1  /*!
 2   * is-extendable <https://github.com/jonschlinkert/is-extendable>
 3   *
 4   * Copyright (c) 2015-2017, Jon Schlinkert.
 5   * Released under the MIT License.
 6   */
 7  
 8  'use strict';
 9  
10  var isPlainObject = require('is-plain-object');
11  
12  module.exports = function isExtendable(val) {
13    return isPlainObject(val) || typeof val === 'function' || Array.isArray(val);
14  };