diff --git a/tests/baselines/reference/covariantCallbacks.errors.txt b/tests/baselines/reference/covariantCallbacks.errors.txt
deleted file mode 100644
index 3a1ea25b96e46..0000000000000
--- a/tests/baselines/reference/covariantCallbacks.errors.txt
+++ /dev/null
@@ -1,105 +0,0 @@
-tests/cases/conformance/types/typeRelationships/assignmentCompatibility/covariantCallbacks.ts(12,5): error TS2322: Type 'P<A>' is not assignable to type 'P<B>'.
-  Type 'A' is not assignable to type 'B'.
-    Property 'b' is missing in type 'A'.
-tests/cases/conformance/types/typeRelationships/assignmentCompatibility/covariantCallbacks.ts(17,5): error TS2322: Type 'Promise<A>' is not assignable to type 'Promise<B>'.
-  Type 'A' is not assignable to type 'B'.
-tests/cases/conformance/types/typeRelationships/assignmentCompatibility/covariantCallbacks.ts(30,5): error TS2322: Type 'AList1' is not assignable to type 'BList1'.
-  Types of property 'forEach' are incompatible.
-    Type '(cb: (item: A) => void) => void' is not assignable to type '(cb: (item: B) => void) => void'.
-      Types of parameters 'cb' and 'cb' are incompatible.
-        Types of parameters 'item' and 'item' are incompatible.
-          Type 'A' is not assignable to type 'B'.
-tests/cases/conformance/types/typeRelationships/assignmentCompatibility/covariantCallbacks.ts(43,5): error TS2322: Type 'AList2' is not assignable to type 'BList2'.
-  Types of property 'forEach' are incompatible.
-    Type '(cb: (item: A) => boolean) => void' is not assignable to type '(cb: (item: A) => void) => void'.
-      Types of parameters 'cb' and 'cb' are incompatible.
-        Type 'void' is not assignable to type 'boolean'.
-tests/cases/conformance/types/typeRelationships/assignmentCompatibility/covariantCallbacks.ts(56,5): error TS2322: Type 'AList3' is not assignable to type 'BList3'.
-  Types of property 'forEach' are incompatible.
-    Type '(cb: (item: A) => void) => void' is not assignable to type '(cb: (item: A, context: any) => void) => void'.
-      Types of parameters 'cb' and 'cb' are incompatible.
-
-
-==== tests/cases/conformance/types/typeRelationships/assignmentCompatibility/covariantCallbacks.ts (5 errors) ====
-    // Test that callback parameters are related covariantly
-    
-    interface P<T> {
-        then(cb: (value: T) => void): void;
-    };
-    
-    interface A { a: string }
-    interface B extends A { b: string }
-    
-    function f1(a: P<A>, b: P<B>) {
-        a = b;
-        b = a;  // Error
-        ~
-!!! error TS2322: Type 'P<A>' is not assignable to type 'P<B>'.
-!!! error TS2322:   Type 'A' is not assignable to type 'B'.
-!!! error TS2322:     Property 'b' is missing in type 'A'.
-    }
-    
-    function f2(a: Promise<A>, b: Promise<B>) {
-        a = b;
-        b = a;  // Error
-        ~
-!!! error TS2322: Type 'Promise<A>' is not assignable to type 'Promise<B>'.
-!!! error TS2322:   Type 'A' is not assignable to type 'B'.
-    }
-    
-    interface AList1 {
-        forEach(cb: (item: A) => void): void;
-    }
-    
-    interface BList1 {
-        forEach(cb: (item: B) => void): void;
-    }
-    
-    function f11(a: AList1, b: BList1) {
-        a = b;
-        b = a;  // Error
-        ~
-!!! error TS2322: Type 'AList1' is not assignable to type 'BList1'.
-!!! error TS2322:   Types of property 'forEach' are incompatible.
-!!! error TS2322:     Type '(cb: (item: A) => void) => void' is not assignable to type '(cb: (item: B) => void) => void'.
-!!! error TS2322:       Types of parameters 'cb' and 'cb' are incompatible.
-!!! error TS2322:         Types of parameters 'item' and 'item' are incompatible.
-!!! error TS2322:           Type 'A' is not assignable to type 'B'.
-    }
-    
-    interface AList2 {
-        forEach(cb: (item: A) => boolean): void;
-    }
-    
-    interface BList2 {
-        forEach(cb: (item: A) => void): void;
-    }
-    
-    function f12(a: AList2, b: BList2) {
-        a = b;
-        b = a;  // Error
-        ~
-!!! error TS2322: Type 'AList2' is not assignable to type 'BList2'.
-!!! error TS2322:   Types of property 'forEach' are incompatible.
-!!! error TS2322:     Type '(cb: (item: A) => boolean) => void' is not assignable to type '(cb: (item: A) => void) => void'.
