diff --git a/tests/baselines/reference/equalityWithUnionTypes01.errors.txt b/tests/baselines/reference/equalityWithUnionTypes01.errors.txt
new file mode 100644
index 00000000000..985ba9e5867
--- /dev/null
+++ b/tests/baselines/reference/equalityWithUnionTypes01.errors.txt
@@ -0,0 +1,47 @@
+tests/cases/conformance/types/typeRelationships/matchable/equalityWithUnionTypes01.ts(13,5): error TS2365: Operator '===' cannot be applied to types 'number | I2' and 'I1'.
+tests/cases/conformance/types/typeRelationships/matchable/equalityWithUnionTypes01.ts(13,16): error TS2365: Operator '===' cannot be applied to types 'I1' and 'number | I2'.
+tests/cases/conformance/types/typeRelationships/matchable/equalityWithUnionTypes01.ts(15,10): error TS2365: Operator '!==' cannot be applied to types 'number | I2' and 'I1'.
+tests/cases/conformance/types/typeRelationships/matchable/equalityWithUnionTypes01.ts(15,21): error TS2365: Operator '!==' cannot be applied to types 'I1' and 'number | I2'.
+tests/cases/conformance/types/typeRelationships/matchable/equalityWithUnionTypes01.ts(17,10): error TS2365: Operator '==' cannot be applied to types 'number | I2' and 'I1'.
+tests/cases/conformance/types/typeRelationships/matchable/equalityWithUnionTypes01.ts(17,20): error TS2365: Operator '==' cannot be applied to types 'I1' and 'number | I2'.
+tests/cases/conformance/types/typeRelationships/matchable/equalityWithUnionTypes01.ts(19,10): error TS2365: Operator '!=' cannot be applied to types 'number | I2' and 'I1'.
+tests/cases/conformance/types/typeRelationships/matchable/equalityWithUnionTypes01.ts(19,20): error TS2365: Operator '!=' cannot be applied to types 'I1' and 'number | I2'.
+
+
+==== tests/cases/conformance/types/typeRelationships/matchable/equalityWithUnionTypes01.ts (8 errors) ====
+    interface I1 {
+        p1: number
+    }
+    
+    interface I2 extends I1 {
+        p2: number;
+    }
+    
+    var x = { p1: 10, p2: 20 };
+    var y: number | I2 = x;
+    var z: I1 = x;
+    
+    if (y === z || z === y) {
+        ~~~~~~~
+!!! error TS2365: Operator '===' cannot be applied to types 'number | I2' and 'I1'.
+                   ~~~~~~~
+!!! error TS2365: Operator '===' cannot be applied to types 'I1' and 'number | I2'.
+    }
+    else if (y !== z || z !== y) {
+             ~~~~~~~
+!!! error TS2365: Operator '!==' cannot be applied to types 'number | I2' and 'I1'.
+                        ~~~~~~~
+!!! error TS2365: Operator '!==' cannot be applied to types 'I1' and 'number | I2'.
+    }
+    else if (y == z || z == y) {
+             ~~~~~~
+!!! error TS2365: Operator '==' cannot be applied to types 'number | I2' and 'I1'.
+                       ~~~~~~
+!!! error TS2365: Operator '==' cannot be applied to types 'I1' and 'number | I2'.
+    }
+    else if (y != z || z != y) {
+             ~~~~~~
+!!! error TS2365: Operator '!=' cannot be applied to types 'number | I2' and 'I1'.
+                       ~~~~~~
+!!! error TS2365: Operator '!=' cannot be applied to types 'I1' and 'number | I2'.
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/equalityWithUnionTypes01.js b/tests/baselines/reference/equalityWithUnionTypes01.js
new file mode 100644
index 00000000000..05e9f25cd69
--- /dev/null
+++ b/tests/baselines/reference/equalityWithUnionTypes01.js
@@ -0,0 +1,34 @@
+//// [equalityWithUnionTypes01.ts]
+interface I1 {
+    p1: number
+}
+
+interface I2 extends I1 {
+    p2: number;
+}
+
+var x = { p1: 10, p2: 20 };
+var y: number | I2 = x;
+var z: I1 = x;
+
+if (y === z || z === y) {
+}
+else if (y !== z || z !== y) {
+}
+else if (y == z || z == y) {
+}
+else if (y != z || z != y) {
+}
+
+//// [equalityWithUnionTypes01.js]
+var x = { p1: 10, p2: 20 };
+var y = x;
+var z = x;
+if (y === z || z === y) {
+}
+else if (y !== z || z !== y) {
+}
+else if (y == z || z == y) {
+}
+else if (y != z || z != y) {
+}
diff --git a/tests/baselines/reference/switchCaseWithUnionTypes01.errors.txt b/tests/baselines/reference/switchCaseWithUnionTypes01.errors.txt
new file mode 100644
index 00000000000..ee60c210253
--- /dev/null
+++ b/tests/baselines/reference/switchCaseWithUnionTypes01.errors.txt
@@ -0,0 +1,40 @@
+tests/cases/conformance/types/typeRelationships/matchable/switchCaseWithUnionTypes01.ts(19,10): error TS2322: Type 'number | boolean' is not assignable to type 'string | number'.
+  Type 'boolean' is not assignable to type 'string | number'.
+    Type 'boolean' is not assignable to type 'number'.
+tests/cases/conformance/types/typeRelationships/matchable/switchCaseWithUnionTypes01.ts(23,10): error TS2322: Type 'boolean' is not assignable to type 'string | number'.
+  Type 'boolean' is not assignable to type 'number'.
