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node_modules/stylelint/lib/utils/isValidIdentifier.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 ISO_10646_CHARACTERS = /\\[0-9a-f]{1,6}(\\r\\n|[ \t\r\n\f])?/gi;
+const SINGLE_ESCAPED_CHARACTERS = /\\./g;
+const NON_WORD_OR_DASH = /[^\w-]/;
+const DIGIT = /\d/;
+
+/**
+ * Returns whether a string is a valid CSS identifier
+ * (i.e. only alphanumeric characters, `-`, and `_`;
+ * does not have a leading digit, leading dash followed by digit, or two leading dashes)
+ * furthermore, any escaped or ISO 10646 characters are allowed.
+ * @see https://www.w3.org/TR/CSS2/syndata.html#value-def-identifier
+ * @param {string} ident
+ * @returns {boolean}
+ */
+function isValidIdentifier(ident) {
+	if (!ident || ident.trim() === '') {
+		return false;
+	}
+
+	// trims, removes ISO 10646 characters, and singly-escaped characters
+	const trimmedIdent = ident
+		.trim()
+		.replace(ISO_10646_CHARACTERS, '')
+		.replace(SINGLE_ESCAPED_CHARACTERS, '');
+
+	if (NON_WORD_OR_DASH.test(trimmedIdent)) {
+		return false;
+	}
+
+	if (DIGIT.test(trimmedIdent.charAt(0))) {
+		return false;
+	}
+
+	if (trimmedIdent.charAt(0) === '-' && DIGIT.test(trimmedIdent.charAt(1))) {
+		return false;
+	}
+
+	return true;
+}
+
+module.exports = isValidIdentifier;