/**
 * Resolve to `fallback` when `signal` aborts before `promise` settles, leaving
 * `promise` itself running: callers that share one coalesced upstream request
 * keep their own cancellation without cancelling each other's answer.
 */
export declare function settleOrAbort<T>(promise: Promise<T>, signal: AbortSignal | undefined, fallback: T): Promise<T>;
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