-!!! error TS2322:       Types of parameters 'cb' and 'cb' are incompatible.
-!!! error TS2322:         Type 'void' is not assignable to type 'boolean'.
-    }
-    
-    interface AList3 {
-        forEach(cb: (item: A) => void): void;
-    }
-    
-    interface BList3 {
-        forEach(cb: (item: A, context: any) => void): void;
-    }
-    
-    function f13(a: AList3, b: BList3) {
-        a = b;
-        b = a;  // Error
-        ~
-!!! error TS2322: Type 'AList3' is not assignable to type 'BList3'.
-!!! error TS2322:   Types of property 'forEach' are incompatible.
-!!! error TS2322:     Type '(cb: (item: A) => void) => void' is not assignable to type '(cb: (item: A, context: any) => void) => void'.
-!!! error TS2322:       Types of parameters 'cb' and 'cb' are incompatible.
-    }
\ No newline at end of file
diff --git a/tests/baselines/reference/covariantCallbacks.js b/tests/baselines/reference/covariantCallbacks.js
deleted file mode 100644
index fb2ecfbc3c18e..0000000000000
--- a/tests/baselines/reference/covariantCallbacks.js
+++ /dev/null
@@ -1,82 +0,0 @@
-//// [covariantCallbacks.ts]
-// Test that callback parameters are related covariantly
-
-interface P<T> {
-    then(cb: (value: T) => void): void;
-};
-
-interface A { a: string }
-interface B extends A { b: string }
-
-function f1(a: P<A>, b: P<B>) {
-    a = b;
-    b = a;  // Error
-}
-
-function f2(a: Promise<A>, b: Promise<B>) {
-    a = b;
-    b = a;  // Error
-}
-
-interface AList1 {
-    forEach(cb: (item: A) => void): void;
-}
-
-interface BList1 {
-    forEach(cb: (item: B) => void): void;
-}
-
-function f11(a: AList1, b: BList1) {
-    a = b;
-    b = a;  // Error
-}
-
-interface AList2 {
-    forEach(cb: (item: A) => boolean): void;
-}
-
-interface BList2 {
-    forEach(cb: (item: A) => void): void;
-}
-
-function f12(a: AList2, b: BList2) {
-    a = b;
-    b = a;  // Error
-}
-
-interface AList3 {
-    forEach(cb: (item: A) => void): void;
-}
-
-interface BList3 {
-    forEach(cb: (item: A, context: any) => void): void;
-}
-
-function f13(a: AList3, b: BList3) {
-    a = b;
-    b = a;  // Error
-}
-
-//// [covariantCallbacks.js]
-// Test that callback parameters are related covariantly
-;
-function f1(a, b) {
-    a = b;
-    b = a; // Error
-}
-function f2(a, b) {
-    a = b;
-    b = a; // Error
-}
-function f11(a, b) {
-    a = b;
-    b = a; // Error
-}
-function f12(a, b) {
-    a = b;
-    b = a; // Error
-}
-function f13(a, b) {
-    a = b;
-    b = a; // Error
-}
diff --git a/tests/cases/conformance/types/typeRelationships/assignmentCompatibility/covariantCallbacks.ts b/tests/cases/conformance/types/typeRelationships/assignmentCompatibility/covariantCallbacks.ts
deleted file mode 100644
index c46f396f414ea..0000000000000
--- a/tests/cases/conformance/types/typeRelationships/assignmentCompatibility/covariantCallbacks.ts
+++ /dev/null
@@ -1,59 +0,0 @@
-// @target: es2015
-
-// Test that callback parameters are related covariantly
-
-interface P<T> {
-    then(cb: (value: T) => void): void;
-};
-
-interface A { a: string }
-interface B extends A { b: string }
-
-function f1(a: P<A>, b: P<B>) {
-    a = b;
-    b = a;  // Error
-}
-
-function f2(a: Promise<A>, b: Promise<B>) {
-    a = b;
-    b = a;  // Error
-}
-
-interface AList1 {
-    forEach(cb: (item: A) => void): void;
-}
-
-interface BList1 {
-    forEach(cb: (item: B) => void): void;
-}
-
-function f11(a: AList1, b: BList1) {
-    a = b;
-    b = a;  // Error
-}
-
-interface AList2 {
-    forEach(cb: (item: A) => boolean): void;
-}
-
-interface BList2 {
-    forEach(cb: (item: A) => void): void;
-}
-
-function f12(a: AList2, b: BList2) {
-    a = b;
-    b = a;  // Error
-}
-
-interface AList3 {
-    forEach(cb: (item: A) => void): void;
-}
-
-interface BList3 {
-    forEach(cb: (item: A, context: any) => void): void;
-}
-
-function f13(a: AList3, b: BList3) {
-    a = b;
-    b = a;  // Error
-}
\ No newline at end of file