export declare class BrowserLaunchTracker<T extends {
    close(): Promise<void>;
}> {
    private pending;
    private cancelled;
    get size(): number;
    track(_key: string, launch: Promise<T>): Promise<T>;
    release(_key: string, launch: Promise<T>): void;
    wasCancelled(launch: Promise<T>): boolean;
    closeAllPending(): Promise<void>;
}
//# sourceMappingURL=BrowserLaunchTracker.d.ts.map