text: 'use strict';
  
  var isExtendable = require('is-extendable');
  var assignSymbols = require('assign-symbols');
  
  module.exports = Object.assign || function(obj/*, objects*/) {
    if (obj === null || typeof obj === 'undefined') {
      throw new TypeError('Cannot convert undefined or null to object');
    }
    if (!isObject(obj)) {
      obj = {};
    }
    for (var i = 1; i < arguments.length; i++) {
      var val = arguments[i];
      if (isString(val)) {
        val = toObject(val);
      }
      if (isObject(val)) {
        assign(obj, val);
        assignSymbols(obj, val);
      }
    }
    return obj;
  };
  
  function assign(a, b) {
    for (var key in b) {
      if (hasOwn(b, key)) {
        a[key] = b[key];
      }
    }
  }
  
  function isString(val) {
    return (val && typeof val === 'string');
  }
  
  function toObject(str) {
    var obj = {};
    for (var i in str) {
      obj[i] = str[i];
    }
    return obj;
  }
  
  function isObject(val) {
    return (val && typeof val === 'object') || isExtendable(val);
  }
  
  /**
   * Returns true if the given `key` is an own property of `obj`.
   */
  
  function hasOwn(obj, key) {
    return Object.prototype.hasOwnProperty.call(obj, key);
  }
  
  function isEnum(obj, key) {
    return Object.prototype.propertyIsEnumerable.call(obj, key);
  }
  