export declare function createBoundedExecutor<T>({ concurrency, run, getQueuedAt }: {
    concurrency: number;
    run: (task: T) => Promise<void>;
    getQueuedAt?: (task: T) => number | undefined;
}): {
    schedule(task: T): void;
    onIdle(): Promise<void>;
    getInFlight(): number;
    getQueueDepth(): number;
    getOldestQueuedAgeMs(): number;
};
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