/**
 * Formats the given date to IMF date time format. (Reference:
 * https://tools.ietf.org/html/rfc7231#section-7.1.1.1).
 * IMF is the time format to use when generating times in HTTP
 * headers. The time being formatted must be in UTC for Format to
 * generate the correct format.
 *
 * @example
 * ```ts
 * import { toIMF } from "https://deno.land/std@$STD_VERSION/datetime/to_imf.ts";
 *
 * toIMF(new Date(0)); // => returns "Thu, 01 Jan 1970 00:00:00 GMT"
 * ```
 * @param date Date to parse
 * @return IMF date formatted string
 */
export declare function toIMF(date: Date): string;