.eslintrc

{
  "parser": "babel-eslint",

  "root": true,

  "env": {
    // I write for browser
    "browser": true,
    // in CommonJS
    "node": true
  },

  "extends": "eslint:recommended",

  // plugins let use use custom rules below
  "plugins": [
    "babel",
    "react"
  ],

  "ecmaFeatures": {
      "jsx": true,
      "es6": true,
    },

  "rules": {
    // 0 = off
    // 1 = warn
    // 2 = error

    // React specifc rules
    "react/jsx-boolean-value": 0,
    "react/jsx-closing-bracket-location": 1,
    "react/jsx-curly-spacing": [2, "always"],
    "react/jsx-indent-props": [1, 2],
    "react/jsx-no-undef": 1,
    "react/jsx-uses-react": 1,
    "react/jsx-uses-vars": 1,
    "react/wrap-multilines": 1,
    "react/react-in-jsx-scope": 1,
    "react/prefer-es6-class": 1,
    // no binding functions in render for perf
    "react/jsx-no-bind": 1,

    // handle async/await functions correctly
    // "babel/generator-star-spacing": 1,
    // handle object spread
    "babel/object-shorthand": 1,

    "indent": [2, 2, {"SwitchCase": 1}],
    "max-len": [1, 100, 2, {"ignoreComments": true}],
    "no-unused-vars": 1,
    "no-console": 0,
    // semicolons
    "semi": [2, "always"],
    "brace-style": [2, "1tbs", { "allowSingleLine": true }],
    "comma-dangle": [2, "always-multiline"],
    "consistent-return": 0,
    "no-underscore-dangle": 0,
    "quotes": [2, "single"],
    "keyword-spacing": [2],
    "space-before-blocks": [2, "always"],
    "space-before-function-parentheses": [0, "never"],
    "space-in-brackets": [0, "never"],
    "space-in-parens": [2, "never"],
    "space-unary-ops": [1, { "words": true, "nonwords": false }],
    "strict": [2, "never"],
  }
}