File: functionSubtypingOfVarArgs.ts

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node-typescript 3.3.3333-1
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class EventBase {
    private _listeners = [];

    add(listener: (...args: any[]) => void): void {
        this._listeners.push(listener);
    }
}

class StringEvent extends EventBase { // should work
    add(listener: (items: string) => void ) { // valid, items is subtype of args
        super.add(listener);
    }
}