code: function load( available, toLoad ) {
      let loadList = available;
      if ('string' === typeof toLoad ) {
        loadList = [toLoad];
      }
      if (Array.isArray(toLoad)) {
        loadList = toLoad;
      }
      loadList.forEach(function( name ) {
        if ( available.indexOf(name) < 0 ) {
          return;
        }
        require('./'+name);
      });
    }
docs: Polyfill  : pull the engine into standardized future Extension : provide non-standard behavior Loader function