@sentry/core/build/esm/utils/supports.js

Base implementation for all Sentry JavaScript SDKs

import { DEBUG_BUILD } from '../debug-build.js';
import { debug } from './debug-logger.js';
import { GLOBAL_OBJ } from './worldwide.js';

const WINDOW = GLOBAL_OBJ;
function supportsErrorEvent() {
  try {
    new ErrorEvent("");
    return true;
  } catch {
    return false;
  }
}
function supportsDOMError() {
  try {
    new DOMError("");
    return true;
  } catch {
    return false;
  }
}
function supportsDOMException() {
  try {
    new DOMException("");
    return true;
  } catch {
    return false;
  }
}
function supportsHistory() {
  return "history" in WINDOW && !!WINDOW.history;
}
const supportsFetch = _isFetchSupported;
function _isFetchSupported() {
  if (!("fetch" in WINDOW)) {
    return false;
  }
  try {
    new Headers();
    new Request("data:,");
    new Response();
    return true;
  } catch {
    return false;
  }
}
function isNativeFunction(func) {
  return func && /^function\s+\w+\(\)\s+\{\s+\[native code\]\s+\}$/.test(func.toString());
}
function supportsNativeFetch() {
  if (typeof EdgeRuntime === "string") {
    return true;
  }
  if (!_isFetchSupported()) {
    return false;
  }
  if (isNativeFunction(WINDOW.fetch)) {
    return true;
  }
  let result = false;
  const doc = WINDOW.document;
  if (doc && typeof doc.createElement === "function") {
    try {
      const sandbox = doc.createElement("iframe");
      sandbox.hidden = true;
      doc.head.appendChild(sandbox);
      if (sandbox.contentWindow?.fetch) {
        result = isNativeFunction(sandbox.contentWindow.fetch);
      }
      doc.head.removeChild(sandbox);
    } catch (err) {
      DEBUG_BUILD && debug.warn("Could not create sandbox iframe for pure fetch check, bailing to window.fetch: ", err);
    }
  }
  return result;
}
function supportsReportingObserver() {
  return "ReportingObserver" in WINDOW;
}
function supportsReferrerPolicy() {
  if (!_isFetchSupported()) {
    return false;
  }
  try {
    new Request("_", {
      referrerPolicy: "origin"
    });
    return true;
  } catch {
    return false;
  }
}

export { isNativeFunction, supportsDOMError, supportsDOMException, supportsErrorEvent, supportsFetch, supportsHistory, supportsNativeFetch, supportsReferrerPolicy, supportsReportingObserver };
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