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{"version":3,"file":"supports.js","sources":["../../src/supports.ts"],"sourcesContent":["import { DEBUG_BUILD } from './debug-build';\nimport { logger } from './logger';\nimport { getGlobalObject } from './worldwide';\n\n// eslint-disable-next-line deprecation/deprecation\nconst WINDOW = getGlobalObject<Window>();\n\ndeclare const EdgeRuntime: string | undefined;\n\nexport { supportsHistory } from './vendor/supportsHistory';\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-expect-error 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 WINDOW)) {\n return false;\n }\n\n try {\n new Headers();\n new Request('http://www.example.com');\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 (typeof EdgeRuntime === 'string') {\n return true;\n }\n\n if (!supportsFetch()) {\n return false;\n }\n\n // Fast path to avoid DOM I/O\n // eslint-disable-next-line @typescript-eslint/unbound-method\n if (isNativeFetch(WINDOW.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 = WINDOW.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 DEBUG_BUILD &&\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 WINDOW;\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 // (see https://caniuse.com/#feat=referrer-policy),\n // it doesn't. 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