stylelint/lib/utils/isStandardSyntaxAtRule.js

A mighty, modern CSS linter.

/* @flow */
'use strict';

/**
 * Check whether a at-rule is standard
 *
 * @param {atRule} postcss at-rule node
 * @return {boolean} If `true`, the declaration is standard
 */
module.exports = function(atRule /*: Object*/) /*: boolean*/ {
	// Ignore scss `@content` inside mixins
	if (!atRule.nodes && atRule.params === '') {
		return false;
	}

	// Ignore Less mixins
	if (atRule.mixin) {
		return false;
	}

	// Ignore Less detached ruleset `@detached-ruleset: { background: red; }; .top { @detached-ruleset(); }`
	if (
		atRule.variable ||
		(!atRule.nodes && atRule.raws.afterName === '' && atRule.params[0] === '(')
	) {
		return false;
	}

	return true;
};