e: "text/coffeescript",
  elm: "text/elm",
  cljc: "text/x-clojure",
  cljs: "text/x-clojurescript",
};

/**
 * Returns the content type for the specified URL.  If no specific
 * content type can be determined, "text/plain" is returned.
 *
 * @return String
 *         The content type.
 */
function getContentType(url) {
  url = trimUrlQuery(url);
  const dot = url.lastIndexOf(".");
  if (dot >= 0) {
    const name = url.substring(dot + 1);
    if (name in contentMap) {
      return contentMap[name];
    }
  }
  return "text/plain";
}

function memoize(func) {
  const map = new Map();

  return arg => {
    if (map.has(arg)) {
      return map.get(arg);
    }

    const result = func(arg);
    map.set(arg, result);
    return result;
  };
}

module.exports = {
  originalToGeneratedId,
  generatedToOriginalId,
  isOriginalId,
  isGeneratedId,
  getContentType,
  contentMapForTesting: contentMap,
};
PK