File: genericPrototypeProperty2.ts

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interface EventTarget { x } 
class BaseEvent {
    target: EventTarget;
}

class MyEvent<T extends EventTarget> extends BaseEvent {
    target: T;
}
class BaseEventWrapper {
    t: BaseEvent;
}

class MyEventWrapper extends BaseEventWrapper {
    t: MyEvent<any>; // any satisfies constraint and passes assignability check between 'target' properties
}