/**
 * Promise-based `setTimeout` that races a timer against an optional
 * AbortSignal. If the signal aborts first, the promise rejects with
 * `APIConnectionError` carrying the signal's `.reason` as the cause.
 *
 * Used by the retry loop's exponential-backoff sleep AND the attachments
 * resource's polling loop — same semantics in both places.
 */
export declare function sleep(ms: number, signal?: AbortSignal, abortMessage?: string): Promise<void>;
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