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node_modules/stylelint/lib/utils/isStandardSyntaxDeclaration.mjs

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+import { isRule } from './typeGuards.mjs';
+import isScssVariable from './isScssVariable.mjs';
+
+/**
+ * Check whether a declaration is standard
+ *
+ * @param {import('postcss').Declaration | import('postcss-less').Declaration} decl
+ * @returns {boolean}
+ */
+export default function isStandardSyntaxDeclaration(decl) {
+	const prop = decl.prop;
+	const parent = decl.parent;
+
+	// SCSS var; covers map and list declarations
+	if (isScssVariable(prop)) {
+		return false;
+	}
+
+	// Less var (e.g. @var: x), but exclude variable interpolation (e.g. @{var})
+	if (prop[0] === '@' && prop[1] !== '{') {
+		return false;
+	}
+
+	// Less map declaration
+	if (parent && parent.type === 'atrule' && parent.raws.afterName === ':') {
+		return false;
+	}
+
+	// Less map (e.g. #my-map() { myprop: red; })
+	if (
+		parent &&
+		isRule(parent) &&
+		parent.selector &&
+		parent.selector.startsWith('#') &&
+		parent.selector.endsWith('()')
+	) {
+		return false;
+	}
+
+	// Sass nested properties (e.g. border: { style: solid; color: red; })
+	if (
+		parent &&
+		isRule(parent) &&
+		parent.selector &&
+		parent.selector[parent.selector.length - 1] === ':' &&
+		parent.selector.substring(0, 2) !== '--'
+	) {
+		return false;
+	}
+
+	// Less &:extend
+	if ('extend' in decl && decl.extend) {
+		return false;
+	}
+
+	return true;
+}