.eslintrc.js

module.exports = {
	env: {
		browser: true,
		es6: true
	},
	extends: [
		'plugin:react/recommended',
		'standard'
	],
	globals: {
		Atomics: 'readonly',
		SharedArrayBuffer: 'readonly'
	},
	parserOptions: {
		ecmaFeatures: {
			jsx: true
		},
		ecmaVersion: 2018,
		sourceType: 'module'
	},
	plugins: [
		'react'
	],
	rules: {
		"accessor-pairs": "error",
		"array-bracket-spacing": [
			"error",
			"never"
		],
		"array-callback-return": "error",
		"arrow-body-style": "off",
		"arrow-parens": "off",
		"arrow-spacing": "off",
		"block-scoped-var": "error",
		"block-spacing": "off",
		"brace-style": "off",
		"callback-return": "off",
		"camelcase": "off",
		"class-methods-use-this": "off",
		"comma-dangle": [
			"error",
			"only-multiline"
		],
		"comma-spacing": "off",
		"comma-style": "off",
		"complexity": "off",
		"computed-property-spacing": [
			"error",
			"never"
		],
		"consistent-return": "error",
		"consistent-this": "off",
		"curly": ["error", "multi-line", "consistent"],
		"default-case": "off",
		"dot-location": [
			"error",
			"property"
		],
		"dot-notation": "off", // I like dot notation but it's probably not worth warninining about
		"eol-last": "off",
		"eqeqeq": "off", // not a bad idea, but there's too many...
		"func-call-spacing": "error",
		"func-names": "off",
		"func-style": "off",
		"generator-star-spacing": ["error", {"before": false, "after": true}], // MDN puts the * immediately after `function`: https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Statements/function*
		"global-require": "off",
		"guard-for-in": "warn",
		"handle-callback-err": ["error", "^([Ee]rr(or)?([^a-z].*)?|.*(.E|[^a-z]e)rr(or)?)$"],
		"id-blacklist": "off",
		"id-length": "off",
		"id-match": "off",
		"indent": ["error", "tab"],
		"init-declarations": "off",
		"jsx-quotes": ["error", "prefer-double"],
		"key-spacing": "error", // https://github.com/eslint/eslint/issues/7318
		"keyword-spacing": ["error", {
			"overrides": {
				"if": {"after": false},
				"for": {"after": false},
				"while": {"after": false},
				"switch": {"after": false},
				"catch": {"after": false},
			}
		}],
		"linebreak-style": ["error", "unix"],
		"lines-around-comment": "off",
		"max-depth": "off",
		"max-len": "off",
		"max-lines": "off",
		"max-nested-callbacks": "error",
		"max-params": "off",
		"max-statements": "off",
		"max-statements-per-line": "off",
		"multiline-ternary": "off",
		"new-parens": "off",
		"newline-after-var": "off",
		"newline-before-return": "off",
		"newline-per-chained-call": ["error", {"ignoreChainWithDepth": 5}],
		"no-alert": "warn",
		"no-array-constructor": "error",
		"no-bitwise": "off",
		"no-caller": "error",
		"no-catch-shadow": "off",
		"no-confusing-arrow": ["off", {"allowParens": true}],
		"no-constant-condition": [
			"error",
			{
				"checkLoops": true
			}
		],
		"no-continue": "warn",
		"no-div-regex": "off",
		"no-duplicate-imports": ["error", {"includeExports": true}],
		"no-else-return": "off", // sometimes the elses add clarity I think
		"no-empty-function": "off",
		"no-eq-null": "off",
		"no-eval": "error",
		"no-extend-native": "error",
		"no-extra-bind": "error",
		"no-extra-label": "error",
		"no-extra-parens": "off",
		"no-floating-decimal": "off",
		"no-global-assign": "error",
		"no-implicit-coercion": "off",
		"no-implicit-globals": "error",
		"no-implied-eval": "error",
		"no-inline-comments": "off",
		"no-invalid-this": "off", // would be nice, but jQuery uses `this` excessively
		"no-iterator": "error",
		"no-label-var": "error",
		"no-labels": "error",
		"no-lone-blocks": "error",
		"no-lonely-if": "warn",
		"no-loop-func": "error",
		"no-magic-numbers": "off",
		"no-mixed-operators": [
			"error",
			{
				"groups": [
					// ["+", "-", "*", "/", "%", "**"], // order of operations on math operators is pretty well understood, no need to flag these as an error
					["&", "|", "^", "~", "<<", ">>", ">>>"],
					["==", "!=", "===", "!==", ">", ">=", "<", "<="],
					["&&", "||"],
					["in", "instanceof"]
				],
				"allowSamePrecedence": true
			}
		],
		"no-mixed-requires": "error",
		"no-multi-spaces": ["error", {
			"ignoreEOLComments": true,
		}],
		"no-multi-str": "off",
		"no-multiple-empty-lines": ["warn", {"max": 2}],
		"no-negated-condition": "off", // hrmmm...
		"no-nested-ternary": "off", // too hard to avoid ternaries in react
		"no-new": "error",
		"no-new-func": "error",
		"no-new-object": "error",
		"no-new-require": "error",
		"no-new-wrappers": "error",
		"no-octal-escape": "error",
		"no-param-reassign": "off", // hrmm...
