diff --git a/src/compiler/program.ts b/src/compiler/program.ts
index 8ec821cb66..9a06a49370 100644
--- a/src/compiler/program.ts
+++ b/src/compiler/program.ts
@@ -1071,8 +1071,11 @@ namespace ts {
                             diagnostics.push(createDiagnosticForNode(node, Diagnostics.import_can_only_be_used_in_a_ts_file));
                             return true;
                         case SyntaxKind.ExportAssignment:
-                            diagnostics.push(createDiagnosticForNode(node, Diagnostics.export_can_only_be_used_in_a_ts_file));
-                            return true;
+                            if ((<ExportAssignment>node).isExportEquals) {
+                                diagnostics.push(createDiagnosticForNode(node, Diagnostics.export_can_only_be_used_in_a_ts_file));
+                                return true;
+                            }
+                            break;
                         case SyntaxKind.ClassDeclaration:
                             let classDeclaration = <ClassDeclaration>node;
                             if (checkModifiers(classDeclaration.modifiers) ||
diff --git a/tests/baselines/reference/exportDefaultInJsFile01.errors.txt b/tests/baselines/reference/exportDefaultInJsFile01.errors.txt
new file mode 100644
index 0000000000..34035e1e14
--- /dev/null
+++ b/tests/baselines/reference/exportDefaultInJsFile01.errors.txt
@@ -0,0 +1,7 @@
+error TS5055: Cannot write file 'tests/cases/conformance/salsa/myFile01.js' because it would overwrite input file.
+
+
+!!! error TS5055: Cannot write file 'tests/cases/conformance/salsa/myFile01.js' because it would overwrite input file.
+==== tests/cases/conformance/salsa/myFile01.js (0 errors) ====
+    
+    export default "hello";
\ No newline at end of file
diff --git a/tests/baselines/reference/exportDefaultInJsFile02.errors.txt b/tests/baselines/reference/exportDefaultInJsFile02.errors.txt
new file mode 100644
index 0000000000..5e17306e06
--- /dev/null
+++ b/tests/baselines/reference/exportDefaultInJsFile02.errors.txt
@@ -0,0 +1,7 @@
+error TS5055: Cannot write file 'tests/cases/conformance/salsa/myFile02.js' because it would overwrite input file.
+
+
+!!! error TS5055: Cannot write file 'tests/cases/conformance/salsa/myFile02.js' because it would overwrite input file.
+==== tests/cases/conformance/salsa/myFile02.js (0 errors) ====
+    
+    export default "hello";
\ No newline at end of file
diff --git a/tests/baselines/reference/jsFileCompilationBindMultipleDefaultExports.errors.txt b/tests/baselines/reference/jsFileCompilationBindMultipleDefaultExports.errors.txt
index 733f66922a..05fecf03d3 100644
--- a/tests/baselines/reference/jsFileCompilationBindMultipleDefaultExports.errors.txt
+++ b/tests/baselines/reference/jsFileCompilationBindMultipleDefaultExports.errors.txt
@@ -1,10 +1,9 @@
 tests/cases/compiler/a.js(1,22): error TS2528: A module cannot have multiple default exports.
 tests/cases/compiler/a.js(3,1): error TS2528: A module cannot have multiple default exports.
-tests/cases/compiler/a.js(3,1): error TS8003: 'export=' can only be used in a .ts file.
 tests/cases/compiler/a.js(3,16): error TS1109: Expression expected.
 
 
-==== tests/cases/compiler/a.js (4 errors) ====
+==== tests/cases/compiler/a.js (3 errors) ====
     export default class a {
                          ~
 !!! error TS2528: A module cannot have multiple default exports.
@@ -12,7 +11,5 @@ tests/cases/compiler/a.js(3,16): error TS1109: Expression expected.
     export default var a = 10;
     ~~~~~~~~~~~~~~
 !!! error TS2528: A module cannot have multiple default exports.
-    ~~~~~~~~~~~~~~
-!!! error TS8003: 'export=' can only be used in a .ts file.
                    ~~~
 !!! error TS1109: Expression expected.
\ No newline at end of file
diff --git a/tests/cases/conformance/salsa/exportDefaultInJsFile01.ts b/tests/cases/conformance/salsa/exportDefaultInJsFile01.ts
new file mode 100644
index 0000000000..bf2f3a4e99
--- /dev/null
+++ b/tests/cases/conformance/salsa/exportDefaultInJsFile01.ts
@@ -0,0 +1,6 @@
+// @allowJS: true
+// @target: es3
+// @module: commonjs
+
+// @filename: myFile01.js
+export default "hello";
\ No newline at end of file
diff --git a/tests/cases/conformance/salsa/exportDefaultInJsFile02.ts b/tests/cases/conformance/salsa/exportDefaultInJsFile02.ts
new file mode 100644
index 0000000000..1075b135f1
--- /dev/null
+++ b/tests/cases/conformance/salsa/exportDefaultInJsFile02.ts
@@ -0,0 +1,6 @@
+// @allowJS: true
+// @target: es2015
+// @module: es2015
+
+// @filename: myFile02.js
+export default "hello";
\ No newline at end of file