.eslintrc.json

{
  "extends": "eslint:recommended",
  "env": {
    "browser": true,
    "es6": true
  },
  "parserOptions": {
    "ecmaVersion": 2018
  },
  "rules": {
    "no-console": "off",
    "no-extra-parens": ["error", "all"],
    "array-callback-return": "error",
    "curly": "error",
    "default-case": "warn",
    "eqeqeq": ["error", "always"],
    "guard-for-in": "warn",
    "no-caller": "error",
    "no-empty-function": "error",
    "no-eval": "error",
    "no-extra-bind": "error",
    "no-floating-decimal": "error",
    "no-lone-blocks": "error",
    "no-multi-spaces": "error",
    "no-new": "warn",
    "no-return-assign": "error",
    "no-self-compare": "error",
    "no-useless-call": "error",
    "no-undef-init": "error",
    "block-spacing": "error",
    "brace-style": "error",
    "comma-dangle": ["error", "never"],
    "func-call-spacing": ["error", "never"],
    "max-len": ["error", { "code": 120, "ignoreComments": true }],
    "new-cap": ["error", { "newIsCap": true }],
    "new-parens": "error",
    "no-nested-ternary": "error",
    "no-unneeded-ternary": "error",
    "quotes": ["warn", "single", { "avoidEscape": true, "allowTemplateLiterals": true }],
    "arrow-spacing": ["error", { "before": true, "after": true }],
    "no-useless-computed-key": "error",
    "no-useless-constructor": "error",
    "no-prototype-builtins": "off",
    "no-var": "warn",
    "no-unused-vars": ["error", { "vars": "local" }],
    "no-magic-numbers": ["warn", { "ignore": [0, 1] }]
  }
}