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node_modules/stylelint/lib/utils/isStandardSyntaxUrl.mjs

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+import hasLessInterpolation from './hasLessInterpolation.mjs';
+import hasPsvInterpolation from './hasPsvInterpolation.mjs';
+import hasScssInterpolation from './hasScssInterpolation.mjs';
+import hasTplInterpolation from './hasTplInterpolation.mjs';
+
+const IS_LESS_VARIABLE_IN_URL = /^@@?[\w-]+$/;
+const IS_SCSS_VARIABLE_IN_URL = /^[$\s\w+\-,./*'"@#?]+$/;
+
+/**
+ * Check whether a URL is standard
+ *
+ * @param {string} url
+ * @returns {boolean}
+ */
+export default function isStandardSyntaxUrl(url) {
+	if (url.length === 0) {
+		return true;
+	}
+
+	// Sass interpolation works anywhere
+	if (hasScssInterpolation(url) || hasTplInterpolation(url) || hasPsvInterpolation(url)) {
+		return false;
+	}
+
+	// Inside `'` and `"` work only LESS interpolation
+	if ((url.startsWith(`'`) && url.endsWith(`'`)) || (url.startsWith(`"`) && url.endsWith(`"`))) {
+		if (hasLessInterpolation(url)) {
+			return false;
+		}
+
+		return true;
+	}
+
+	// Less variable works only at the beginning
+	// Check is less variable, allow use '@url/some/path'
+	// https://github.com/less/less.js/blob/3.x/lib/less/parser/parser.js#L547
+	if (url.startsWith('@') && IS_LESS_VARIABLE_IN_URL.test(url)) {
+		return false;
+	}
+
+	// In url without quotes scss variable can be everywhere
+	// But in this case it is allowed to use only specific characters
+	// Also forbidden "/" at the end of url
+	if (url.includes('$') && IS_SCSS_VARIABLE_IN_URL.test(url) && !url.endsWith('/')) {
+		return false;
+	}
+
+	return true;
+}