.eslintrc.json

/*
 * Eko's ESLint JSON Config file (eslint allows JavaScript-style comments in JSON config files).
 */

 {
    // Enable the ESLint recommended rules as a starting point.
    // These are rules that report common problems, see https://eslint.org/docs/rules/
    "extends": "eslint:recommended",

    // Specify the envs (an environment defines global variables that are predefined).
    // See https://eslint.org/docs/user-guide/configuring#specifying-environments
    "env": {
        // Browser global variables.
        "browser": true,

        // Node.js global variables and Node.js scoping.
        "node": true,

        // CommonJS global variables and CommonJS scoping (use this for browser-only code that uses Browserify/WebPack).
        "commonjs": true,

        // Globals common to both Node.js and Browser.
        "shared-node-browser": true,

        // enable all ECMAScript 6 features except for modules (this automatically sets the ecmaVersion parser option to 6).
        "es6": true,

        // web workers global variables.
        "worker": true
    },

    // https://eslint.org/docs/rules
    "rules": {

        ///////////////////////////////////////////////////////////////////////////////////
        // Possible Errors          https://eslint.org/docs/rules/#possible-errors
        ///////////////////////////////////////////////////////////////////////////////////

        // https://eslint.org/docs/rules/no-console
        "no-console": ["error", { "allow": ["error"] }],

        // https://eslint.org/docs/rules/no-empty
        "no-empty": ["error", { "allowEmptyCatch": true }],

        // https://eslint.org/docs/rules/valid-jsdoc
        // TODO - valid-jsdoc

        ///////////////////////////////////////////////////////////////////////////////////
        // Best Practices           https://eslint.org/docs/rules/#best-practices
        ///////////////////////////////////////////////////////////////////////////////////

        // https://eslint.org/docs/rules/accessor-pairs
        "accessor-pairs": "error",

        // https://eslint.org/docs/rules/array-callback-return
        "array-callback-return": ["error", { "allowImplicit": true }],

        // https://eslint.org/docs/rules/block-scoped-var
        "block-scoped-var": "error",

        // https://eslint.org/docs/rules/curly
        "curly": ["error", "all"],

        // https://eslint.org/docs/rules/default-case
        "default-case": "error",

        // https://eslint.org/docs/rules/dot-location
        "dot-location": ["error", "property"],

        // https://eslint.org/docs/rules/dot-notation
        "dot-notation": "error",

        // https://eslint.org/docs/rules/eqeqeq
        "eqeqeq": ["error", "always"],

        // https://eslint.org/docs/rules/no-alert
        "no-alert": "error",

        // https://eslint.org/docs/rules/no-caller
        "no-caller": "error",

        // https://eslint.org/docs/rules/no-else-return
        "no-else-return": ["error", { "allowElseIf": false }],

        // https://eslint.org/docs/rules/no-eq-null
        "no-eq-null": "error",

        // https://eslint.org/docs/rules/no-eval
        "no-eval": "error",

        // https://eslint.org/docs/rules/no-extra-bind
        "no-extra-bind": "error",

        // https://eslint.org/docs/rules/no-fallthrough
        "no-fallthrough": ["error", { "commentPattern": "fall-?thr(ough|u)" }],

        // https://eslint.org/docs/rules/no-floating-decimal
        "no-floating-decimal": "error",

        // https://eslint.org/docs/rules/no-implicit-coercion
        "no-implicit-coercion": ["error", { "allow": ["!!"] }],

        // https://eslint.org/docs/rules/no-implicit-globals
        "no-implicit-globals": "error",

        // https://eslint.org/docs/rules/no-implied-eval
        "no-implied-eval": "error",

        // https://eslint.org/docs/rules/no-invalid-this
        "no-invalid-this": "error",

        // https://eslint.org/docs/rules/no-iterator
        "no-iterator": "error",

        // https://eslint.org/docs/rules/no-labels
        "no-labels": "error",

        // https://eslint.org/docs/rules/no-lone-blocks
        "no-lone-blocks": "error",

        // https://eslint.org/docs/rules/no-loop-func
        "no-loop-func": "error",

        // https://eslint.org/docs/rules/no-magic-numbers
        "no-magic-numbers": ["error", {
            "ignore": [
                0, 1, -1,
                10, 100, 1000, 10000, 100000, 1000000, 10000000, 100000000,
                2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048,
                24, 60,
                0.5, 0.25, 1.5
            ]
        }],

