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{ logger } from './logger';\nimport { getGlobalObject } from './misc';\n\n/**\n * Tells whether current environment supports ErrorEvent objects\n * {@link supportsErrorEvent}.\n *\n * @returns Answer to the given question.\n */\nexport function supportsErrorEvent(): boolean {\n try {\n new ErrorEvent('');\n return true;\n } catch (e) {\n return false;\n }\n}\n\n/**\n * Tells whether current environment supports DOMError objects\n * {@link supportsDOMError}.\n *\n * @returns Answer to the given question.\n */\nexport function supportsDOMError(): boolean {\n try {\n // Chrome: VM89:1 Uncaught TypeError: Failed to construct 'DOMError':\n // 1 argument required, but only 0 present.\n // @ts-ignore It really needs 1 argument, not 0.\n new DOMError('');\n return true;\n } catch (e) {\n return false;\n }\n}\n\n/**\n * Tells whether current environment supports DOMException objects\n * {@link supportsDOMException}.\n *\n * @returns Answer to the given question.\n */\nexport function supportsDOMException(): boolean {\n try {\n new DOMException('');\n return true;\n } catch (e) {\n return false;\n }\n}\n\n/**\n * Tells whether current environment supports Fetch API\n * {@link supportsFetch}.\n *\n * @returns Answer to the given question.\n */\nexport function supportsFetch(): boolean {\n if (!('fetch' in getGlobalObject<Window>())) {\n return false;\n }\n\n try {\n new Headers();\n new Request('');\n new Response();\n return true;\n } catch (e) {\n return false;\n }\n}\n/**\n * isNativeFetch checks if the given function is a native implementation of fetch()\n */\n// eslint-disable-next-line @typescript-eslint/ban-types\nexport function isNativeFetch(func: Function): boolean {\n return func && /^function fetch\\(\\)\\s+\\{\\s+\\[native code\\]\\s+\\}$/.test(func.toString());\n}\n\n/**\n * Tells whether current environment supports Fetch API natively\n * {@link supportsNativeFetch}.\n *\n * @returns true if `window.fetch` is natively implemented, false otherwise\n */\nexport function supportsNativeFetch(): boolean {\n if (!supportsFetch()) {\n return false;\n }\n\n const global = getGlobalObject<Window>();\n\n // Fast path to avoid DOM I/O\n // eslint-disable-next-line @typescript-eslint/unbound-method\n if (isNativeFetch(global.fetch)) {\n return true;\n }\n\n // window.fetch is implemented, but is polyfilled or already wrapped (e.g: by a chrome extension)\n // so create a \"pure\" iframe to see if that has native fetch\n let result = false;\n const doc = global.document;\n // eslint-disable-next-line deprecation/deprecation\n if (doc && typeof (doc.createElement as unknown) === `function`) {\n try {\n const sandbox = doc.createElement('iframe');\n sandbox.hidden = true;\n doc.head.appendChild(sandbox);\n if (sandbox.contentWindow && sandbox.contentWindow.fetch) {\n // eslint-disable-next-line @typescript-eslint/unbound-method\n result = isNativeFetch(sandbox.contentWindow.fetch);\n }\n doc.head.removeChild(sandbox);\n } catch (err) {\n logger.warn('Could not create sandbox iframe for pure fetch check, bailing to window.fetch: ', err);\n }\n }\n\n return result;\n}\n\n/**\n * Tells whether current environment supports ReportingObserver API\n * {@link supportsReportingObserver}.\n *\n * @returns Answer to the given question.\n */\nexport function supportsReportingObserver(): boolean {\n return 'ReportingObserver' in getGlobalObject();\n}\n\n/**\n * Tells whether current environment supports Referrer Policy API\n * {@link supportsReferrerPolicy}.\n *\n * @returns Answer to the given question.\n */\nexport function supportsReferrerPolicy(): boolean {\n // Despite all stars in the sky saying that Edge supports old draft syntax, aka 'never', 'always', 'origin' and 'default\n // https://caniuse.com/#feat=referrer-policy\n // It doesn't. And it throw exception instead of ignoring this parameter...\n // REF: https://github.com/getsentry/raven-js/issues/1233\n\n if (!supportsFetch()) {\n return false;\n }\n\n try {\n new Request('_', {\n referrerPolicy: 'origin' as ReferrerPolicy,\n });\n return true;\n } catch (e) {\n return false;\n }\n}\n\n/**\n * Tells whether current environment supports History API\n * {@link supportsHistory}.\n *\n * @returns Answer to the given question.\n */\nexport function supportsHistory(): boolean {\n // NOTE: in Chrome App environment, touching history.pushState, *even inside\n // a try/catch block*, will cause Chrome to output an error to console.error\n // borrowed from: https://github.com/angular/angular.js/pull/13945/files\n const global = getGlobalObject<Window>();\n /* eslint-disable @typescript-eslint/no-unsafe-member-access */\n // eslint-disable-next-line @typescript-eslint/no-explicit-any\n const chrome = (global as any).chrome;\n const isChromePackagedApp = chrome && chrome.app && chrome.app.runtime;\n /* eslint-enable @typescript-eslint/no-unsafe-member-access */\n const hasHistoryApi = 'history' in global && !!global.history.pushState && !!global.history.replaceState;\n\n return !isChromePackagedApp && hasHistoryApi;\n}\n"]} |