Handle multiple named groups in wrapRegExp replace() (#15090)

Previously, the [Symbol.replace] implementation in BabelRegExp assumed
that the groups object property values were only numbers. With the
duplicate named capturing groups plugin, they can be arrays of numbers
as well.

In the case of a duplicate named capturing group, the replacement
pattern $<name> can be replaced by the concatenation of the pattern
indices that have that name: e.g., $1$2.

packages/babel-helpers/src/helpers-generated.ts

@@ -59,6 +59,6 @@ export default Object.freeze({
   ),
   wrapRegExp: helper(
     "7.19.0",
-    'import setPrototypeOf from"setPrototypeOf";import inherits from"inherits";export default function _wrapRegExp(){_wrapRegExp=function(re,groups){return new BabelRegExp(re,void 0,groups)};var _super=RegExp.prototype,_groups=new WeakMap;function BabelRegExp(re,flags,groups){var _this=new RegExp(re,flags);return _groups.set(_this,groups||_groups.get(re)),setPrototypeOf(_this,BabelRegExp.prototype)}function buildGroups(result,re){var g=_groups.get(re);return Object.keys(g).reduce((function(groups,name){var i=g[name];if("number"==typeof i)groups[name]=result[i];else{for(var k=0;void 0===result[i[k]]&&k+1<i.length;)k++;groups[name]=result[i[k]]}return groups}),Object.create(null))}return inherits(BabelRegExp,RegExp),BabelRegExp.prototype.exec=function(str){var result=_super.exec.call(this,str);return result&&(result.groups=buildGroups(result,this)),result},BabelRegExp.prototype[Symbol.replace]=function(str,substitution){if("string"==typeof substitution){var groups=_groups.get(this);return _super[Symbol.replace].call(this,str,substitution.replace(/\\$<([^>]+)>/g,(function(_,name){return"$"+groups[name]})))}if("function"==typeof substitution){var _this=this;return _super[Symbol.replace].call(this,str,(function(){var args=arguments;return"object"!=typeof args[args.length-1]&&(args=[].slice.call(args)).push(buildGroups(args,_this)),substitution.apply(this,args)}))}return _super[Symbol.replace].call(this,str,substitution)},_wrapRegExp.apply(this,arguments)}',
+    'import setPrototypeOf from"setPrototypeOf";import inherits from"inherits";export default function _wrapRegExp(){_wrapRegExp=function(re,groups){return new BabelRegExp(re,void 0,groups)};var _super=RegExp.prototype,_groups=new WeakMap;function BabelRegExp(re,flags,groups){var _this=new RegExp(re,flags);return _groups.set(_this,groups||_groups.get(re)),setPrototypeOf(_this,BabelRegExp.prototype)}function buildGroups(result,re){var g=_groups.get(re);return Object.keys(g).reduce((function(groups,name){var i=g[name];if("number"==typeof i)groups[name]=result[i];else{for(var k=0;void 0===result[i[k]]&&k+1<i.length;)k++;groups[name]=result[i[k]]}return groups}),Object.create(null))}return inherits(BabelRegExp,RegExp),BabelRegExp.prototype.exec=function(str){var result=_super.exec.call(this,str);return result&&(result.groups=buildGroups(result,this)),result},BabelRegExp.prototype[Symbol.replace]=function(str,substitution){if("string"==typeof substitution){var groups=_groups.get(this);return _super[Symbol.replace].call(this,str,substitution.replace(/\\$<([^>]+)>/g,(function(_,name){var group=groups[name];return"$"+(Array.isArray(group)?group.join("$"):group)})))}if("function"==typeof substitution){var _this=this;return _super[Symbol.replace].call(this,str,(function(){var args=arguments;return"object"!=typeof args[args.length-1]&&(args=[].slice.call(args)).push(buildGroups(args,_this)),substitution.apply(this,args)}))}return _super[Symbol.replace].call(this,str,substitution)},_wrapRegExp.apply(this,arguments)}',
   ),
 });

packages/babel-helpers/src/helpers/wrapRegExp.js

@@ -31,7 +31,8 @@ export default function _wrapRegExp() {
         this,
         str,
         substitution.replace(/\$<([^>]+)>/g, function (_, name) {
-          return "$" + groups[name];
+          var group = groups[name];
+          return "$" + (Array.isArray(group) ? group.join("$") : group);
         })
       );
     } else if (typeof substitution === "function") {

packages/babel-plugin-proposal-duplicate-named-capturing-groups-regex/test/fixtures/runtime/replace.js

@@ -0,0 +1,5 @@
+let regexp = /(?<named>a)|(?<named>b)|c/;
+
+expect("a".replace(regexp, "[$<named>]")).toEqual("[a]");
+expect("b".replace(regexp, "[$<named>]")).toEqual("[b]");
+expect("c".replace(regexp, "[$<named>]")).toEqual("[]");