error-to-string.js
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error-to-string.js
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	'use strict';
	var DESCRIPTORS = require('../internals/descriptors');
	var fails = require('../internals/fails');
	var anObject = require('../internals/an-object');
	var create = require('../internals/object-create');
	var normalizeStringArgument = require('../internals/normalize-string-argument');

	var nativeErrorToString = Error.prototype.toString;

	var INCORRECT_TO_STRING = fails(function () {
	if (DESCRIPTORS) {
	// Chrome 32- incorrectly call accessor
	// eslint-disable-next-line es/no-object-defineproperty -- safe
	var object = create(Object.defineProperty({}, 'name', { get: function () {
	return this === object;
	} }));
	if (nativeErrorToString.call(object) !== 'true') return true;
	}
	// FF10- does not properly handle non-strings
	return nativeErrorToString.call({ message: 1, name: 2 }) !== '2: 1'
	// IE8 does not properly handle defaults
	\|\| nativeErrorToString.call({}) !== 'Error';
	});

	module.exports = INCORRECT_TO_STRING ? function toString() {
	var O = anObject(this);
	var name = normalizeStringArgument(O.name, 'Error');
	var message = normalizeStringArgument(O.message);
	return !name ? message : !message ? name : name + ': ' + message;
	} : nativeErrorToString;