.eslintrc

{
  "root": true,

  "parser": "babel-eslint",

  "plugins": [
    "flowtype"
  ],

  "env": {
    "es6": true,
    "node": true
  },

  "extends": "eslint:recommended",

  "rules": {

    /* Possible Errors */

    "no-await-in-loop": "error",
    "no-empty": ["error", { "allowEmptyCatch": true }],
    "no-prototype-builtins": "error",
    "no-template-curly-in-string": "error",
    "no-unsafe-negation": "error",

    /* Best Practices */

    "accessor-pairs": "error",
    "array-callback-return": "error",
    "block-scoped-var": "error",
    "consistent-return": "error",
    "curly": ["error", "all"],
    "dot-location": ["error", "property"],
    "dot-notation": ["error", { "allowPattern": "^[a-z]+(_[a-z]+)+$" }],
    "eqeqeq": "error",
    "guard-for-in": "error",
    "no-alert": "error",
    "no-caller": "error",
    "no-empty-function": "error",
    "no-eval": "error",
    "no-extend-native": "error",
    "no-extra-bind": "error",
    "no-floating-decimal": "error",
    "no-global-assign": "error",
    "no-implied-eval": "error",
    "no-iterator": "error",
    "no-labels": "error",
    "no-lone-blocks": "error",
    "no-loop-func": "error",
    "no-multi-spaces": "error",
    "no-multi-str": "error",
    "no-new-func": "error",
    "no-new-wrappers": "error",
    "no-new": "error",
    "no-octal-escape": "error",
    "no-proto": "error",
    "no-return-assign": "error",
    "no-return-await": "error",
    "no-script-url": "error",
    "no-self-compare": "error",
    "no-sequences": "error",
    "no-throw-literal": "error",
    "no-unmodified-loop-condition": "error",
    "no-unused-expressions": "error",
    "no-useless-call": "error",
    "no-useless-concat": "error",
    "no-useless-escape": "error",
    "no-useless-return": "error",
    "no-void": "error",
    "no-warning-comments": "error",
    "no-with": "error",
    "radix": ["error", "as-needed"],
    "require-await": "error",
    "wrap-iife": "error",
    "yoda": ["error", "never"],

    /* Variables */

    "no-shadow-restricted-names": "error",
    "no-shadow": "error",
    "no-undef-init": "error",
    "no-use-before-define": "error",

    /* Node.js and CommonJS */

    "global-require": "error",
    "handle-callback-err": "error",
    "no-path-concat": "error",
    "no-process-env": "error",
    "no-sync": "error",

    /* Stylistic Issues */

    "array-bracket-spacing": ["error", "never", {
      "arraysInArrays": true,
    }],
    "block-spacing": "error",
    "brace-style": ["error", "stroustrup", { "allowSingleLine": true }],
    "camelcase": ["error", { "properties": "always" }],
    "comma-dangle": ["error", "always-multiline"],
    "comma-spacing": ["error", { "after": true, "before": false }],
    "comma-style": ["error", "last"],
    "computed-property-spacing": "error",
    "consistent-this": ["error", "self"],
    "eol-last": "error",
    "func-call-spacing": "error",
    "func-name-matching": "error",
    "func-names": ["error", "as-needed"],
    "func-style": ["error", "expression"],
    "id-length": ["error", {
      "min": 3,
      "exceptions": ["_", "fs", "cb", "i"],
    }],
    "indent": ["error", 2, { "SwitchCase": 1 }],
    "key-spacing": ["error", { "beforeColon": false, "afterColon": true }],
    "keyword-spacing": "error",
    "linebreak-style": ["error", "unix"],
    "lines-around-comment": ["error", { "beforeLineComment": true }],
    "max-len": ["error", 80],
    "max-lines": ["error", 1000],
    "new-cap": "error",
    "new-parens": "error",
    "newline-after-var": ["error", "always"],
    "newline-before-return": "error",
    "no-array-constructor": "error",
    "no-lonely-if": "error",
    "no-mixed-spaces-and-tabs": "error",
    "no-multiple-empty-lines": "error",
    "no-nested-ternary": "error",
    "no-new-object": "error",
    "no-trailing-spaces": "error",
    "no-unneeded-ternary": "error",
    "no-whitespace-before-property": "error",
    "object-curly-spacing": ["error", "always"],
    "one-var": ["error", { "uninitialized": "always", "initialized": "never" }],
    "operator-linebreak": "error",
    "quote-props": ["error", "consistent-as-needed"],
    "quotes": ["error", "single", { "avoidEscape": true }],
    "semi": ["error", "always"],
    "semi-spacing": ["error", { "before": false, "after": true }],
    "space-before-blocks": ["error", "always"],
    "space-before-function-paren": ["error", "never"],
    "space-in-parens": ["error", "never"],
    "space-infix-ops": "error",
    "space-unary-ops": ["error", { "words": false, "nonwords": false }],
    "spaced-comment": ["error", "always"],

    /* ECMAScript 6 */

    "arrow-body-style": ["error", "as-needed"],
    "arrow-parens": "error",
    "arrow-spacing": "error",
    "generator-star-spacing": "error",
    "no-confusing-arrow": ["error", { "allowParens": true }],
    "no-useless-computed-key": "error",
    "no-useless-constructor": "error",
    "no-useless-rename": "error",
    "no-var": "error",
    "object-shorthand": "error",
    "prefer-arrow-callback": "error",
    "prefer-const": "error",
    "prefer-numeric-literals": "error",
    "prefer-rest-params": "error",
    "prefer-spread": "error",
    "prefer-template": "error",
    "rest-spread-spacing": "error",
    "symbol-description": "error",
    "template-curly-spacing": "error",
    "yield-star-spacing": "error",

    /* Flow */

    "flowtype/boolean-style": ["error", "bool"],
    "flowtype/define-flow-type": "error",
    "flowtype/delimiter-dangle": ["error", "always-multiline"],
    "flowtype/generic-spacing": ["error", "never"],
    "flowtype/no-dupe-keys": "error",
    "flowtype/no-primitive-constructor-types": "error",
    "flowtype/no-weak-types": ["error", {"any": false}],
    "flowtype/object-type-delimiter": ["error", "comma"],
    "flowtype/require-parameter-type": ["error", { "excludeArrowFunctions": "expressionsOnly", "excludeParameterMatch": "^_" }],
    "flowtype/require-return-type": ["error", "always", { "excludeArrowFunctions": "expressionsOnly" }],
    "flowtype/require-valid-file-annotation": ["error", "always", {"annotationStyle": "block"}],
    "flowtype/semi": "error",
    "flowtype/space-after-type-colon": ["error", "always"],
    "flowtype/space-before-generic-bracket": ["error", "never"],
    "flowtype/space-before-type-colon": ["error", "never"],
    "flowtype/union-intersection-spacing": ["error", "always"],
    "flowtype/use-flow-type": "error",
  }
}