/**
 * Extracts a locale from the accept-language header.
 *
 * Use the function on the server to extract the locale
 * from the accept-language header that is sent by the client.
 *
 * @example
 *   const locale = extractLocaleFromHeader(request);
 *
 * @param {Request} request - The request object to extract the locale from.
 * @returns {Locale | undefined} The negotiated preferred language.
 */
export function extractLocaleFromHeader(request: Request): Locale | undefined;
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