export = SubscriptionTracker;
declare class SubscriptionTracker {
    static singleton(): any;
    _subs: Map<any, any>;
    subscribe(topic: any, handler: any, signal: any): AbortSignal | import("abort-controller").AbortSignal;
    unsubscribe(topic: any, handler: any): void;
}
declare namespace SubscriptionTracker {
    const instance: any;
}
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