        // https://eslint.org/docs/rules/no-multi-spaces
        "no-multi-spaces": ["error", { "ignoreEOLComments": true, "exceptions": {
            "Property": true,
            "VariableDeclarator": true,
            "ImportDeclaration": true
        }}],

        // https://eslint.org/docs/rules/no-multi-str
        "no-multi-str": "error",

        // https://eslint.org/docs/rules/no-new
        "no-new": "error",

        // https://eslint.org/docs/rules/no-new-wrappers
        "no-new-wrappers": "error",

        // https://eslint.org/docs/rules/no-octal-escape
        "no-octal-escape": "error",

        // https://eslint.org/docs/rules/no-proto
        "no-proto": "error",

        // https://eslint.org/docs/rules/no-return-assign
        "no-return-assign": "error",

        // https://eslint.org/docs/rules/no-return-await
        "no-return-await": "error",

        // https://eslint.org/docs/rules/no-script-url
        "no-script-url": "error",

        // https://eslint.org/docs/rules/no-self-compare
        "no-self-compare": "error",

        // https://eslint.org/docs/rules/no-sequences
        "no-sequences": "error",

        // https://eslint.org/docs/rules/no-throw-literal
        "no-throw-literal": "error",

        // https://eslint.org/docs/rules/no-unmodified-loop-condition
        "no-unmodified-loop-condition": "error",

        // https://eslint.org/docs/rules/no-unused-expressions
        "no-unused-expressions": "error",

        // https://eslint.org/docs/rules/no-useless-call
        "no-useless-call": "error",

        // https://eslint.org/docs/rules/no-useless-concat
        "no-useless-concat": "error",

        // https://eslint.org/docs/rules/no-useless-return
        "no-useless-return": "error",

        // https://eslint.org/docs/rules/no-void
        "no-void": "error",

        // https://eslint.org/docs/rules/no-with
        "no-with": "error",

        // https://eslint.org/docs/rules/prefer-promise-reject-errors
        "prefer-promise-reject-errors": ["error", { "allowEmptyReject": true }],

        // https://eslint.org/docs/rules/radix
        "radix": ["error", "always"],

        // https://eslint.org/docs/rules/require-await
        "require-await": "error",

        // https://eslint.org/docs/rules/wrap-iife
        "wrap-iife": ["error", "any"],

        ///////////////////////////////////////////////////////////////////////////////////
        // Strict Mode              https://eslint.org/docs/rules/#strict-mode
        ///////////////////////////////////////////////////////////////////////////////////

        // https://eslint.org/docs/rules/strict
        "strict": ["error", "safe"],

        ///////////////////////////////////////////////////////////////////////////////////
        // Variables                https://eslint.org/docs/rules/#variables
        ///////////////////////////////////////////////////////////////////////////////////

        // https://eslint.org/docs/rules/no-shadow
        "no-shadow": ["error", {
            "builtinGlobals": true,
            "hoist": "functions",
            "allow": [
                "name",
                "parent",
                "event",
                "status"
            ]
        }],

        // https://eslint.org/docs/rules/no-shadow-restricted-names
        "no-shadow-restricted-names": "error",

        // https://eslint.org/docs/rules/no-undef-init
        "no-undef-init": "error",

        // https://eslint.org/docs/rules/no-use-before-define
        "no-use-before-define": ["error", { "functions": true, "classes": true, "variables": true }],

        ///////////////////////////////////////////////////////////////////////////////////
        // Node.js and CommonJS     https://eslint.org/docs/rules/#nodejs-and-commonjs
        ///////////////////////////////////////////////////////////////////////////////////

        // https://eslint.org/docs/rules/global-require
        "global-require": "error",

        // https://eslint.org/docs/rules/no-buffer-constructor
        "no-buffer-constructor": "error",

        // https://eslint.org/docs/rules/no-new-require
        "no-new-require": "error",

        // https://eslint.org/docs/rules/no-path-concat
        "no-path-concat": "error",

        ///////////////////////////////////////////////////////////////////////////////////
        // Stylistic Issues         https://eslint.org/docs/rules/#stylistic-issues
        ///////////////////////////////////////////////////////////////////////////////////

        // https://eslint.org/docs/rules/array-bracket-newline
        "array-bracket-newline": ["warn", { "multiline": true }],

        // https://eslint.org/docs/rules/array-bracket-spacing
        "array-bracket-spacing": ["warn", "never"],

        // https://eslint.org/docs/rules/block-spacing
        "block-spacing": ["warn", "always"],

        // https://eslint.org/docs/rules/brace-style
        "brace-style": ["warn", "1tbs", { "allowSingleLine": true }],

