.eslintrc.js

module.exports = {
	root: true,
	parserOptions: {
		sourceType: 'module'
	},
	env: {
		browser: true,
		mocha: true,
		node: true
	},
	rules: {
		'array-bracket-spacing': [ 1, 'always' ],
		'brace-style': [ 1, '1tbs' ],
		// REST API objects include underscores
		camelcase: 0,
		'comma-spacing': 1,
		curly: 1,
		'dot-notation': 1,
		'computed-property-spacing': [ 1, 'always' ],
		indent: [ 1, 'tab', { SwitchCase: 1 } ],
		'jsx-quotes': [ 1, 'prefer-double' ],
		'key-spacing': 1,
		'keyword-spacing': 1,
		'max-len': [ 1, { code: 140 } ],
		'new-cap': [ 1, { capIsNew: false, newIsCap: true } ],
		'no-console': 1,
		'no-else-return': 1,
		'no-extra-semi': 1,
		'no-lonely-if': 1,
		'no-multiple-empty-lines': [ 1, { max: 1 } ],
		'no-multi-spaces': 1,
		'no-nested-ternary': 1,
		'no-new': 1,
		'no-process-exit': 1,
		'no-shadow': 1,
		'no-spaced-func': 1,
		'no-trailing-spaces': 1,
		// Allows Chai `expect` expressions
		'no-unused-expressions': 0,
		'no-var': 1,
		'object-curly-spacing': [ 1, 'always' ],
		'operator-linebreak': [ 1, 'after', { overrides: {
			'?': 'before',
			':': 'before'
		} } ],
		'padded-blocks': [ 1, 'never' ],
		'prefer-const': 1,
		'quote-props': [ 1, 'as-needed', { keywords: true } ],
		quotes: [ 1, 'single', 'avoid-escape' ],
		semi: 1,
		'semi-spacing': 1,
		'space-before-blocks': [ 1, 'always' ],
		'space-before-function-paren': [ 1, 'never' ],
		'space-in-parens': [ 1, 'always' ],
		'space-infix-ops': [ 1, { int32Hint: false } ],
		'space-unary-ops': [ 1, {
			overrides: {
				'!': true
			}
		} ],
		'template-curly-spacing': [ 1, 'always' ],
		'valid-jsdoc': [ 1, { requireReturn: false } ],

	}
};