File: functionSubtypingOfVarArgs2.ts

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class EventBase {
    private _listeners: { (...args: any[]): void; }[] = [];

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

class StringEvent extends EventBase {
    add(listener: (items: string, moreitems: number) => void ) {
        super.add(listener);
    }
}