refactor: init cypress-cucumber-preprocessor install.

node_modules/core-js/modules/es6.regexp.to-string.js

@@ -0,0 +1,25 @@
+'use strict';
+require('./es6.regexp.flags');
+var anObject = require('./_an-object');
+var $flags = require('./_flags');
+var DESCRIPTORS = require('./_descriptors');
+var TO_STRING = 'toString';
+var $toString = /./[TO_STRING];
+
+var define = function (fn) {
+  require('./_redefine')(RegExp.prototype, TO_STRING, fn, true);
+};
+
+// 21.2.5.14 RegExp.prototype.toString()
+if (require('./_fails')(function () { return $toString.call({ source: 'a', flags: 'b' }) != '/a/b'; })) {
+  define(function toString() {
+    var R = anObject(this);
+    return '/'.concat(R.source, '/',
+      'flags' in R ? R.flags : !DESCRIPTORS && R instanceof RegExp ? $flags.call(R) : undefined);
+  });
+// FF44- RegExp#toString has a wrong name
+} else if ($toString.name != TO_STRING) {
+  define(function toString() {
+    return $toString.call(this);
+  });
+}