.eslintrc.json

{
  "env": {
    "commonjs": true
  },
  "extends": "eslint:recommended",
  "parser": "babel-eslint",
  "parserOptions": {
    "sourceType": "module",
    "ecmaFeatures": {
      "experimentalObjectRestSpread": true,
      "jsx": true
    }
  },
  "globals": {
    "loadData": false,
    "saveData": false,
    "history": false,
    "console": false,
    "setTimeout": false,
    "clearTimeout": false,
    "setInterval": false,
    "clearInterval": false
  },
  "plugins": [
    "hybrid"
  ],
  "rules": {
    "indent": [
      "warn",
      2
    ],
    "no-console": [
      "warn",
      {
        "allow": [
          "info",
          "warn",
          "error"
        ]
      }
    ],
    "no-unused-vars": [
      "warn",
      {
        "varsIgnorePattern": "prompt"
      }
    ],
    "quotes": [
      "warn",
      "single",
      {
        "avoidEscape": true,
        "allowTemplateLiterals": true
      }
    ],
    "linebreak-style": [
      "warn",
      "unix"
    ],
    "semi": [
      "warn",
      "never"
    ]
  }
}