/**
 * Modifies the provided request object to include a priority field if the lowPriority flag is true.
 * Returns the request object unchanged if lowPriority is false.
 *
 * @internal
 *
 * @param request The request object to be potentially modified.
 * @param lowPriority A boolean flag indicating whether to add a priority field to the request object.
 * @returns The modified request object with a priority field if lowPriority is true,
 *          or the original request object if lowPriority is false.
 */
export declare function withRequestPriority(request: RequestInit, lowPriority: boolean | undefined): RequestInit;
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