/**
 * Serializes the media type and the optional parameters as a media type
 * conforming to {@link https://www.rfc-editor.org/rfc/rfc2045.html | RFC 2045} and
 * {@link https://www.rfc-editor.org/rfc/rfc2616.html | RFC 2616}.
 *
 * The type and parameter names are written in lower-case.
 *
 * When any of the arguments results in a standard violation then the return
 * value will be an empty string (`""`).
 *
 * @param type The media type to serialize.
 * @param param Optional parameters to serialize.
 *
 * @returns The serialized media type.
 *
 * @example Basic usage
 * ```ts
 * import { formatMediaType } from "format-media-type.ts";
 * import { assertEquals } from "../assert/mod.ts";
 *
 * assertEquals(formatMediaType("text/plain"), "text/plain");
 * ```
 *
 * @example With parameters
 * ```ts
 * import { formatMediaType } from "format-media-type.ts";
 * import { assertEquals } from "../assert/mod.ts";
 *
 * assertEquals(formatMediaType("text/plain", { charset: "UTF-8" }), "text/plain; charset=UTF-8");
 * ```
 */
export declare function formatMediaType(
  type: string,
  param?: Record<string, string> | Iterable<[string, string]>,
): string;