'use strict';

// modified from 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;

};