+
+
+==== tests/cases/conformance/types/typeRelationships/matchable/switchCaseWithUnionTypes01.ts (2 errors) ====
+    
+    var strOrNum: string | number;
+    var numOrBool: number | boolean;
+    var str: string;
+    var num: number;
+    var bool: boolean;
+    
+    switch (strOrNum) {
+        // Identical
+        case strOrNum:
+            break;
+    
+        // Constituents
+        case str:
+        case num:
+            break;
+    
+        // Overlap in constituents
+        case numOrBool:
+             ~~~~~~~~~
+!!! error TS2322: Type 'number | boolean' is not assignable to type 'string | number'.
+!!! error TS2322:   Type 'boolean' is not assignable to type 'string | number'.
+!!! error TS2322:     Type 'boolean' is not assignable to type 'number'.
+            break;
+    
+        // No relation
+        case bool:
+             ~~~~
+!!! error TS2322: Type 'boolean' is not assignable to type 'string | number'.
+!!! error TS2322:   Type 'boolean' is not assignable to type 'number'.
+            break;
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/switchCaseWithUnionTypes01.js b/tests/baselines/reference/switchCaseWithUnionTypes01.js
new file mode 100644
index 00000000000..5c34ea674dc
--- /dev/null
+++ b/tests/baselines/reference/switchCaseWithUnionTypes01.js
@@ -0,0 +1,48 @@
+//// [switchCaseWithUnionTypes01.ts]
+
+var strOrNum: string | number;
+var numOrBool: number | boolean;
+var str: string;
+var num: number;
+var bool: boolean;
+
+switch (strOrNum) {
+    // Identical
+    case strOrNum:
+        break;
+
+    // Constituents
+    case str:
+    case num:
+        break;
+
+    // Overlap in constituents
+    case numOrBool:
+        break;
+
+    // No relation
+    case bool:
+        break;
+}
+
+//// [switchCaseWithUnionTypes01.js]
+var strOrNum;
+var numOrBool;
+var str;
+var num;
+var bool;
+switch (strOrNum) {
+    // Identical
+    case strOrNum:
+        break;
+    // Constituents
+    case str:
+    case num:
+        break;
+    // Overlap in constituents
+    case numOrBool:
+        break;
+    // No relation
+    case bool:
+        break;
+}
diff --git a/tests/baselines/reference/typeAssertionsWithUnionTypes01.errors.txt b/tests/baselines/reference/typeAssertionsWithUnionTypes01.errors.txt
new file mode 100644
index 00000000000..2a9dceaf8a6
--- /dev/null
+++ b/tests/baselines/reference/typeAssertionsWithUnionTypes01.errors.txt
@@ -0,0 +1,35 @@
+tests/cases/conformance/types/typeRelationships/matchable/typeAssertionsWithUnionTypes01.ts(13,9): error TS2352: Neither type 'I1' nor type 'number | I2' is assignable to the other.
+  Type 'I1' is not assignable to type 'I2'.
+    Property 'p2' is missing in type 'I1'.
+tests/cases/conformance/types/typeRelationships/matchable/typeAssertionsWithUnionTypes01.ts(14,9): error TS2352: Neither type 'I1' nor type 'number' is assignable to the other.
+tests/cases/conformance/types/typeRelationships/matchable/typeAssertionsWithUnionTypes01.ts(16,9): error TS2352: Neither type 'number | I2' nor type 'I1' is assignable to the other.
+  Type 'number' is not assignable to type 'I1'.
+
+
+==== tests/cases/conformance/types/typeRelationships/matchable/typeAssertionsWithUnionTypes01.ts (3 errors) ====
+    interface I1 {
+        p1: number
+    }
+    
+    interface I2 extends I1 {
+        p2: number;
+    }
+    
+    var x = { p1: 10, p2: 20 };
+    var y: number | I2 = x;
+    var z: I1 = x;
+    
+    var a = <number | I2>z;
+            ~~~~~~~~~~~~~~
+!!! error TS2352: Neither type 'I1' nor type 'number | I2' is assignable to the other.
+!!! error TS2352:   Type 'I1' is not assignable to type 'I2'.
+!!! error TS2352:     Property 'p2' is missing in type 'I1'.
+    var b = <number>z;
+            ~~~~~~~~~
+!!! error TS2352: Neither type 'I1' nor type 'number' is assignable to the other.
+    var c = <I2>z;
+    var d = <I1>y;
+            ~~~~~
+!!! error TS2352: Neither type 'number | I2' nor type 'I1' is assignable to the other.
+!!! error TS2352:   Type 'number' is not assignable to type 'I1'.
+    
\ No newline at end of file
diff --git a/tests/baselines/reference/typeAssertionsWithUnionTypes01.js b/tests/baselines/reference/typeAssertionsWithUnionTypes01.js
new file mode 100644
index 00000000000..9cc448f6217
--- /dev/null
+++ b/tests/baselines/reference/typeAssertionsWithUnionTypes01.js
@@ -0,0 +1,27 @@
+//// [typeAssertionsWithUnionTypes01.ts]
+interface I1 {
+    p1: number
+}
+
+interface I2 extends I1 {
+    p2: number;
+}
+
+var x = { p1: 10, p2: 20 };
+var y: number | I2 = x;
+var z: I1 = x;
+
+var a = <number | I2>z;
+var b = <number>z;
+var c = <I2>z;
+var d = <I1>y;
+
+
+//// [typeAssertionsWithUnionTypes01.js]
+var x = { p1: 10, p2: 20 };
+var y = x;
+var z = x;
+var a = z;
+var b = z;
+var c = z;
+var d = y;