diff --git a/tests/baselines/reference/declarationEmitDefaultExportWithTempVarName.js b/tests/baselines/reference/declarationEmitDefaultExportWithTempVarName.js
new file mode 100644
index 00000000000..a0c8ab59b97
--- /dev/null
+++ b/tests/baselines/reference/declarationEmitDefaultExportWithTempVarName.js
@@ -0,0 +1,19 @@
+//// [pi.ts]
+export default 3.14159;
+
+//// [pi.js]
+System.register([], function(exports_1, context_1) {
+    "use strict";
+    var __moduleName = context_1 && context_1.id;
+    return {
+        setters:[],
+        execute: function() {
+            exports_1("default",3.14159);
+        }
+    }
+});
+
+
+//// [pi.d.ts]
+declare var _default: number;
+export default _default;
diff --git a/tests/baselines/reference/declarationEmitDefaultExportWithTempVarName.symbols b/tests/baselines/reference/declarationEmitDefaultExportWithTempVarName.symbols
new file mode 100644
index 00000000000..a45ecb2e47e
--- /dev/null
+++ b/tests/baselines/reference/declarationEmitDefaultExportWithTempVarName.symbols
@@ -0,0 +1,3 @@
+=== tests/cases/compiler/pi.ts ===
+export default 3.14159;
+No type information for this code.
\ No newline at end of file
diff --git a/tests/baselines/reference/declarationEmitDefaultExportWithTempVarName.types b/tests/baselines/reference/declarationEmitDefaultExportWithTempVarName.types
new file mode 100644
index 00000000000..a45ecb2e47e
--- /dev/null
+++ b/tests/baselines/reference/declarationEmitDefaultExportWithTempVarName.types
@@ -0,0 +1,3 @@
+=== tests/cases/compiler/pi.ts ===
+export default 3.14159;
+No type information for this code.
\ No newline at end of file
diff --git a/tests/baselines/reference/declarationEmitDefaultExportWithTempVarNameWithBundling.js b/tests/baselines/reference/declarationEmitDefaultExportWithTempVarNameWithBundling.js
new file mode 100644
index 00000000000..a42233dba55
--- /dev/null
+++ b/tests/baselines/reference/declarationEmitDefaultExportWithTempVarNameWithBundling.js
@@ -0,0 +1,38 @@
+//// [pi.ts]
+
+export default 3.14159;
+
+//// [app.js]
+System.register("pi", [], function(exports_1, context_1) {
+    "use strict";
+    var __moduleName = context_1 && context_1.id;
+    return {
+        setters:[],
+        execute: function() {
+            exports_1("default",3.14159);
+        }
+    }
+});
+
+
+//// [app.d.ts]
+declare module "pi" {
+    declare var _default: number;
+    export default _default;
+}
+
+
+//// [DtsFileErrors]
+
+
+app.d.ts(2,5): error TS1038: A 'declare' modifier cannot be used in an already ambient context.
+
+
+==== app.d.ts (1 errors) ====
+    declare module "pi" {
+        declare var _default: number;
+        ~~~~~~~
+!!! error TS1038: A 'declare' modifier cannot be used in an already ambient context.
+        export default _default;
+    }
+    
\ No newline at end of file
diff --git a/tests/baselines/reference/declarationEmitDefaultExportWithTempVarNameWithBundling.symbols b/tests/baselines/reference/declarationEmitDefaultExportWithTempVarNameWithBundling.symbols
new file mode 100644
index 00000000000..82f52e818e3
--- /dev/null
+++ b/tests/baselines/reference/declarationEmitDefaultExportWithTempVarNameWithBundling.symbols
@@ -0,0 +1,4 @@
+=== tests/cases/compiler/pi.ts ===
+
+No type information for this code.export default 3.14159;
+No type information for this code.
\ No newline at end of file
diff --git a/tests/baselines/reference/declarationEmitDefaultExportWithTempVarNameWithBundling.types b/tests/baselines/reference/declarationEmitDefaultExportWithTempVarNameWithBundling.types
new file mode 100644
index 00000000000..82f52e818e3
--- /dev/null
+++ b/tests/baselines/reference/declarationEmitDefaultExportWithTempVarNameWithBundling.types
@@ -0,0 +1,4 @@
+=== tests/cases/compiler/pi.ts ===
+
+No type information for this code.export default 3.14159;
+No type information for this code.
\ No newline at end of file
diff --git a/tests/cases/compiler/declarationEmitDefaultExportWithTempVarName.ts b/tests/cases/compiler/declarationEmitDefaultExportWithTempVarName.ts
new file mode 100644
index 00000000000..13c967c4fe5
--- /dev/null
+++ b/tests/cases/compiler/declarationEmitDefaultExportWithTempVarName.ts
@@ -0,0 +1,4 @@
+// @declaration: true
+// @module: system
+// @Filename: pi.ts
+export default 3.14159;
\ No newline at end of file
diff --git a/tests/cases/compiler/declarationEmitDefaultExportWithTempVarNameWithBundling.ts b/tests/cases/compiler/declarationEmitDefaultExportWithTempVarNameWithBundling.ts
new file mode 100644
index 00000000000..6bd5320f3fe
--- /dev/null
+++ b/tests/cases/compiler/declarationEmitDefaultExportWithTempVarNameWithBundling.ts
@@ -0,0 +1,6 @@
+// @declaration: true
+// @module: system
+// @outFile: app.js
+
+// @Filename: pi.ts
+export default 3.14159;
\ No newline at end of file