.stylelintrc.js

/* eslint-env amd, node */
module.exports = {
	'rules': {
		// Possible errors
		'color-no-invalid-hex': true,
		'font-family-no-duplicate-names': true,
		'font-family-no-missing-generic-family-keyword': true,
		'function-calc-no-unspaced-operator': true,
		'function-linear-gradient-no-nonstandard-direction': true,
		'string-no-newline': true,
		'unit-no-unknown': true,
		'keyframe-declaration-no-important': true,
		'block-no-empty': true,
		'comment-no-empty': true,
		'no-duplicate-at-import-rules': true,
		'no-empty-source': true,
		'no-extra-semicolons': true,
		'no-invalid-double-slash-comments': true,

		// Limit language features
		'selector-max-empty-lines': 0,
		'selector-max-id': 1,

		// Stylistic issues
		'color-hex-case': 'lower',
		'font-weight-notation': 'numeric',
		'function-comma-newline-after': 'never-multi-line',
		'function-comma-newline-before': 'never-multi-line',
		'function-comma-space-after': 'always',
		'function-comma-space-before': 'never',
		'function-max-empty-lines': 0,
		'function-name-case': 'lower',
		'function-parentheses-newline-inside': 'never-multi-line',
		'function-parentheses-space-inside': 'never',
		'function-url-quotes': 'always',
		'function-whitespace-after': 'always',
		'length-zero-no-unit': true,
		'unit-case': 'lower',
		'value-keyword-case': 'lower',
		'property-case': "lower",
		'declaration-bang-space-after': 'never',
		'declaration-bang-space-before': 'always',
		'declaration-colon-newline-after': 'always-multi-line',
		'declaration-colon-space-after': 'always',
		'declaration-colon-space-before': 'never',
		'declaration-empty-line-before': 'never',
		'declaration-block-semicolon-newline-after': 'always-multi-line',
		'declaration-block-semicolon-newline-before': 'never-multi-line',
		'declaration-block-semicolon-space-after': 'always-single-line',
		'declaration-block-semicolon-space-before': 'never',
		'declaration-block-trailing-semicolon': 'always',
		'block-closing-brace-empty-line-before': 'never',
		'block-closing-brace-newline-after': 'always',
		'block-closing-brace-newline-before': 'always-multi-line',
		'block-closing-brace-space-after': null,
		'block-closing-brace-space-before': 'always-single-line',
		'block-opening-brace-newline-after': 'always-multi-line',
		'block-opening-brace-newline-before': 'never-single-line',
		'block-opening-brace-space-after': 'never-single-line',
		'block-opening-brace-space-before': 'always',
		'selector-attribute-brackets-space-inside': 'never',
		'selector-attribute-operator-space-after': 'always',
		'selector-attribute-operator-space-before': 'always',
		'selector-attribute-quotes': 'always',
		'selector-combinator-space-after': 'always',
		'selector-combinator-space-before': 'always',
		'selector-descendant-combinator-no-non-space': true,
		'selector-pseudo-class-case': 'lower',
		'selector-pseudo-class-parentheses-space-inside': 'never',
		'selector-pseudo-element-case': 'lower',
		'selector-pseudo-element-colon-notation': 'double',
		'selector-type-case': 'lower',
		'selector-list-comma-newline-after': 'always',
		'selector-list-comma-newline-before': 'never-multi-line',
		'selector-list-comma-space-after': 'always-single-line',
		'selector-list-comma-space-before': 'never',
		'rule-empty-line-before': [
			'always',
			{
				'except': ['first-nested'],
				'ignore': ['after-comment'],
			},
		],
		'media-feature-colon-space-after': 'always',
		'media-feature-colon-space-before': 'never',
		'media-feature-name-case': 'lower',
		'media-feature-parentheses-space-inside': 'never',
		'media-feature-range-operator-space-after': 'always',
		'media-feature-range-operator-space-before': 'always',
		'media-query-list-comma-newline-after': 'always-multi-line',
		'media-query-list-comma-newline-before': 'never-multi-line',
		'media-query-list-comma-space-after': 'always-single-line',
		'media-query-list-comma-space-before': 'never',
		'at-rule-empty-line-before': [
			'always',
			{
				'except': ['after-same-name', 'inside-block', 'blockless-after-same-name-blockless', 'blockless-after-blockless', 'first-nested'],
			},
		],
		'at-rule-name-case': 'lower',
		'at-rule-name-newline-after': 'always-multi-line',
		'at-rule-name-space-after': 'always',
		'at-rule-semicolon-newline-after': 'always',
		'at-rule-semicolon-space-before': 'never',
		'comment-empty-line-before': [
			'always',
			{
				'except': ['first-nested'],
				'ignore': ['after-comment', 'stylelint-commands'],
			},
		],
		'comment-whitespace-inside': 'always',
		'indentation': 'tab',
		'linebreaks': 'unix',
		'max-empty-lines': [
			1,
			{
				'ignore': ['comments'],
			},
		],
		'no-eol-whitespace': true,
		'no-missing-end-of-source-newline': true,
		'no-empty-first-line': true,
	},
};