code: async function _loadModuleSyncAsync(filename, userResolver) {
    const localRequire = requireLike(_getResolve(userResolver).parent || settings.get('parent').filename);
    await promisify(setImmediate)();
    return localRequire(filename);
  }
docs: This is a sychronous version of loadModule.  The module is still resolved
  using async methods but the actual loading is done using the native require
  from node.
  
  Load and evaluate a module returning undefined to promise resolve
  on failure.
  
  @private
  @param {string} filename                 The path of the evaluated module.
  @param {Resolver|Object} [userResolver]    Resolver to use, if not a resolver assume it is config for a new resolver.
  @returns {*}