add all frontend files

node_modules/safe-regex-test/index.js

@@ -0,0 +1,17 @@
+'use strict';
+
+var callBound = require('call-bound');
+var isRegex = require('is-regex');
+
+var $exec = callBound('RegExp.prototype.exec');
+var $TypeError = require('es-errors/type');
+
+/** @type {import('.')} */
+module.exports = function regexTester(regex) {
+	if (!isRegex(regex)) {
+		throw new $TypeError('`regex` must be a RegExp');
+	}
+	return function test(s) {
+		return $exec(regex, s) !== null;
+	};
+};