        // https://eslint.org/docs/rules/camelcase
        "camelcase": ["warn", { "properties": "always" }],

        // https://eslint.org/docs/rules/capitalized-comments
        "capitalized-comments": ["warn", "always", { "ignoreInlineComments": true, "ignoreConsecutiveComments": true }],

        // https://eslint.org/docs/rules/comma-dangle
        "comma-dangle": ["warn", "only-multiline"],

        // https://eslint.org/docs/rules/comma-spacing
        "comma-spacing": ["warn", { "before": false, "after": true }],

        // https://eslint.org/docs/rules/comma-style
        "comma-style": ["warn", "last"],

        // https://eslint.org/docs/rules/computed-property-spacing
        "computed-property-spacing": ["warn", "never"],

        // TODO - discuss with TEAM!
        // https://eslint.org/docs/rules/consistent-this
        "consistent-this": ["warn", "that", "_this", "self"],

        // https://eslint.org/docs/rules/eol-last
        "eol-last": ["warn", "always"],

        // https://eslint.org/docs/rules/func-call-spacing
        "func-call-spacing": ["warn", "never"],

        // https://eslint.org/docs/rules/func-name-matching
        "func-name-matching": ["warn", "always"],

        // https://eslint.org/docs/rules/function-paren-newline
        "function-paren-newline": ["warn", "consistent"],

        // https://eslint.org/docs/rules/implicit-arrow-linebreak
        "implicit-arrow-linebreak": ["warn", "beside"],

        // https://eslint.org/docs/rules/indent
        "indent": ["warn", 4, {
            "SwitchCase": 1,
            "FunctionDeclaration": {
                "parameters": 1,
                "body": 1
            },
            "FunctionExpression": {
                "parameters": 1,
                "body": 1
            },
            "CallExpression": {
                "arguments": 1
            },
            "ArrayExpression": 1,
            "ObjectExpression": 1,
            "ImportDeclaration": 1,
            "ignoredNodes": []
        }],

        // https://eslint.org/docs/rules/jsx-quotes
        "jsx-quotes": ["warn", "prefer-double"],

        // https://eslint.org/docs/rules/key-spacing
        "key-spacing": [
            "warn", 
            {
                "singleLine": {
                    "beforeColon": false,
                    "afterColon": true,
                    "mode": "strict"
                },
                "multiLine": {
                    "beforeColon": false,
                    "afterColon": true,
                    "mode": "minimum"
                }
            }
        ],

        // https://eslint.org/docs/rules/keyword-spacing
        "keyword-spacing": ["warn", { "before": true, "after": true }],

        // https://eslint.org/docs/rules/linebreak-style
        "linebreak-style": ["warn", "unix"],

        // https://eslint.org/docs/rules/lines-around-comment
        "lines-around-comment": ["warn", {
            "beforeBlockComment": true,
            "afterBlockComment": false,
            "beforeLineComment": true,
            "afterLineComment": false,
            "allowBlockStart": true,
            "allowBlockEnd": false,
            "allowClassStart": true,
            "allowClassEnd": false,
            "allowObjectStart": true,
            "allowObjectEnd": false,
            "allowArrayStart": true,
            "allowArrayEnd": false
        }],

        // https://eslint.org/docs/rules/max-len
        "max-len": ["warn", {
            "code": 120,
            "tabWidth": 4,
            "ignoreUrls": true,
            "ignoreComments": true
        }],

        // https://eslint.org/docs/rules/max-lines
        "max-lines": ["warn", {
            "max": 700,
            "skipBlankLines": true,
            "skipComments": true
        }],

        // https://eslint.org/docs/rules/max-statements
        "max-statements": ["warn", 30],

        // https://eslint.org/docs/rules/max-statements-per-line
        "max-statements-per-line": ["warn", {
            "max": 1
        }],

        // https://eslint.org/docs/rules/multiline-ternary
        "multiline-ternary": ["warn", "always-multiline"],

        // https://eslint.org/docs/rules/new-cap
        "new-cap": ["warn", { "newIsCap": true, "capIsNew": true, "properties": true }],

        // https://eslint.org/docs/rules/new-parens
        "new-parens": "warn",

        // https://eslint.org/docs/rules/newline-per-chained-call
        "newline-per-chained-call": ["warn", { "ignoreChainWithDepth": 2 }],

        // https://eslint.org/docs/rules/no-array-constructor
        "no-array-constructor": "warn",

