Emit class with export and export default

src/compiler/emitter.ts

@@ -4664,6 +4664,13 @@ module ts {
             }
 
             function emitClassDeclarationAboveES6(node: ClassDeclaration) {
+                if (node.flags & NodeFlags.Export) {
+                    write("export ");
+
+                    if (node.flags & NodeFlags.Default) {
+                        write("default ");
+                    }
+                }
                 write("class ");
                 emitDeclarationName(node);
                 var baseTypeNode = getClassBaseTypeNode(node);

tests/baselines/reference/emitClassDeclarationWithExport.errors.txt

@@ -0,0 +1,16 @@
+tests/cases/conformance/es6/classDeclaration/emitClassDeclarationWithExport.ts(1,14): error TS1148: Cannot compile external modules unless the '--module' flag is provided.
+tests/cases/conformance/es6/classDeclaration/emitClassDeclarationWithExport.ts(5,22): error TS2309: An export assignment cannot be used in a module with other exported elements.
+
+
+==== tests/cases/conformance/es6/classDeclaration/emitClassDeclarationWithExport.ts (2 errors) ====
+    export class C {
+                 ~
+!!! error TS1148: Cannot compile external modules unless the '--module' flag is provided.
+        foo() { }
+    }
+    
+    export default class D {
+                         ~
+!!! error TS2309: An export assignment cannot be used in a module with other exported elements.
+        bar() { }
+    }

tests/baselines/reference/emitClassDeclarationWithExport.js

@@ -0,0 +1,23 @@
+//// [emitClassDeclarationWithExport.ts]
+export class C {
+    foo() { }
+}
+
+export default class D {
+    bar() { }
+}
+
+//// [emitClassDeclarationWithExport.js]
+export class C {
+    constructor() {
+    }
+    foo() {
+    }
+}
+export default class D {
+    constructor() {
+    }
+    bar() {
+    }
+}
+module.exports = D;

tests/cases/conformance/es6/classDeclaration/emitClassDeclarationWithExport.ts

@@ -0,0 +1,8 @@
+// @target: es6
+export class C {
+    foo() { }
+}
+
+export default class D {
+    bar() { }
+}