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node_modules/stylelint/lib/utils/isCustomElement.cjs

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+// NOTICE: This file is generated by Rollup. To modify it,
+// please instead edit the ESM counterpart and rebuild with Rollup (npm run build).
+'use strict';
+
+const svgTags = require('svg-tags');
+const mathMLTags = require('./mathMLTags.cjs');
+
+/**
+ * Check whether a type selector is a custom element
+ *
+ * @param {string} selector
+ * @returns {boolean}
+ */
+function isCustomElement(selector) {
+	if (!/^[a-z]/.test(selector)) {
+		return false;
+	}
+
+	if (!selector.includes('-')) {
+		return false;
+	}
+
+	const selectorLowerCase = selector.toLowerCase();
+
+	if (selectorLowerCase !== selector) {
+		return false;
+	}
+
+	if (svgTags.includes(selectorLowerCase)) {
+		return false;
+	}
+
+	if (mathMLTags.includes(selectorLowerCase)) {
+		return false;
+	}
+
+	return true;
+}
+
+module.exports = isCustomElement;