		"no-path-concat": "warn",
		"no-plusplus": "off",
		"no-process-env": "off",
		"no-process-exit": "error",
		"no-proto": "error",
		"no-prototype-builtins": "warn",
		"no-restricted-globals": "error",
		"no-restricted-imports": "error",
		"no-restricted-modules": "error",
		"no-restricted-syntax": "error",
		"no-return-assign": [
			"error",
			"always"
		],
		"no-script-url": "error",
		"no-self-compare": "error",
		"no-sequences": "warn",
		"no-shadow": "warn",
		"no-shadow-restricted-names": "error",
		"no-sync": "warn",
		"no-template-curly-in-string": "warn",
		"no-ternary": "off",
		"no-throw-literal": "error",
		"no-trailing-spaces": "off",
		"no-undef-init": "off",
		"no-undefined": "off",
		"no-underscore-dangle": "off",
		"no-unmodified-loop-condition": "error",
		"no-unneeded-ternary": "error",
		"no-unsafe-negation": "error",
		"no-unused-expressions": "error",
		"no-unused-vars": ["warn", {
			argsIgnorePattern: "^_", // http://eslint.org/docs/rules/no-unused-vars#argsignorepattern
			args: "none",
			caughtErrorsIgnorePattern: "^_",
			ignoreRestSiblings: true,
		}],
		"no-use-before-define": ["error", "nofunc"],
		"no-useless-call": "error",
		"no-useless-computed-key": "error",
		"no-useless-concat": "error",
		"no-useless-constructor": "error",
		"no-useless-escape": "warn",
		"no-useless-rename": "error",
		"no-var": "warn",
		"no-void": "error",
		"no-warning-comments": "off",
		"no-whitespace-before-property": "error",
		"no-with": "error",
		"object-curly-newline": "off", // couldn't get this to behave the way I wanted
		"object-curly-spacing": "off",
		"object-property-newline": ["error", {"allowMultiplePropertiesPerLine": true}],
		"object-shorthand": "off",
		"one-var": "off",
		"one-var-declaration-per-line": ["error", "initializations"],
		"operator-assignment": "off",
		"operator-linebreak": ["warn", "before", {"overrides": {"?": "ignore", ":": "ignore", "&&": "ignore"}}], // { "overrides": { "?": "ignore", ":": "ignore" } }
		"padded-blocks": "off",
		"prefer-arrow-callback": "off",
		"prefer-const": "off",
		"prefer-reflect": "off",
		"prefer-rest-params": "off", // rest params are nice, but not necessary
		"prefer-spread": "warn",
		"prefer-template": "off",
		"quote-props": ["error", "consistent"],
		"quotes": "off",
		"radix": "off",
		"require-jsdoc": "off", // there's too many
		// "require-jsdoc": ["warn", {
		//     "require": {
		//         "FunctionDeclaration": true,
		//         "MethodDefinition": false,
		//         "ClassDeclaration": false
		//     }
		// }],
		"rest-spread-spacing": [
			"error",
			"never"
		],
		"semi": [2, "always"],
		"semi-spacing": "off",
		"sort-imports": "off",
		"sort-keys": "off",
		"sort-vars": "off",
		"space-before-blocks": "off",
		"space-before-function-paren": "off",
		"space-in-parens": "off",
		"space-infix-ops": "off",
		"space-unary-ops": [
			"error",
			{
				"words": false,
				"nonwords": false
			}
		],
		"spaced-comment": "off",
		"strict": "off",
		"symbol-description": "error",
		"template-curly-spacing": [
			"error",
			"never"
		],
		"unicode-bom": [
			"error",
			"never"
		],
		"valid-jsdoc": ["warn", {
			"requireReturn": false,
			"requireReturnType": true,
			"requireParamDescription": false,
			"requireReturnDescription": false,
			// "matchDescription": "[A-Za-z]"
		}],
		"vars-on-top": "warn",
		"wrap-iife": "off",
		"wrap-regex": "off",
		"yield-star-spacing": ["error", "after"],
		"yoda": ["warn", "never"],
		"no-console": ["off", {allow: ["warn", "error"]}], // disabled because they'll be stripped anyway
		"no-dupe-keys": "error",
		"react/react-in-jsx-scope": "off", // webpack will auto-import React as needed (ProvidePlugin)
		"react/jsx-no-duplicate-props": "error",
		"react/jsx-no-undef": "error",
		"react/prop-types": "off", // disabled because it doesn't work with createComponent
		"react/display-name": "off", // also doesn't work with createComponent
		"react/forbid-prop-types": "off",
		"react/no-children-prop": "off",
		"react/no-unescaped-entities": ["error", {"forbid": [">", "}"]}],
		"react/no-string-refs": "warn", // this actually *should* be an error, but I don't have time to fix all of these right now
		"no-control-regex": "off", // this rule is just stupid. if i put a control character in my regex, it most likely *is* intentional
		"react/no-deprecated": "off", // componentWillMount() and such have been deprecated. we do not have time to rewrite all our components right now.
		"react/jsx-no-target-blank": "off", // neat warning, but we like to mess with window.opener, so this is a no-go.
		"no-tabs": ["error", {allowIndentationTabs: true}]
	}
};