index.js

'use strict';

module.exports = {
	env: {
		browser: true,
	},

	globals: {
		_: false,
		Backbone: false,
		jQuery: false,
		JSON: false,
		wp: false,
	},

	rules: {
		// Possible Errors
		// Disallow assignment in conditional expressions
		'no-cond-assign': ['error', 'except-parens'],
		// Disallow irregular whitespace outside of strings and comments
		'no-irregular-whitespace': 'error',
		// Best Practices
		// Specify curly brace conventions for all control statements
		curly: ['error', 'all'],
		// Encourages use of dot notation whenever possible
		'dot-notation': ['error', {
			allowKeywords: true,
			allowPattern: '^[a-z]+(_[a-z]+)+$',
		}],
		// Disallow use of multiline strings
		'no-multi-str': 'error',
		// Disallow use of the with statement
		'no-with': 'error',
		// Requires to declare all vars on top of their containing scope
		'vars-on-top': 'error',
		// Require immediate function invocation to be wrapped in parentheses
		'wrap-iife': 'error',
		// Require or disallow Yoda conditions
		yoda: ['error', 'always'],
		// Strict Mode
		// Variables
		// Stylistic Issues
		// Enforce spacing inside array brackets
		'array-bracket-spacing': ['error', 'always'],
		// Enforce one true brace style
		'brace-style': 'error',
		// Require camel case names
		camelcase: ['error', {
			properties: 'always',
		}],
		// Disallow or enforce trailing commas
		'comma-dangle': ['error', 'never'],
		// Enforce spacing before and after comma
		'comma-spacing': 'error',
		// Enforce one true comma style
		'comma-style': ['error', 'last'],
		// Enforce newline at the end of file, with no multiple empty lines
		'eol-last': 'error',
		// Enforces spacing between keys and values in object literal properties
		'key-spacing': ['error', {
			beforeColon: false,
			afterColon: true,
		}],
		// Enforce spacing before and after keywords
		'keyword-spacing': 'error',
		// Disallow mixed "LF" and "CRLF" as linebreaks
		'linebreak-style': ['error', 'unix'],
		// Enforces empty lines around comments
		'lines-around-comment': ['error', {
			beforeLineComment: true,
		}],
		// Disallow mixed spaces and tabs for indentation
		'no-mixed-spaces-and-tabs': 'error',
		// Disallow multiple empty lines
		'no-multiple-empty-lines': 'error',
		// Disallow trailing whitespace at the end of lines
		'no-trailing-spaces': 'error',
		// Require or disallow an newline around variable declarations
		'one-var-declaration-per-line': ['error', 'initializations'],
		// Enforce operators to be placed before or after line breaks
		'operator-linebreak': ['error', 'after'],
		// Specify whether backticks, double or single quotes should be used
		quotes: ['error', 'single'],
		// Require or disallow use of semicolons instead of ASI
		semi: ['error', 'always'],
		// Require or disallow space before blocks
		'space-before-blocks': ['error', 'always'],
		// Require or disallow space before function opening parenthesis
		'space-before-function-paren': ['error', 'never'],
		// Require or disallow space before blocks
		'space-in-parens': ['error', 'always', {exceptions: ['empty']}],
		// Require spaces around operators
		'space-infix-ops': 'error',
		// Require or disallow spaces before/after unary operators (words on by default, nonwords)
		'space-unary-ops': ['error', {
			overrides: {'!': true},
		}],
		// Legacy
	},
};