check during compiling

Author: technohippy

src/parser.ts

@@ -2483,16 +2483,8 @@ export class Parser extends DiagnosticEmitter {
         );
         while (!tn.skip(Token.CLOSEBRACE)) {
           let member = this.parseTopLevelStatement(tn, declaration);
-          if (member) {
-            if (member.kind == NodeKind.EXPORT) {
-              this.error(
-                DiagnosticCode.A_default_export_can_only_be_used_in_a_module,
-                member.range,
-              );
-              return null;
-            }
-            members.push(member);
-          } else {
+          if (member) members.push(member);
+          else {
             this.skipStatement(tn);
             if (tn.skip(Token.ENDOFFILE)) {
               this.error(

src/program.ts

@@ -2565,6 +2565,13 @@ export class Program extends DiagnosticEmitter {
           this.initializeVariables(<VariableStatement>member, original);
           break;
         }
+        case NodeKind.EXPORT: {
+          this.error(
+            DiagnosticCode.A_default_export_can_only_be_used_in_a_module,
+            member.range,
+          );
+          break;
+        }
         default: assert(false); // namespace member expected
       }
     }

tests/compiler/export-default-in-namespace.json

@@ -0,0 +1,7 @@
+{
+  "asc_flags": [
+   ],
+  "stderr": [
+    "TS1319: A default export can only be used in a module."
+  ]
+}