eslint-config-aftership/rules/variables.js

AfterShip ESLint config (modified from Airbnb)

'use strict';

const eslintRestrictedGlobals = require('eslint-restricted-globals');
const allows = ['name', 'history', 'status', 'location', 'event'];
const restrictedGlobals = eslintRestrictedGlobals.filter(g => !allows.includes(g));

module.exports = {
	rules: {
		// enforce or disallow variable initializations at definition
		'init-declarations': 'off',

		// disallow the catch clause parameter name being the same as a variable in the outer scope
		'no-catch-shadow': 'off',

		// disallow deletion of variables
		'no-delete-var': 'error',

		// disallow labels that share a name with a variable
		// http://eslint.org/docs/rules/no-label-var
		'no-label-var': 'error',

		// disallow specific globals
		'no-restricted-globals': ['error'].concat(restrictedGlobals),

		// disallow declaration of variables already declared in the outer scope
		'no-shadow': ['error', {
			builtinGlobals: true,
			allow: allows,
		}],

		// disallow shadowing of names such as arguments
		'no-shadow-restricted-names': 'error',

		// disallow use of undeclared variables unless mentioned in a /*global */ block
		'no-undef': 'error',

		// disallow use of undefined when initializing variables
		'no-undef-init': 'error',

		// disallow use of undefined variable
		// http://eslint.org/docs/rules/no-undefined
		// TODO: enable?
		'no-undefined': 'off',

		// disallow declaration of variables that are not used in the code
		'no-unused-vars': ['error', {
			vars: 'all',
			args: 'after-used',
			ignoreRestSiblings: true,
			'argsIgnorePattern': '^_.+',
		}],

		// disallow use of variables before they are defined
		// but enable function hoist
		'no-use-before-define': ['error', {
			functions: false,
			classes: true,
			variables: true,
		}],
	},
};