
    "space-infix-ops": "error"
  }
}