.eslintrc.json

{
  "parser": "babel-eslint",
  "env": {
    "browser": true,
    "es6": true,
    "jest": true
  },
  "extends": ["eslint:recommended", "plugin:react/recommended", "plugin:prettier/recommended"],
  "parserOptions": {
    "ecmaFeatures": {
      "experimentalObjectRestSpread": true,
      "jsx": true
    },
    "sourceType": "module"
  },
  "plugins": ["react", "prettier"],
  "globals": {
    "process": true,
    "module": true,
    "browser": true,
    "$": true,
    "$$": true
  },
  "rules": {
    "prettier/prettier": [
      "error",
      {
        "printWidth": 100,
        "arrowParens": "always",
        "trailingComma": "es5"
      }
    ],
    "indent": [
      "error",
      2,
      {
        "SwitchCase": 1
      }
    ],
    "linebreak-style": ["error", "unix"],
    "quotes": ["error", "double", { "allowTemplateLiterals": true }],
    "semi": ["error", "always"],
    "max-len": ["error", { "code": 120 }],
    "no-console": "warn",
    "space-before-blocks": "error",
    "keyword-spacing": "error",
    "eol-last": "error",
    "no-trailing-spaces": "error",
    "newline-before-return": "error",
    "curly": "error",
    "comma-spacing": "error",
    "object-curly-spacing": ["error", "always"],
    "key-spacing": "error",
    "arrow-parens": ["error", "always"],
    "arrow-spacing": "error",
    "no-var": "error",
    "prefer-const": "error",
    "no-warning-comments": "warn",
    "react/jsx-no-target-blank": "off",
    "no-fallthrough": "off"
  }
}