export declare class SSEManager {
    private static active;
    private static observersRegistered;
    private static onVisibilityChange;
    private static onPageHide;
    private static onPageShow;
    private static initializing;
    static start(): Promise<void>;
    static stop(): void;
    static dispose(): void;
    private static ensureController;
    private static resolveToken;
    private static runSync;
    private static dispatchServerEvent;
    private static registerObservers;
    private static unregisterObservers;
}
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