type TabId = number;
type Origin = string;
export type ActiveTab = {
    id: TabId;
    origin: Origin;
};
export declare const possiblyActiveTabs: Map<number, string>;
export declare function startActiveTabTracking(): void;
export declare function stopActiveTabTracking(): void;
export declare function addActiveTabListener(callback: (tab: ActiveTab) => void): void;
export {};