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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    // tslint:disable:no-unused-expression\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    // It really needs 1 argument, not 0.\n    // Chrome: VM89:1 Uncaught TypeError: Failed to construct 'DOMError':\n    // 1 argument required, but only 0 present.\n    // @ts-ignore\n    // tslint:disable:no-unused-expression\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    // tslint:disable:no-unused-expression\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    // tslint:disable-next-line:no-unused-expression\n    new Headers();\n    // tslint:disable-next-line:no-unused-expression\n    new Request('');\n    // tslint:disable-next-line:no-unused-expression\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 */\nfunction 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  // tslint:disable-next-line:no-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  // tslint:disable-next-line:no-unbound-method 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        // tslint:disable-next-line:no-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  // tslint:disable-next-line: no-unsafe-any\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    // tslint:disable:no-unused-expression\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  const chrome = (global as any).chrome;\n  // tslint:disable-next-line:no-unsafe-any\n  const isChromePackagedApp = chrome && chrome.app && chrome.app.runtime;\n  const hasHistoryApi = 'history' in global && !!global.history.pushState && !!global.history.replaceState;\n\n  return !isChromePackagedApp && hasHistoryApi;\n}\n"]}