.eslintrc.json

{
  "env": {
    "browser": true,
    "es6": true,
    "jest": true
  },
  "extends": ["airbnb-base", "plugin:jest/recommended"],
  "overrides": [],
  "plugins": ["import", "jest"],
  "rules": {
    "max-len": [
      "error",
      {
        "code": 120
      }
    ],
    "linebreak-style": "off",
    "no-plusplus": "off",
    "no-param-reassign": "off",
    "no-unused-expressions": "off",
    "no-return-assign": "off",
    "no-console": "error",
    "no-debugger": "error",
    "no-tabs": "error",
    "semi": ["error", "always"],
    "space-before-blocks": "error",
    "import/first": "error",
    "import/newline-after-import": "error",
    "import/no-duplicates": "error",
    "no-multiple-empty-lines": [
      "error",
      {
        "max": 1,
        "maxEOF": 1,
        "maxBOF": 0
      }
    ],
    "no-underscore-dangle": "off",
    "import/extensions": [
      "error",
      "ignorePackages",
      {
        "js": "ignorePackages",
        "jsx": "never"
      }
    ],
    "jest/no-disabled-tests": "warn",
    "jest/no-focused-tests": "error",
    "jest/no-identical-title": "error",
    "jest/prefer-to-have-length": "warn",
    "jest/valid-expect": "error"
  }
}