Ensure default exported classes keep entry in export table (#5488)

packages/babel-plugin-transform-es2015-classes/src/index.js

@@ -17,7 +17,10 @@ export default function ({ types: t }) {
 
         // Split the class declaration and the export into two separate statements.
         path.replaceWith(node.declaration);
-        path.insertAfter(t.exportDefaultDeclaration(ref));
+        path.insertAfter(t.exportNamedDeclaration(
+          null,
+          [t.exportSpecifier(ref, t.identifier("default"))]
+        ));
       },
 
       ClassDeclaration(path) {

packages/babel-plugin-transform-es2015-classes/test/fixtures/regression/2663/expected.js

@@ -3,6 +3,7 @@
 Object.defineProperty(exports, "__esModule", {
     value: true
 });
+exports.default = undefined;
 
 var _net = require('net');
 

packages/babel-plugin-transform-es2015-classes/test/fixtures/regression/2694/expected.js

@@ -3,6 +3,7 @@
 Object.defineProperty(exports, "__esModule", {
   value: true
 });
+exports.default = undefined;
 
 var _BaseFoo2 = require('./BaseFoo');
 

packages/babel-plugin-transform-es2015-classes/test/fixtures/regression/2775/expected.js

@@ -3,6 +3,7 @@
 Object.defineProperty(exports, "__esModule", {
   value: true
 });
+exports.default = undefined;
 
 var _react = require('react');
 

packages/babel-plugin-transform-es2015-classes/test/fixtures/spec/export-default/actual.js

@@ -0,0 +1 @@
+export default class Foo {}

packages/babel-plugin-transform-es2015-classes/test/fixtures/spec/export-default/expected.js

@@ -0,0 +1,5 @@
+var Foo = function Foo() {
+  babelHelpers.classCallCheck(this, Foo);
+};
+
+export { Foo as default };

packages/babel-plugin-transform-es2015-classes/test/fixtures/spec/export-super-class/expected.js

@@ -9,4 +9,4 @@ var _class = function (_A) {
   return _class;
 }(A);
 
-export default _class;
+export { _class as default };