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- '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);
- }
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