supports.js
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	import { getGlobalObject } from './global.js';
	import { logger } from './logger.js';

	/**
	* Tells whether current environment supports ErrorEvent objects
	* {@link supportsErrorEvent}.
	*
	* @returns Answer to the given question.
	*/
	function supportsErrorEvent() {
	try {
	new ErrorEvent('');
	return true;
	} catch (e) {
	return false;
	}
	}

	/**
	* Tells whether current environment supports DOMError objects
	* {@link supportsDOMError}.
	*
	* @returns Answer to the given question.
	*/
	function supportsDOMError() {
	try {
	// Chrome: VM89:1 Uncaught TypeError: Failed to construct 'DOMError':
	// 1 argument required, but only 0 present.
	// @ts-ignore It really needs 1 argument, not 0.
	new DOMError('');
	return true;
	} catch (e) {
	return false;
	}
	}

	/**
	* Tells whether current environment supports DOMException objects
	* {@link supportsDOMException}.
	*
	* @returns Answer to the given question.
	*/
	function supportsDOMException() {
	try {
	new DOMException('');
	return true;
	} catch (e) {
	return false;
	}
	}

	/**
	* Tells whether current environment supports Fetch API
	* {@link supportsFetch}.
	*
	* @returns Answer to the given question.
	*/
	function supportsFetch() {
	if (!('fetch' in getGlobalObject())) {
	return false;
	}

	try {
	new Headers();
	new Request('');
	new Response();
	return true;
	} catch (e) {
	return false;
	}
	}
	/**
	* isNativeFetch checks if the given function is a native implementation of fetch()
	*/
	function isNativeFetch(func) {
	return func && /^function fetch\s+\{\s+\[native code\]\s+\}$/.test(func.toString());
	}

	/**
	* Tells whether current environment supports Fetch API natively
	* {@link supportsNativeFetch}.
	*
	* @returns true if `window.fetch` is natively implemented, false otherwise
	*/
	function supportsNativeFetch() {
	if (!supportsFetch()) {
	return false;
	}

	var global = getGlobalObject();

	// Fast path to avoid DOM I/O
	if (isNativeFetch(global.fetch)) {
	return true;
	}

	// window.fetch is implemented, but is polyfilled or already wrapped (e.g: by a chrome extension)
	// so create a "pure" iframe to see if that has native fetch
	let result = false;
	var doc = global.document;
	if (doc && typeof (doc.createElement ) === 'function') {
	try {
	var sandbox = doc.createElement('iframe');
	sandbox.hidden = true;
	doc.head.appendChild(sandbox);
	if (sandbox.contentWindow && sandbox.contentWindow.fetch) {
	result = isNativeFetch(sandbox.contentWindow.fetch);
	}
	doc.head.removeChild(sandbox);
	} catch (err) {
	(typeof __SENTRY_DEBUG__ === 'undefined' \|\| __SENTRY_DEBUG__) &&
	logger.warn('Could not create sandbox iframe for pure fetch check, bailing to window.fetch: ', err);
	}
	}

	return result;
	}

	/**
	* Tells whether current environment supports ReportingObserver API
	* {@link supportsReportingObserver}.
	*
	* @returns Answer to the given question.
	*/
	function supportsReportingObserver() {
	return 'ReportingObserver' in getGlobalObject();
	}

	/**
	* Tells whether current environment supports Referrer Policy API
	* {@link supportsReferrerPolicy}.
	*
	* @returns Answer to the given question.
	*/
	function supportsReferrerPolicy() {
	// Despite all stars in the sky saying that Edge supports old draft syntax, aka 'never', 'always', 'origin' and 'default'
	// (see https://caniuse.com/#feat=referrer-policy),
	// it doesn't. And it throws an exception instead of ignoring this parameter...
	// REF: https://github.com/getsentry/raven-js/issues/1233

	if (!supportsFetch()) {
	return false;
	}

	try {
	new Request('_', {
	referrerPolicy: 'origin' ,
	});
	return true;
	} catch (e) {
	return false;
	}
	}

	/**
	* Tells whether current environment supports History API
	* {@link supportsHistory}.
	*
	* @returns Answer to the given question.
	*/
	function supportsHistory() {
	// NOTE: in Chrome App environment, touching history.pushState, *even inside
	// a try/catch block*, will cause Chrome to output an error to console.error
	// borrowed from: https://github.com/angular/angular.js/pull/13945/files
	var global = getGlobalObject();
	var chrome = (global ).chrome;
	var isChromePackagedApp = chrome && chrome.app && chrome.app.runtime;
	var hasHistoryApi = 'history' in global && !!global.history.pushState && !!global.history.replaceState;

	return !isChromePackagedApp && hasHistoryApi;
	}

	export { isNativeFetch, supportsDOMError, supportsDOMException, supportsErrorEvent, supportsFetch, supportsHistory, supportsNativeFetch, supportsReferrerPolicy, supportsReportingObserver };
	//# sourceMappingURL=supports.js.map

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