code: function mergeTypes(env, types, conf, ENV, fn) {
    fetch(conf, 'types', function(err, layout) {
      if (err) return fn(err);
      debug('# TYPES');
  
      var batch = new Batch();
  
      batch.concurrency(1);
  
      types.forEach(function(type) {
        batch.push(function(cb) {
          debug(type);
          mergeConf(env, layout, type, ENV, cb);
        });
      });
  
      batch.end(fn);
    });
  }
docs: Merge types into ENV
  
  @param {String} env
  @param {Array} types
  @param {Object} conf
  @param {Object} ENV
  @param {Function} fn