System modules - Hoist classes like other variables (#9639)

packages/babel-plugin-transform-modules-systemjs/test/fixtures/systemjs/export-default-8/output.mjs

@@ -1,12 +1,14 @@
 System.register([], function (_export, _context) {
   "use strict";
 
+  var Foo;
+
+  _export("default", void 0);
+
   return {
     setters: [],
     execute: function () {
-      class Foo {}
-
-      _export("default", Foo);
+      _export("default", Foo = class Foo {});
     }
   };
 });

packages/babel-plugin-transform-modules-systemjs/test/fixtures/systemjs/exports-variable/output.mjs

@@ -1,13 +1,13 @@
 System.register([], function (_export, _context) {
   "use strict";
 
-  var foo, foo2, foo3, foo4, foo5, foo6;
+  var foo8, foo, foo2, foo3, foo4, foo5, foo6;
 
   function foo7() {}
 
-  _export("foo7", foo7);
-
   _export({
+    foo7: foo7,
+    foo8: void 0,
     foo3: void 0,
     foo5: void 0
   });
@@ -23,9 +23,7 @@ System.register([], function (_export, _context) {
 
       _export("foo6", foo6 = 3);
 
-      class foo8 {}
-
-      _export("foo8", foo8);
+      _export("foo8", foo8 = class foo8 {});
 
       _export("foo3", foo3 = 5);
     }

packages/babel-plugin-transform-modules-systemjs/test/fixtures/systemjs/hoist-function-class/input.mjs

@@ -0,0 +1,15 @@
+export function hoisted () {
+  return HoistedClass, HoistedClassExport, HoistedClassDefaultExport;
+}
+
+class HoistedClass {
+  
+}
+
+export class HoistedClassExport {
+
+}
+
+export default class HoistedClassDefaultExport {
+
+}

packages/babel-plugin-transform-modules-systemjs/test/fixtures/systemjs/hoist-function-class/output.mjs

@@ -0,0 +1,26 @@
+System.register([], function (_export, _context) {
+  "use strict";
+
+  var HoistedClass, HoistedClassExport, HoistedClassDefaultExport;
+
+  function hoisted() {
+    return HoistedClass, HoistedClassExport, HoistedClassDefaultExport;
+  }
+
+  _export({
+    hoisted: hoisted,
+    HoistedClassExport: void 0,
+    default: void 0
+  });
+
+  return {
+    setters: [],
+    execute: function () {
+      HoistedClass = class HoistedClass {};
+
+      _export("HoistedClassExport", HoistedClassExport = class HoistedClassExport {});
+
+      _export("default", HoistedClassDefaultExport = class HoistedClassDefaultExport {});
+    }
+  };
+});

packages/babel-plugin-transform-modules-systemjs/test/fixtures/systemjs/hoist-function-exports/output.mjs

@@ -7,9 +7,10 @@ System.register(["./evens"], function (_export, _context) {
     return _export("p", p = isEven(n) ? n + 1 : n + 2);
   }
 
-  _export("nextOdd", nextOdd);
-
-  _export("a", void 0);
+  _export({
+    nextOdd: nextOdd,
+    a: void 0
+  });
 
   return {
     setters: [function (_evens) {

packages/babel-plugin-transform-modules-systemjs/test/fixtures/systemjs/hoisting-bindings/output.mjs

@@ -8,12 +8,12 @@ System.register([], function (_export, _context) {
     _export("c", +c + 1), c++;
   }
 
-  _export("a", a);
-
   function b() {
     a();
   }
 
+  _export("a", a);
+
   return {
     setters: [],
     execute: function () {