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export function wrapHelper(helper, transformOptionsFn) {
  if (typeof helper !== 'function') {
    // This should not happen, but apparently it does in https://github.com/wycats/handlebars.js/issues/1639
    // We try to make the wrapper least-invasive by not wrapping it, if the helper is not a function.
    return helper;
  }
  let wrapper = function(/* dynamic arguments */) {
    const options = arguments[arguments.length - 1];
    arguments[arguments.length - 1] = transformOptionsFn(options);
    return helper.apply(this, arguments);
  };
  return wrapper;
}