/** Minimal per-worker promise-chain mutex. Each task begins only after the
 *  previous task settles; rejection never poisons the tail. Used for adopt
 *  writes where concurrent paste -> delay -> Enter/history verification would
 *  otherwise interleave in the same external CLI composer. */
export declare class AsyncSerialQueue {
    private tail;
    run<T>(task: () => Promise<T>): Promise<T>;
}
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