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//// [varianceCallbacksAndIndexedAccesses.ts]
type Source = {
<K extends keyof WindowEventMap>(type: K, listener: (this: Window, ev: WindowEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
}
interface Action1<T> {
(arg: T): void;
}
interface MessageEventLike<T> {
source: WindowLike<T>;
origin: string;
data: T;
}
interface PostMessageObject<T> {
postMessage(message: T, host: string): void;
}
interface WindowLike<T> extends PostMessageObject<T> {
addEventListener(type: "message", handler: Action1<MessageEventLike<T>>): void;
addEventListener(type: string, handler: Action1<any>): void;
removeEventListener(type: "message", handler: Action1<MessageEventLike<T>>): void;
removeEventListener(type: string, handler: Action1<any>): void;
}
type Target = {
(type: "message", handler: Action1<MessageEventLike<any>>): void;
(type: string, handler: Action1<any>): void;
};
function f1(s: Source, t: Target) {
t = s;
}
//// [varianceCallbacksAndIndexedAccesses.js]
function f1(s, t) {
t = s;
}
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