0;
;(function() {
    'use strict';
/* eslint-disable no-unused-vars */
    var hasOwnProperty = Object.prototype.hasOwnProperty;
    var propIsEnumerable = Object.prototype.propertyIsEnumerable;

    function toObject(val) {
        if (val === null || val === undefined) {
            throw new TypeError('Object.assign cannot be called with null or undefined');
        }

        return Object(val);
    }

    function shouldUseNative() {
        try {
            if (!Object.assign) {
                return false;
            }

            // Detect buggy property enumeration order in older V8 versions.

            // https://bugs.chromium.org/p/v8/issues/detail?id=4118
            var test1 = new String('abc'); // eslint-disable-line no-new-wrappers
            test1[5] = 'de';
            if (Object.getOwnPropertyNames(test1)[0] === '5') {
                return false;
            }

            // https://bugs.chromium.org/p/v8/issues/detail?id=3056
            var test2 = {};
            for (var i = 0; i < 10; i++) {
                test2['_' + String.fromCharCode(i)] = i;
            }
            var order2 = Object.getOwnPropertyNames(test2).map(function(n) {
                return test2[n];
            });
            if (order2.join('') !== '0123456789') {
                return false;
            }

            // https://bugs.chromium.org/p/v8/issues/detail?id=3056
            var test3 = {};
            'abcdefghijklmnopqrst'.split('').forEach(function(letter) {
                test3[letter] = letter;
            });
            if (Object.keys(Object.assign({}, test3)).join('') !==
                'abcdefghijklmnopqrst') {
                return false;
            }

            return true;
        } catch (err) {
            // We don't expect any of the above to throw, but better to be safe.
            return false;
        }
    }

    Object.assign = shouldUseNative() ? Object.assign : function(target, source) {
        var from;
        var to = toObject(target);
        var symbols;

        for (var s = 1; s < arguments.length; s++) {
            from = Object(arguments[s]);

            for (var key in from) {
                if (hasOwnProperty.call(from, key)) {
                    to[key] = from[key];
                }
            }

            if (Object.getOwnPropertySymbols) {
                symbols = Object.getOwnPropertySymbols(from);
                for (var i = 0; i < symbols.length; i++) {
                    if (propIsEnumerable.call(from, symbols[i])) {
                        to[symbols[i]] = from[symbols[i]];
                    }
                }
            }
        }

        return to;
    };
})();;