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import { logger } from './logger.js';
import { getGlobalObject } from './worldwide.js';
// eslint-disable-next-line deprecation/deprecation
const WINDOW = getGlobalObject();
/**
* 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 WINDOW)) {
return false;
}
try {
new Headers();
new Request('http://www.example.com');
new Response();
return true;
} catch (e) {
return false;
}
}
/**
* isNativeFetch checks if the given function is a native implementation of fetch()
*/
// eslint-disable-next-line @typescript-eslint/ban-types
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;
}
// Fast path to avoid DOM I/O
// eslint-disable-next-line @typescript-eslint/unbound-method
if (isNativeFetch(WINDOW.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;
const doc = WINDOW.document;
// eslint-disable-next-line deprecation/deprecation
if (doc && typeof (doc.createElement ) === 'function') {
try {
const sandbox = doc.createElement('iframe');
sandbox.hidden = true;
doc.head.appendChild(sandbox);
if (sandbox.contentWindow && sandbox.contentWindow.fetch) {
// eslint-disable-next-line @typescript-eslint/unbound-method
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 WINDOW;
}
/**
* 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;
}
}
export { isNativeFetch, supportsDOMError, supportsDOMException, supportsErrorEvent, supportsFetch, supportsNativeFetch, supportsReferrerPolicy, supportsReportingObserver };
//# sourceMappingURL=supports.js.map
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