eslintrc.json

{
    "env": {
      "browser": true,
      "commonjs": true,
      "es6": true,
      "node": true
    },
    "parserOptions": {
      "ecmaFeatures": {
        "jsx": true
      },
      "sourceType": "module"
    },
    // https://github.com/feross/standard/blob/master/RULES.md#javascript-standard-style
    "extends": "standard",
    // required to lint *.vue files
    "plugins": [
      "html"
    ],
    "rules": {
      "no-const-assign": "warn",
      "no-this-before-super": "warn",
      "no-undef": "warn",
      "no-unreachable": "warn",
      "no-unused-vars": "warn",
      "constructor-super": "warn",
      "valid-typeof": "warn"
    }
  }