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Add tests
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‎tests/baselines/reference/covariantCallbacks.errors.txt

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tests/cases/conformance/types/typeRelationships/assignmentCompatibility/covariantCallbacks.ts(12,5): error TS2322: Type 'P<A>' is not assignable to type 'P<B>'.
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Type 'A' is not assignable to type 'B'.
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Property 'b' is missing in type 'A'.
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tests/cases/conformance/types/typeRelationships/assignmentCompatibility/covariantCallbacks.ts(17,5): error TS2322: Type 'Promise<A>' is not assignable to type 'Promise<B>'.
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Type 'A' is not assignable to type 'B'.
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tests/cases/conformance/types/typeRelationships/assignmentCompatibility/covariantCallbacks.ts(30,5): error TS2322: Type 'AList1' is not assignable to type 'BList1'.
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Types of property 'forEach' are incompatible.
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Type '(cb: (item: A) => void) => void' is not assignable to type '(cb: (item: B) => void) => void'.
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Types of parameters 'cb' and 'cb' are incompatible.
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Types of parameters 'item' and 'item' are incompatible.
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Type 'A' is not assignable to type 'B'.
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tests/cases/conformance/types/typeRelationships/assignmentCompatibility/covariantCallbacks.ts(43,5): error TS2322: Type 'AList2' is not assignable to type 'BList2'.
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Types of property 'forEach' are incompatible.
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Type '(cb: (item: A) => boolean) => void' is not assignable to type '(cb: (item: A) => void) => void'.
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Types of parameters 'cb' and 'cb' are incompatible.
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Type 'void' is not assignable to type 'boolean'.
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tests/cases/conformance/types/typeRelationships/assignmentCompatibility/covariantCallbacks.ts(56,5): error TS2322: Type 'AList3' is not assignable to type 'BList3'.
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Types of property 'forEach' are incompatible.
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Type '(cb: (item: A) => void) => void' is not assignable to type '(cb: (item: A, context: any) => void) => void'.
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Types of parameters 'cb' and 'cb' are incompatible.
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==== tests/cases/conformance/types/typeRelationships/assignmentCompatibility/covariantCallbacks.ts (5 errors) ====
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// Test that callback parameters are related covariantly
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interface P<T> {
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then(cb: (value: T) => void): void;
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};
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interface A { a: string }
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interface B extends A { b: string }
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function f1(a: P<A>, b: P<B>) {
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a = b;
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b = a; // Error
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~
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!!! error TS2322: Type 'P<A>' is not assignable to type 'P<B>'.
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!!! error TS2322: Type 'A' is not assignable to type 'B'.
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!!! error TS2322: Property 'b' is missing in type 'A'.
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}
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function f2(a: Promise<A>, b: Promise<B>) {
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a = b;
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b = a; // Error
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~
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!!! error TS2322: Type 'Promise<A>' is not assignable to type 'Promise<B>'.
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!!! error TS2322: Type 'A' is not assignable to type 'B'.
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}
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interface AList1 {
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forEach(cb: (item: A) => void): void;
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}
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interface BList1 {
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forEach(cb: (item: B) => void): void;
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}
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function f11(a: AList1, b: BList1) {
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a = b;
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b = a; // Error
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~
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!!! error TS2322: Type 'AList1' is not assignable to type 'BList1'.
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!!! error TS2322: Types of property 'forEach' are incompatible.
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!!! error TS2322: Type '(cb: (item: A) => void) => void' is not assignable to type '(cb: (item: B) => void) => void'.
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!!! error TS2322: Types of parameters 'cb' and 'cb' are incompatible.
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!!! error TS2322: Types of parameters 'item' and 'item' are incompatible.
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!!! error TS2322: Type 'A' is not assignable to type 'B'.
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}
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interface AList2 {
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forEach(cb: (item: A) => boolean): void;
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}
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interface BList2 {
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forEach(cb: (item: A) => void): void;
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}
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function f12(a: AList2, b: BList2) {
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a = b;
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b = a; // Error
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~
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!!! error TS2322: Type 'AList2' is not assignable to type 'BList2'.
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!!! error TS2322: Types of property 'forEach' are incompatible.
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!!! error TS2322: Type '(cb: (item: A) => boolean) => void' is not assignable to type '(cb: (item: A) => void) => void'.
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!!! error TS2322: Types of parameters 'cb' and 'cb' are incompatible.
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!!! error TS2322: Type 'void' is not assignable to type 'boolean'.
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}
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interface AList3 {
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forEach(cb: (item: A) => void): void;
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}
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interface BList3 {
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forEach(cb: (item: A, context: any) => void): void;
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}
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function f13(a: AList3, b: BList3) {
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a = b;
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b = a; // Error
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~
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!!! error TS2322: Type 'AList3' is not assignable to type 'BList3'.
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!!! error TS2322: Types of property 'forEach' are incompatible.
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!!! error TS2322: Type '(cb: (item: A) => void) => void' is not assignable to type '(cb: (item: A, context: any) => void) => void'.
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!!! error TS2322: Types of parameters 'cb' and 'cb' are incompatible.
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}

