.eslintrc.json

{
  "env": {
    "browser": true,
    "node": true,
    "es6": true,
    "webextensions": true
  },
  "extends": [
    "eslint:recommended",
    "plugin:react/recommended"
  ],
  "plugins": [
    "react",
    "promise"
  ],
  "rules": {
    "constructor-super": "warn",
    "eqeqeq": "error",
    "no-const-assign": "warn",
    "no-this-before-super": "warn",
    "no-undef": "warn",
    "no-unreachable": "warn",
    "no-unused-vars": "warn",
    "no-var": "error",
    "prefer-const": "error",
    "quotes": ["error", "single", {"avoidEscape": true}],
    "semi": ["error", "always"],
    "valid-typeof": "warn",
    "react/jsx-uses-react": "error",
    "react/jsx-uses-vars": "error",
    "promise/avoid-new": "warn",
    "promise/catch-or-return": "error",
    "promise/no-callback-in-promise": "warn",
    "promise/no-promise-in-callback": "warn",
    "promise/no-return-wrap": "error",
    "promise/param-names": "error"
  },
  "parserOptions": {
    "sourceType": "module",
    "ecmaFeatures": {
      "experimentalObjectRestSpread": true,
      "jsx": true
    }
  }
}