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'use strict';
// modified from https://github.com/es-shims/es6-shim
var keys = require('object-keys');
var bind = require('function-bind');
var canBeObject = function (obj) {
return typeof obj !== 'undefined' && obj !== null;
};
var hasSymbols = require('has-symbols/shams')();
var toObject = Object;
var push = bind.call(Function.call, Array.prototype.push);
var propIsEnumerable = bind.call(Function.call, Object.prototype.propertyIsEnumerable);
var originalGetSymbols = hasSymbols ? Object.getOwnPropertySymbols : null;
module.exports = function assign(target, source1) {
if (!canBeObject(target)) { throw new TypeError('target must be an object'); }
var objTarget = toObject(target);
var s, source, i, props, syms, value, key;
for (s = 1; s < arguments.length; ++s) {
source = toObject(arguments[s]);
props = keys(source);
var getSymbols = hasSymbols && (Object.getOwnPropertySymbols || originalGetSymbols);
if (getSymbols) {
syms = getSymbols(source);
for (i = 0; i < syms.length; ++i) {
key = syms[i];
if (propIsEnumerable(source, key)) {
push(props, key);
}
}
}
for (i = 0; i < props.length; ++i) {
key = props[i];
value = source[key];
if (propIsEnumerable(source, key)) {
objTarget[key] = value;
}
}
}
return objTarget;
};
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