‎tests/baselines/reference/covariantCallbacks.js

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//// [covariantCallbacks.ts]
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// Test that callback parameters are related covariantly
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interface P<T> {
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then(cb: (value: T) => void): void;
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};
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interface A { a: string }
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interface B extends A { b: string }
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function f1(a: P<A>, b: P<B>) {
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a = b;
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b = a; // Error
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}
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function f2(a: Promise<A>, b: Promise<B>) {
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a = b;
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b = a; // Error
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}
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interface AList1 {
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forEach(cb: (item: A) => void): void;
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}
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interface BList1 {
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forEach(cb: (item: B) => void): void;
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}
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function f11(a: AList1, b: BList1) {
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a = b;
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b = a; // Error
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}
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interface AList2 {
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forEach(cb: (item: A) => boolean): void;
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}
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interface BList2 {
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forEach(cb: (item: A) => void): void;
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}
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function f12(a: AList2, b: BList2) {
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a = b;
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b = a; // Error
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}
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interface AList3 {
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forEach(cb: (item: A) => void): void;
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}
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interface BList3 {
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forEach(cb: (item: A, context: any) => void): void;
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}
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function f13(a: AList3, b: BList3) {
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a = b;
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b = a; // Error
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}
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//// [covariantCallbacks.js]
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// Test that callback parameters are related covariantly
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;
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function f1(a, b) {
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a = b;
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b = a; // Error
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}
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function f2(a, b) {
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a = b;
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b = a; // Error
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}
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function f11(a, b) {
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a = b;
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b = a; // Error
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}
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function f12(a, b) {
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a = b;
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b = a; // Error
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}
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function f13(a, b) {
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a = b;
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b = a; // Error
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}

‎tests/cases/conformance/types/typeRelationships/assignmentCompatibility/covariantCallbacks.ts

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// @target: es2015
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// Test that callback parameters are related covariantly
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interface P<T> {
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then(cb: (value: T) => void): void;
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};
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interface A { a: string }
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interface B extends A { b: string }
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function f1(a: P<A>, b: P<B>) {
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a = b;
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b = a; // Error
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}
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function f2(a: Promise<A>, b: Promise<B>) {
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a = b;
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b = a; // Error
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}
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interface AList1 {
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forEach(cb: (item: A) => void): void;
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}
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interface BList1 {
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forEach(cb: (item: B) => void): void;
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}
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function f11(a: AList1, b: BList1) {
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a = b;
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b = a; // Error
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}
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interface AList2 {
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forEach(cb: (item: A) => boolean): void;
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}
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interface BList2 {
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forEach(cb: (item: A) => void): void;
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}
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function f12(a: AList2, b: BList2) {
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a = b;
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b = a; // Error
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}
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interface AList3 {
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forEach(cb: (item: A) => void): void;
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}
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interface BList3 {
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forEach(cb: (item: A, context: any) => void): void;
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}
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function f13(a: AList3, b: BList3) {
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a = b;
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b = a; // Error
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}

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