fix default exported classes without a name

packages/babel-plugin-transform-es2015-modules-commonjs/src/index.js

@@ -267,13 +267,18 @@ export default function () {
                   ]);
                 } else {
                   path.replaceWith(buildExportsAssignment(defNode, t.toExpression(declaration.node)));
+
+                  // Manualy re-queue `export default class {}` expressions so that the ES3 transform
+                  // has an opportunity to convert them. Ideally this would happen automatically from the
+                  // replaceWith above. See #4140 for more info.
+                  path.parentPath.requeue(path.get("expression.left"));
                 }
               } else {
                 path.replaceWith(buildExportsAssignment(t.identifier("default"), declaration.node));
 
                 // Manualy re-queue `export default foo;` expressions so that the ES3 transform
                 // has an opportunity to convert them. Ideally this would happen automatically from the
-                // replaceWith above. See T7166 for more info.
+                // replaceWith above. See #4140 for more info.
                 path.parentPath.requeue(path.get("expression.left"));
               }
               exportDefaultFound = true;

packages/babel-plugin-transform-es2015-modules-commonjs/test/fixtures/regression/es3-compatibility-class/actual.js

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

packages/babel-plugin-transform-es2015-modules-commonjs/test/fixtures/regression/es3-compatibility-class/expected.js

@@ -0,0 +1,6 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports["default"] = class {};

packages/babel-plugin-transform-es2015-modules-commonjs/test/fixtures/regression/es3-compatibility-class/options.json

@@ -0,0 +1,7 @@
+{
+  "plugins": [
+    "transform-es2015-modules-commonjs",
+    "transform-es3-member-expression-literals",
+    "transform-es3-property-literals"
+  ]
+}

packages/babel-plugin-transform-es2015-modules-commonjs/test/fixtures/regression/es3-compatibility-function/actual.js

@@ -0,0 +1 @@
+export default function () {}

packages/babel-plugin-transform-es2015-modules-commonjs/test/fixtures/regression/es3-compatibility-function/expected.js

@@ -0,0 +1,7 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+
+exports["default"] = function () {};

packages/babel-plugin-transform-es2015-modules-commonjs/test/fixtures/regression/es3-compatibility-function/options.json

@@ -0,0 +1,7 @@
+{
+  "plugins": [
+    "transform-es2015-modules-commonjs",
+    "transform-es3-member-expression-literals",
+    "transform-es3-property-literals"
+  ]
+}

packages/babel-plugin-transform-es2015-modules-commonjs/test/fixtures/regression/es3-compatibility-named-class/actual.js

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

packages/babel-plugin-transform-es2015-modules-commonjs/test/fixtures/regression/es3-compatibility-named-class/expected.js

@@ -0,0 +1,7 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+class Foo {}
+exports["default"] = Foo;

packages/babel-plugin-transform-es2015-modules-commonjs/test/fixtures/regression/es3-compatibility-named-class/options.json

@@ -0,0 +1,7 @@
+{
+  "plugins": [
+    "transform-es2015-modules-commonjs",
+    "transform-es3-member-expression-literals",
+    "transform-es3-property-literals"
+  ]
+}

packages/babel-plugin-transform-es2015-modules-commonjs/test/fixtures/regression/es3-compatibility-named-function/actual.js

@@ -0,0 +1 @@
+export default function bat () {}

packages/babel-plugin-transform-es2015-modules-commonjs/test/fixtures/regression/es3-compatibility-named-function/expected.js

@@ -0,0 +1,7 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports["default"] = bat;
+function bat() {}

packages/babel-plugin-transform-es2015-modules-commonjs/test/fixtures/regression/es3-compatibility-named-function/options.json

@@ -0,0 +1,7 @@
+{
+  "plugins": [
+    "transform-es2015-modules-commonjs",
+    "transform-es3-member-expression-literals",
+    "transform-es3-property-literals"
+  ]
+}