/**
 * Read, extract and parse the value from "Retry-After" header from Fetch's Response Headers object.
 * - If provided as string number, convert it to milliseconds.
 * - If provided as date, subtracts the current date and return the difference in milliseconds.
 *
 * @see {@link https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Retry-After}
 * @param value - The HTTP Response Headers object
 * @returns Delay in ms or or null if not parseable
 */
export declare function getRetryDelayFromResponse(response: {
    headers?: Headers;
}): number | null;