.eslintrc.json

{
  "parserOptions": {
    "ecmaVersion": 6,
    "sourceType": "module",
    "ecmaFeatures": { "jsx": true}
  },
  "env": {
    "browser": true,
    "node": true,
    "jquery": true,
    "es6": true
  },
  "globals": {
    "$": true,
    "router": true,
    "express": true,
    "appRootDirectory": true,
    "req": true,
    "next": true,
    "res": true,
    "govuk": true,
    "logger": true,
    "config": true,
    "gulpPaths" : true
  },
  "rules": {
    "strict": [2, "global" ],
    "init-declarations": 0,
    "no-catch-shadow": 0,
    "no-delete-var": 1,
    "no-label-var": 2,
    "no-shadow-restricted-names": 2,
    "no-shadow": [ 2, { "builtinGlobals": false, "hoist": "all" }],
    "no-undef-init": 1,
    "no-undef": 2,
    "no-undefined": 2,
    "no-unused-vars": [1, { "vars": "all", "args": "after-used"}],
    "no-use-before-define": 1,
    "comma-dangle": [2, "never"],
    "no-cond-assign": [2, "except-parens"],
    "no-console": 1,
    "no-constant-condition": 2,
    "no-control-regex": 2,
    "no-debugger": 2,
    "no-dupe-args": 2,
    "no-dupe-keys": 2,
    "no-duplicate-case": 2,
    "no-empty-character-class": 2,
    "no-empty": 2,
    "no-ex-assign": 2,
    "no-extra-boolean-cast": 2,
    "no-extra-parens": [0, "all"],
    "no-extra-semi": 1,
    "no-func-assign": 2,
    "no-inner-declarations": [2, "both"],
    "no-invalid-regexp": 2,
    "no-irregular-whitespace": [2, { "skipRegExps": true }],
    "no-negated-in-lhs": 2,
    "no-obj-calls": 2,
    "no-regex-spaces": 2,
    "no-sparse-arrays": 2,
    "no-unreachable": 2,
    "use-isnan": 2,
    "valid-jsdoc": 0,
    "valid-typeof": 2,
    "no-unexpected-multiline": 2,
    "accessor-pairs": [2, { "getWithoutSet": false, "setWithoutGet": true}],
    "block-scoped-var": 2,
    "complexity": [1, 10],
    "consistent-return": 2,
    "curly": [2, "all"],
    "default-case": 2,
    "dot-notation": [ 2, { "allowKeywords": true, "allowPattern": ""}],
    "dot-location": [2, "property"],
    "eqeqeq": 2,
    "guard-for-in": 2,
    "no-alert": 1,
    "no-caller": 2,
    "no-div-regex": 2,
    "no-else-return": 0,
    "no-eq-null": 2,
    "no-eval": 2,
    "no-extend-native": 2,
    "no-extra-bind": 2,
    "no-fallthrough": 1,
    "no-floating-decimal": 1,
    "no-implicit-coercion": [1, { "boolean": false, "number": true, "string": false}],
    "no-implied-eval": 2,
    "no-invalid-this": 0,
    "no-iterator": 2,
    "no-labels": 2,
    "no-lone-blocks": 2,
    "no-loop-func": 2,
    "no-multi-spaces": [1, { "exceptions": { "VariableDeclarator": true, "ImportDeclaration": true, "AssignmentExpression": true, "ObjectExpression": true }}],
    "no-multi-str": 2,
    "no-native-reassign": 2,
    "no-new-func": 2,
    "no-new-wrappers": 2,
    "no-new": 2,
    "no-octal-escape": 2,
    "no-octal": 2,
    "no-param-reassign": 0,
    "no-process-env": 1,
    "no-proto": 2,
    "no-redeclare": [ 2, { "builtinGlobals": true}],
    "no-return-assign": [2, "except-parens"],
    "no-script-url": 2,
    "no-self-compare": 0,
    "no-sequences": 2,
    "no-throw-literal": 2,
    "no-unused-expressions": 2,
    "no-useless-call": 1,
    "no-useless-concat": 2,
    "no-void": 2,
