.eslintrc

{
	"extends": "airbnb",
	"parser": "babel-eslint",
	"plugins": [
		"babel"
	],
	"rules": {
		// Tabs, just because
		"indent": [2, "tab"],

		// Semi colons will not save you from ASI!
		"semi": [2, "never"],

		// Allow var
		"no-var": 0,

		// Allow vars wherever (I know how hoisting works)
		"vars-on-top": 0,

		// Allow multiple var/let/const declarations in a function/block
		"one-var": 0,

		// Allow == (I know how coersion works)
		"eqeqeq": 0,

		// Enforce else on next line
		"brace-style": [2, "stroustrup", {"allowSingleLine": true}],

		// Allow returning in an else, stupid rule, would rather ENFORCE it not block it!
		"no-else-return": 0,

		// No using variables before defined; functions are exempt
		"no-use-before-define": [2, "nofunc"],

		// Turn off checking of commas at the end of arrays/objects
		"comma-dangle": 0,

		// Disable checking of spacing within object curly braces
		"object-curly-spacing": 0,

		// Enforce + at end of line (instead of start) when breaking over multiple lines
		"operator-linebreak": [2, "after"],

		// No more than 5 nested callbacks
		"max-nested-callbacks": [2, 5],

		// Enforce using `setState()` to mutate state
		"react/no-direct-mutation-state": 2,

		// Sorting of methods in component classes (
		// Same as AirBnB config, except I prefer sub-render methods after main render
		"react/sort-comp": [1, {
			"order": [
				"static-methods",
				"lifecycle",
				"/^on.+$/",
				"/^(get|set)(?!(InitialState$|DefaultProps$|ChildContext$)).+$/",
				"everything-else",
				"render",
				"/^render.+$/"
			],
			"groups": {
				"rendering": [
					"render",
					"/^render.+$/"
				]
			}
		}]
	},
	"env": {
		"browser": true,
		"node": true,
	},
}

README.md

eslint config

My preferred eslint config

Setup

1. Set up eslint: npm install --save-dev eslint eslint-config-airbnb eslint-plugin-react
2. Paste "lint": "eslint src test; exit 0" into package.json scripts (exit 0; prevents failures creating npm debug files)

Note: If React plugin is not required, change the "extends": "airbnb" to "extends": "airbnb/base"