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/*! * Adapted directly from media-typer at https://github.com/jshttp/media-typer/ * which is licensed as follows: * * media-typer * Copyright(c) 2014-2017 Douglas Christopher Wilson * MIT Licensed */
const SUBTYPE_NAME_REGEXP = /^[A-Za-z0-9][A-Za-z0-9!#$&^_.-]{0,126}$/;const TYPE_NAME_REGEXP = /^[A-Za-z0-9][A-Za-z0-9!#$&^_-]{0,126}$/;const TYPE_REGEXP =  /^ *([A-Za-z0-9][A-Za-z0-9!#$&^_-]{0,126})\/([A-Za-z0-9][A-Za-z0-9!#$&^_.+-]{0,126}) *$/;
class MediaType {  constructor(    /** The type of the media type. */    public type: string,    /** The subtype of the media type. */    public subtype: string,    /** The optional suffix of the media type. */    public suffix?: string,  ) {}}
/** Given a media type object, return a media type string. * *       format({ *         type: "text", *         subtype: "html" *       }); // returns "text/html" */export function format(obj: MediaType): string {  const { subtype, suffix, type } = obj;
  if (!TYPE_NAME_REGEXP.test(type)) {    throw new TypeError("Invalid type.");  }  if (!SUBTYPE_NAME_REGEXP.test(subtype)) {    throw new TypeError("Invalid subtype.");  }
  let str = `${type}/${subtype}`;
  if (suffix) {    if (!TYPE_NAME_REGEXP.test(suffix)) {      throw new TypeError("Invalid suffix.");    }
    str += `+${suffix}`;  }
  return str;}
/** Given a media type string, return a media type object. * *       parse("application/json-patch+json"); *       // returns { *       //   type: "application", *       //   subtype: "json-patch", *       //   suffix: "json" *       // } */export function parse(str: string): MediaType {  const match = TYPE_REGEXP.exec(str.toLowerCase());
  if (!match) {    throw new TypeError("Invalid media type.");  }
  let [, type, subtype] = match;  let suffix: string | undefined;
  const idx = subtype.lastIndexOf("+");  if (idx !== -1) {    suffix = subtype.substr(idx + 1);    subtype = subtype.substr(0, idx);  }
  return new MediaType(type, subtype, suffix);}