add a workaround of a Closure Compiler unsafe optimization, close #972

CHANGELOG.md

@@ -1,5 +1,6 @@
 ## Changelog
 ##### Unreleased
+- Added a workaround of a Closure Compiler unsafe optimization, [#972](https://github.com/zloirock/core-js/issues/972)
 - One more fix crashing of `Object.create(null)` on WSH, [#970](https://github.com/zloirock/core-js/issues/970)
 
 ##### 3.16.1 - 2021.08.09

packages/core-js/internals/regexp-sticky-helpers.js

@@ -1,19 +1,18 @@
 var fails = require('../internals/fails');
+var global = require('../internals/global');
 
-// babel-minify transpiles RegExp('a', 'y') -> /a/y and it causes SyntaxError,
-var RE = function (s, f) {
-  return RegExp(s, f);
-};
+// babel-minify and Closure Compiler transpiles RegExp('a', 'y') -> /a/y and it causes SyntaxError
+var $RegExp = global.RegExp;
 
 exports.UNSUPPORTED_Y = fails(function () {
-  var re = RE('a', 'y');
+  var re = $RegExp('a', 'y');
   re.lastIndex = 2;
   return re.exec('abcd') != null;
 });
 
 exports.BROKEN_CARET = fails(function () {
   // https://bugzilla.mozilla.org/show_bug.cgi?id=773687
-  var re = RE('^r', 'gy');
+  var re = $RegExp('^r', 'gy');
   re.lastIndex = 2;
   return re.exec('str') != null;
 });

packages/core-js/internals/regexp-unsupported-dot-all.js

@@ -1,7 +1,10 @@
 var fails = require('./fails');
+var global = require('../internals/global');
+
+// babel-minify and Closure Compiler transpiles RegExp('.', 's') -> /./s and it causes SyntaxError
+var $RegExp = global.RegExp;
 
 module.exports = fails(function () {
-  // babel-minify transpiles RegExp('.', 's') -> /./s and it causes SyntaxError
-  var re = RegExp('.', (typeof '').charAt(0));
+  var re = $RegExp('.', 's');
   return !(re.dotAll && re.exec('\n') && re.flags === 's');
 });

packages/core-js/internals/regexp-unsupported-ncg.js

@@ -1,8 +1,11 @@
 var fails = require('./fails');
+var global = require('../internals/global');
+
+// babel-minify and Closure Compiler transpiles RegExp('.', 'g') -> /./g and it causes SyntaxError
+var $RegExp = global.RegExp;
 
 module.exports = fails(function () {
-  // babel-minify transpiles RegExp('.', 'g') -> /./g and it causes SyntaxError
-  var re = RegExp('(?<a>b)', (typeof '').charAt(5));
+  var re = $RegExp('(?<a>b)', 'g');
   return re.exec('b').groups.a !== 'b' ||
     'b'.replace(re, '$<a>c') !== 'bc';
 });