    "no-warning-comments": [0, { "terms": [ "todo", "fixme"], "location": "start"}],
    "no-with": 2,
    "radix": 1,
    "vars-on-top": 1,
    "wrap-iife": [2, "inside"],
    "yoda": [1, "never"],
    "array-bracket-spacing": [2, "never"],
    "block-spacing": [1, "always"],
    "brace-style": [2, "1tbs"],
    "camelcase": [1, { "properties": "always"}],
    "comma-spacing": [1, { "before": false,  "after": true}],
    "comma-style": [1, "last"],
    "computed-property-spacing": [2, "never"],
    "consistent-this": [1, "self"],
    "eol-last": 1,
    "func-names": 2,
    "func-style": 0,
    "id-length": 0,
    "id-match": 0,
    "indent": [1, 4],
    "jsx-quotes": [1, "prefer-single"],
    "key-spacing": [1, { "beforeColon": true, "afterColon": true, "mode": "minimum"}],
    "keyword-spacing": [2, {"before": true, "after": true}],
    "lines-around-comment": 0,
    "linebreak-style": 0,
    "max-nested-callbacks": [1, 3],
    "new-cap": [1, { "newIsCap": true, "capIsNew": true}],
    "new-parens": 1,
    "newline-after-var": [0, "always"],
    "no-array-constructor": 1,
    "no-continue": 1,
    "no-inline-comments": 0,
    "no-lonely-if": 1,
    "no-mixed-spaces-and-tabs": 2,
    "no-multiple-empty-lines": [1, { "max": 1}],
    "no-nested-ternary": 1,
    "no-new-object": 1,
    "no-restricted-syntax": 0,
    "no-spaced-func": 1,
    "no-ternary": 0,
    "no-trailing-spaces": [1, { "skipBlankLines": false}],
    "no-underscore-dangle": 0,
    "no-unneeded-ternary": [1, { "defaultAssignment": true}],
    "object-curly-spacing": [1, "never"],
    "one-var": [0, "never"],
    "operator-assignment": 0,
    "operator-linebreak": [1, "after"],
    "padded-blocks": [1, "never"],
    "quote-props": [1, "as-needed", { "keywords": false, "unnecessary": false, "numbers": true}],
    "quotes": [2, "single", "avoid-escape"],
    "require-jsdoc": 0,
    "semi-spacing": [1, { "before": false, "after": true}],
    "semi": [1, "always"],
    "sort-vars": 0,
    "space-before-blocks": [1, "always"],
    "space-before-function-paren": [1, { "anonymous": "never", "named": "never"}],
    "space-in-parens": [1, "never"],
    "space-infix-ops": [1, { "int32Hint": false}],
    "space-unary-ops": [1, { "words": true, "nonwords": false}],
    "wrap-regex": 2,
    /*
    **  ECMASCRIPT 6
    **  These rules are only relevant to ES6 environments.
    */
    "arrow-parens": [2, "always"],
    "arrow-spacing": [2, { "before": true, "after": true}],
    "constructor-super": 2,
    "generator-star-spacing": [2, { "before": false, "after": true}],
    "no-class-assign": 2,
    "no-const-assign": 2,
    "no-dupe-class-members": 0,
    "no-this-before-super": 2,
    "no-var": 0,
    "object-shorthand": 0,
    "prefer-arrow-callback": 0,
    "prefer-const": 1,
    "prefer-spread": 0,
    "prefer-reflect": 0,
    "prefer-template": 0,
    "require-yield": 2,
    /*
    **  NODE.JS AND COMMONJS
    **  These rules are specific to JavaScript running on Node.js or
    **  using CommonJS in the browser.
    */
    "callback-return": 1,
    "global-require": 0,
    "handle-callback-err": 1,
    "no-mixed-requires": 1,
    "no-new-require": 1,
    "no-path-concat": 1,
    "no-process-exit": 1,
    "no-restricted-modules": 1,
    "no-sync": 0
  }
}