.eslintrc.json

{
  "parser": "babel-eslint",
  "settings": {
    "react": {
      "version": "16.5"
    }
  },
  "env": {
    "browser": true,
    "es6": true,
    "node": true,
    "jest": true
  },
  "extends": [
    "eslint:recommended", 
    "plugin:react/recommended"
  ],
  "parserOptions": {
    "ecmaFeatures": {
      "experimentalObjectRestSpread": true,
      "jsx": true
    },
    "sourceType": "module",
    "ecmaVersion": 8
  },
  "plugins": [
    "react",
    "jsx-a11y",
    "import"
  ],
  "globals": {
    "t": false
  },
  "rules": {
    // Eslint
    "camelcase": [
      "error",
      { "properties": "never" }
    ],
    "no-unused-vars": [
      "error", 
      { "vars": "all", "args": "none", "ignoreRestSiblings": false }
    ],
    "indent": [
      "error",
      2
    ],
    "prefer-const": [
      "error"
    ],
    "no-loop-func": [
      "error"
    ],
    "no-eval": [
      "error"
    ],
    "new-cap": [
      "error",
      { "capIsNew": false }
    ],
    "no-new-func": [
      "error"
    ],
    "no-var": [
      "error"
    ],
    "no-duplicate-imports": [
      "error"
    ],
    "func-style": [
      "warn",
      "expression",
      { "allowArrowFunctions": true }
    ],
    "no-new-object": [
      "error"
    ],
    "no-array-constructor": [
      "error"
    ],
    "no-useless-escape": [
      "error"
    ],
    "array-callback-return": [
      "error"
    ],
    "prefer-arrow-callback": [
      "error"
    ],
    "arrow-body-style": [
      "error"
    ],
    "arrow-parens": [
      "error",
      "as-needed"
    ],
    "no-confusing-arrow": [
      "error"
    ],
    "prefer-destructuring": [
      "warn",
      { "array": false, "object": true }
    ],
    "object-shorthand": [
      "warn"
    ],
    "prefer-template": [
      "error"
    ],
    "template-curly-spacing": [
      "error"
    ],
    "linebreak-style": [
      "error",
      "unix"
    ],
    "quotes": [
      "error",
      "single",
      { "avoidEscape": true }
    ],
    "quote-props": [
      "error",
      "as-needed"
    ],
    "jsx-quotes": [
      "error",
      "prefer-double"
    ],
    "semi": [
      "error",
      "always"
    ],
    "newline-per-chained-call": [
      "error"
    ],
    "no-whitespace-before-property": [
      "error"
    ],
    "no-useless-constructor": [
      "error"
    ],
    "no-console": [
      "warn",
      { "allow": ["warn", "error"] }
    ],
    "no-multi-spaces": [
      "error",
      { "ignoreEOLComments": true }
    ],
    "object-curly-spacing": [
      "warn",
      "always"
    ],
    "padded-blocks": [
      "warn",
      "never"
    ],
    "no-new-wrappers": [
      "error"
    ],
    "space-in-parens": [
      "error",
      "never"
    ],
    "space-before-blocks": [
      "error"
    ],
    "space-before-function-paren": [
      "error",
      {
        "anonymous": "never",
        "named": "never",
        "asyncArrow": "always"
      }
    ],
    "arrow-spacing": [
      "error"
    ],
    "array-bracket-spacing": [
      "error",
      "never"
    ],
    "prefer-rest-params": [
      "error"
    ],
    "prefer-spread": [
      "error"
    ],
    "dot-notation": [
      "error"
    ],
    "one-var": [
      "error",
      "never"
    ],
    "no-multi-assign": [
      "error"
    ],
    "eqeqeq": [
      "error"
    ],
    "no-unneeded-ternary": [
      "error"
    ],
    "no-nested-ternary": [
      "warn"
    ],
    "brace-style": [
      "error",
      "stroustrup"
    ],
    "curly": [
      "error",
      "multi-or-nest",
      "consistent"
    ],
    "nonblock-statement-body-position": [
      "error",
      "below"
    ],
    "no-else-return": [
      "error"
    ],
    "spaced-comment": [
      "error",
      "always"
    ],
    "eol-last": [
      "error"
    ],
    "space-infix-ops": [
      "error"
    ],
    "keyword-spacing": [
      "error",
      { 
        "overrides": {
          "function": { "after": false }
        }
      }
    ],

    // React
    "react/prop-types": [
      "error",
      { "ignore": ["t"] }
    ],
    "react/prefer-es6-class": [
      "error",
      "always"
    ],
    "react/prefer-stateless-function": [
      "error",
      { "ignorePureComponents": false }
    ],
    "react/jsx-tag-spacing": [
      "error"
    ],
    "react/jsx-closing-bracket-location": [
      "error"
    ],
    "react/jsx-closing-tag-location": [
      "error"
    ],
    "react/self-closing-comp": [
      "error",
      { "component": true }
    ],
    "react/jsx-curly-spacing": [
      "error",
      {"when": "never", "allowMultiline": false, "children": true}
    ],
    "react/jsx-boolean-value": [
      "warn",
      "never"
    ],
    "react/no-string-refs": [
      "error"
    ],
    "react/jsx-wrap-multilines": [
      "error"
    ],
    "react/jsx-no-bind": [
      "error",
      { "allowArrowFunctions": true }
    ],
    "react/require-render-return": [
      "error"
    ],

    // Accessibility
    "jsx-a11y/img-has-alt": [
      "error"
    ],
    "jsx-a11y/img-redundant-alt": [
      "error",
      { "words": ["Foto", "Imagen"] }
    ],
    "jsx-a11y/aria-role": [
      "error",
      { "ignoreNonDom": true }
    ],
    "jsx-a11y/no-access-key": [
      "error"
    ],

    //Import
    "import/no-mutable-exports": [
      "error"
    ],
    "import/prefer-default-export": [
      "error"
    ],
    "import/first": [
      "error"
    ]
  }
}