Adding regression test

tests/baselines/reference/exportDefaultVariable.js

@@ -0,0 +1,12 @@
+//// [exportDefaultVariable.ts]
+// Regression test for #3018
+
+declare var io: any;
+
+declare module 'module' {
+    export default io;
+}
+
+
+//// [exportDefaultVariable.js]
+// Regression test for #3018

tests/baselines/reference/exportDefaultVariable.symbols

@@ -0,0 +1,11 @@
+=== tests/cases/compiler/exportDefaultVariable.ts ===
+// Regression test for #3018
+
+declare var io: any;
+>io : Symbol(io, Decl(exportDefaultVariable.ts, 2, 11))
+
+declare module 'module' {
+    export default io;
+>io : Symbol(default, Decl(exportDefaultVariable.ts, 2, 11))
+}
+

tests/baselines/reference/exportDefaultVariable.types

@@ -0,0 +1,11 @@
+=== tests/cases/compiler/exportDefaultVariable.ts ===
+// Regression test for #3018
+
+declare var io: any;
+>io : any
+
+declare module 'module' {
+    export default io;
+>io : any
+}
+

tests/cases/compiler/exportDefaultVariable.ts

@@ -0,0 +1,7 @@
+// Regression test for #3018
+
+declare var io: any;
+
+declare module 'module' {
+    export default io;
+}