        // https://eslint.org/docs/rules/no-bitwise
        "no-bitwise": "warn",

        // https://eslint.org/docs/rules/no-lonely-if
        "no-lonely-if": "warn",

        // https://eslint.org/docs/rules/no-mixed-operators
        "no-mixed-operators": "warn",

        // https://eslint.org/docs/rules/no-multi-assign
        "no-multi-assign": "warn",

        // https://eslint.org/docs/rules/no-multiple-empty-lines
        "no-multiple-empty-lines": ["warn", { "max": 2, "maxEOF": 1, "maxBOF": 0 }],

        // https://eslint.org/docs/rules/no-negated-condition
        "no-negated-condition": "warn",

        // https://eslint.org/docs/rules/no-new-object
        "no-new-object": "warn",

        // https://eslint.org/docs/rules/no-tabs
        "no-tabs": "warn",

        // https://eslint.org/docs/rules/no-trailing-spaces
        "no-trailing-spaces": ["warn", { "skipBlankLines": false, "ignoreComments": false }],

        // https://eslint.org/docs/rules/no-unneeded-ternary
        "no-unneeded-ternary": ["warn", { "defaultAssignment": false }],

        // https://eslint.org/docs/rules/no-whitespace-before-property
        "no-whitespace-before-property": "warn",

        // https://eslint.org/docs/rules/object-curly-newline
        "object-curly-newline": ["warn", { "consistent": true }],

        // https://eslint.org/docs/rules/object-curly-spacing
        "object-curly-spacing": ["warn", "always"],

        // https://eslint.org/docs/rules/one-var
        "one-var": ["error", "never"],

        // https://eslint.org/docs/rules/operator-linebreak
        "operator-linebreak": ["warn", "after"],

        // https://eslint.org/docs/rules/padded-blocks
        "padded-blocks": ["warn", "never"],

        // https://eslint.org/docs/rules/quote-props
        "quote-props": ["warn", "as-needed"],

        // https://eslint.org/docs/rules/quotes
        "quotes": ["warn", "single", { "avoidEscape": true, "allowTemplateLiterals": true }],

        // https://eslint.org/docs/rules/semi
        "semi": ["warn", "always"],

        // https://eslint.org/docs/rules/semi-spacing
        "semi-spacing": ["warn", { "before": false, "after": true }],

        // https://eslint.org/docs/rules/semi-style
        "semi-style": ["warn", "last"],

        // https://eslint.org/docs/rules/space-before-blocks
        "space-before-blocks": ["warn", "always"],

        // https://eslint.org/docs/rules/space-before-function-paren
        "space-before-function-paren": ["warn", { 
            "anonymous": "never",
            "named": "never",
            "asyncArrow": "always"
         }],

        // https://eslint.org/docs/rules/space-in-parens
        "space-in-parens": ["warn", "never"],

        // https://eslint.org/docs/rules/space-infix-ops
        "space-infix-ops": "warn",

        // https://eslint.org/docs/rules/space-unary-ops
        "space-unary-ops": ["warn", { "words": true, "nonwords": false }],

        // https://eslint.org/docs/rules/spaced-comment
        "spaced-comment": ["warn", "always", { "exceptions": ["-", "/", "=", "*"] }],

        // https://eslint.org/docs/rules/switch-colon-spacing
        "switch-colon-spacing": ["warn", { "after": true, "before": false }],

        // https://eslint.org/docs/rules/unicode-bom
        "unicode-bom": ["error", "never"],

        ///////////////////////////////////////////////////////////////////////////////////
        // ECMAScript 6             https://eslint.org/docs/rules/#ecmascript-6
        ///////////////////////////////////////////////////////////////////////////////////

        // https://eslint.org/docs/rules/arrow-spacing
        "arrow-spacing": ["warn", { "before": true, "after": true }],

        // https://eslint.org/docs/rules/no-duplicate-imports
        "no-duplicate-imports": ["error", { "includeExports": true }],

        // https://eslint.org/docs/rules/no-useless-computed-key
        "no-useless-computed-key": "error",

        // https://eslint.org/docs/rules/no-useless-constructor
        "no-useless-constructor": "error",

        // https://eslint.org/docs/rules/no-useless-rename
        "no-useless-rename": ["error", {
            "ignoreImport": false,
            "ignoreExport": false,
            "ignoreDestructuring": false
        }],

        // https://eslint.org/docs/rules/rest-spread-spacing
        "rest-spread-spacing": ["warn", "never"],

        // https://eslint.org/docs/rules/template-curly-spacing
        "template-curly-spacing": ["warn", "never"]

        // TODO - more ES6 rules
    }
}