102 lines
1.6 KiB
TypeScript
102 lines
1.6 KiB
TypeScript
//// [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
|
|
}
|
|
|
|
interface AList4 {
|
|
forEach(cb: (item: A) => A): void;
|
|
}
|
|
|
|
interface BList4 {
|
|
forEach(cb: (item: B) => B): void;
|
|
}
|
|
|
|
function f14(a: AList4, b: BList4) {
|
|
a = b;
|
|
b = a; // Error
|
|
}
|
|
|
|
|
|
//// [covariantCallbacks.js]
|
|
"use strict";
|
|
// 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
|
|
}
|
|
function f14(a, b) {
|
|
a = b;
|
|
b = a; // Error
|
|
}
|