/** A minimal async iterable you can push values into and close. Backpressure-free (buffers). */
export declare class PushQueue<T> implements AsyncIterable<T> {
    private buffer;
    private waiters;
    private closed;
    /** Returns whether the value was ACCEPTED (`false` after close — the push is a silent no-op then).
     *  Callers that mirror a pushed value to a second reader gate on this so both sides stay in parity
     *  (#253: a status frame must not reach a side sink the stream itself already refused). */
    push(value: T): boolean;
    close(): void;
    [Symbol.asyncIterator](): AsyncIterator<T>;
}