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node_modules/stylelint/lib/utils/isStandardSyntaxAtRule.mjs

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+/**
+ * Check whether a at-rule is standard
+ *
+ * @param {import('postcss').AtRule | import('postcss-less').AtRule} atRule postcss at-rule node
+ * @returns {boolean} If `true`, the declaration is standard
+ */
+export default function isStandardSyntaxAtRule(atRule) {
+	// Ignore scss `@content` inside mixins
+	if (!atRule.nodes && atRule.params === '') {
+		return false;
+	}
+
+	// Ignore Less mixins
+	if ('mixin' in atRule && atRule.mixin) {
+		return false;
+	}
+
+	// Ignore Less detached ruleset `@detached-ruleset: { background: red; }; .top { @detached-ruleset(); }`
+	if (
+		('variable' in atRule && atRule.variable) ||
+		(!atRule.nodes && atRule.raws.afterName === '' && atRule.params[0] === '(')
+	) {
+		return false;
+	}
+
+	return true;
+}