/**
 * Safely extract cookie header keys from response headers.
 * Modern browsers support getSetCookie() which returns an array of Set-Cookie values.
 *
 * Note: Set-Cookie headers are often hidden from JavaScript due to security restrictions.
 * The browser's network tab may show Set-Cookie headers that are not accessible via the
 * Fetch API Headers object. This is intentional browser behavior to prevent JavaScript
 * from accessing HttpOnly cookies and other sensitive cookie data.
 *
 * @see https://developer.mozilla.org/en-US/docs/Web/API/Headers/getSetCookie
 *
 * @param headers - The response headers object
 * @returns Array of cookie header keys or empty array if not supported or restricted
 */
export declare const getCookieHeaderKeys: (headers: Headers) => string[];
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