Correct the condition for variable statement emit in the declaraiton file

tests/baselines/reference/declFileImportModuleWithExportAssignment.js

@@ -45,6 +45,7 @@ declare module m2 {
         listen;
     }
 }
+declare var m2;
 export = m2;
 //// [declFileImportModuleWithExportAssignment_1.d.ts]
 export declare var a;

tests/baselines/reference/declareFileExportAssignment.js

@@ -33,4 +33,5 @@ declare module m2 {
         listen;
     }
 }
+declare var m2;
 export = m2;

tests/baselines/reference/declareFileExportAssignmentWithVarFromVariableStatement.js

@@ -0,0 +1,37 @@
+//// [declareFileExportAssignmentWithVarFromVariableStatement.ts]
+module m2 {
+    export interface connectModule {
+        (res, req, next): void;
+    }
+    export interface connectExport {
+        use: (mod: connectModule) => connectExport;
+        listen: (port: number) => void;
+    }
+
+}
+
+var x = 10, m2: {
+    (): m2.connectExport;
+    test1: m2.connectModule;
+    test2(): m2.connectModule;
+};
+
+export = m2;
+
+//// [declareFileExportAssignmentWithVarFromVariableStatement.js]
+var x = 10, m2;
+module.exports = m2;
+
+
+//// [declareFileExportAssignmentWithVarFromVariableStatement.d.ts]
+declare module m2 {
+    interface connectModule {
+        (res, req, next);
+    }
+    interface connectExport {
+        use;
+        listen;
+    }
+}
+declare var m2;
+export = m2;

tests/cases/compiler/declareFileExportAssignmentWithVarFromVariableStatement.ts

@@ -0,0 +1,20 @@
+//@module: commonjs
+// @declaration: true
+module m2 {
+    export interface connectModule {
+        (res, req, next): void;
+    }
+    export interface connectExport {
+        use: (mod: connectModule) => connectExport;
+        listen: (port: number) => void;
+    }
+
+}
+
+var x = 10, m2: {
+    (): m2.connectExport;
+    test1: m2.connectModule;
+    test2(): m2.connectModule;
+};
+
+export = m2;