diff --git a/tests/baselines/reference/classExtendingPrimitive2.errors.txt b/tests/baselines/reference/classExtendingPrimitive2.errors.txt
new file mode 100644
index 0000000000000..9d1f62d535034
--- /dev/null
+++ b/tests/baselines/reference/classExtendingPrimitive2.errors.txt
@@ -0,0 +1,11 @@
+==== tests/cases/conformance/classes/classDeclarations/classHeritageSpecification/classExtendingPrimitive2.ts (3 errors) ====
+    // classes cannot extend primitives
+    
+    class C4a extends void {}
+                      ~~~~
+!!! Identifier expected.
+    class C5a extends null { }
+                      ~~~~
+!!! Identifier expected.
+                           ~
+!!! ';' expected.
\ No newline at end of file
diff --git a/tests/baselines/reference/classExtendsEveryObjectType2.errors.txt b/tests/baselines/reference/classExtendsEveryObjectType2.errors.txt
new file mode 100644
index 0000000000000..7a5573ae00054
--- /dev/null
+++ b/tests/baselines/reference/classExtendsEveryObjectType2.errors.txt
@@ -0,0 +1,10 @@
+==== tests/cases/conformance/classes/classDeclarations/classHeritageSpecification/classExtendsEveryObjectType2.ts (3 errors) ====
+    class C2 extends { foo: string; } { } // error
+                     ~
+!!! Identifier expected.
+    
+    class C6 extends []{ } // error
+                     ~
+!!! Identifier expected.
+                       ~
+!!! ';' expected.
\ No newline at end of file
diff --git a/tests/baselines/reference/duplicateVarAndImport.js b/tests/baselines/reference/duplicateVarAndImport.js
new file mode 100644
index 0000000000000..245ed733a447d
--- /dev/null
+++ b/tests/baselines/reference/duplicateVarAndImport.js
@@ -0,0 +1,9 @@
+//// [duplicateVarAndImport.ts]
+// no error since module is not instantiated
+
+var a;
+module M { }
+import a = M;
+
+//// [duplicateVarAndImport.js]
+var a;
diff --git a/tests/baselines/reference/duplicateVarAndImport2.errors.txt b/tests/baselines/reference/duplicateVarAndImport2.errors.txt
new file mode 100644
index 0000000000000..b6f52fc23cbe3
--- /dev/null
+++ b/tests/baselines/reference/duplicateVarAndImport2.errors.txt
@@ -0,0 +1,7 @@
+==== tests/cases/compiler/duplicateVarAndImport2.ts (1 errors) ====
+    // error since module is instantiated
+    var a;
+    module M { export var x = 1; }
+    import a = M;
+    ~~~~~~~~~~~~~
+!!! Import declaration conflicts with local declaration of 'a'
\ No newline at end of file
diff --git a/tests/baselines/reference/duplicateVarAndImport2.js b/tests/baselines/reference/duplicateVarAndImport2.js
new file mode 100644
index 0000000000000..b0c05f254a6a5
--- /dev/null
+++ b/tests/baselines/reference/duplicateVarAndImport2.js
@@ -0,0 +1,13 @@
+//// [duplicateVarAndImport2.ts]
+// error since module is instantiated
+var a;
+module M { export var x = 1; }
+import a = M;
+
+//// [duplicateVarAndImport2.js]
+var a;
+var M;
+(function (M) {
+    M.x = 1;
+})(M || (M = {}));
+var a = M;
diff --git a/tests/cases/compiler/duplicateVarAndImport.ts b/tests/cases/compiler/duplicateVarAndImport.ts
new file mode 100644
index 0000000000000..f8daf5ea9c916
--- /dev/null
+++ b/tests/cases/compiler/duplicateVarAndImport.ts
@@ -0,0 +1,5 @@
+// no error since module is not instantiated
+
+var a;
+module M { }
+import a = M;
\ No newline at end of file
diff --git a/tests/cases/compiler/duplicateVarAndImport2.ts b/tests/cases/compiler/duplicateVarAndImport2.ts
new file mode 100644
index 0000000000000..f42b2bcf50bdd
--- /dev/null
+++ b/tests/cases/compiler/duplicateVarAndImport2.ts
@@ -0,0 +1,4 @@
+// error since module is instantiated
+var a;
+module M { export var x = 1; }
+import a = M;
\ No newline at end of file
diff --git a/tests/cases/conformance/classes/classDeclarations/classHeritageSpecification/classExtendingPrimitive2.ts b/tests/cases/conformance/classes/classDeclarations/classHeritageSpecification/classExtendingPrimitive2.ts
new file mode 100644
index 0000000000000..58b397cbd84ed
--- /dev/null
+++ b/tests/cases/conformance/classes/classDeclarations/classHeritageSpecification/classExtendingPrimitive2.ts
@@ -0,0 +1,4 @@
+// classes cannot extend primitives
+
+class C4a extends void {}
+class C5a extends null { }
\ No newline at end of file
diff --git a/tests/cases/conformance/classes/classDeclarations/classHeritageSpecification/classExtendsEveryObjectType2.ts b/tests/cases/conformance/classes/classDeclarations/classHeritageSpecification/classExtendsEveryObjectType2.ts
new file mode 100644
index 0000000000000..095c0a1154475
--- /dev/null
+++ b/tests/cases/conformance/classes/classDeclarations/classHeritageSpecification/classExtendsEveryObjectType2.ts
@@ -0,0 +1,3 @@
+class C2 extends { foo: string; } { } // error
+
+class C6 extends []{ } // error
\ No newline at end of file