/**
 * Preserve the concrete primary exporter (the upstream batch processor owns it)
 * while sending each already-sanitized batch to the other configured collectors.
 * Each HTTP exporter owns its retries, timeout and concurrency limit. A slow or
 * failed secondary must never hold the primary's callback or cause it to resend.
 * Lifecycle methods still wait for every destination, including pending mirrors.
 */
export declare function mirrorExports<E>(primary: E, additional: E[]): E;
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