// Metro module 986 (f987).
import { GLOBAL_OBJ } from "./Module821";
import { DEBUG_BUILD } from "./Module823";
import { debug } from "./consoleSandbox";
let isNativeFunction;
const _isFetchSupported = function _isFetchSupported() {
  if ("fetch" in GLOBAL_OBJ) {
    try {
      new Headers();
      new Request("data:,");
      new Response();
    } catch ($e) {
      return false;
    }
    return true;
  }
  return false;
};
isNativeFunction = function isNativeFunction(fetch) {
  return fetch ? /^function\s+\w+\(\)\s+\{\s+\[native code\]\s+\}$/.test(fetch.toString()) : fetch;
};
Object.defineProperty(exports, Symbol.toStringTag, {
  value: "Module"
});
export { isNativeFunction };
export function supportsDOMError() {
  try {
    new DOMError("");
  } catch ($e) {
    return false;
  }
  return true;
}
export function supportsDOMException() {
  try {
    new DOMException("");
  } catch ($e) {
    return false;
  }
  return true;
}
export function supportsErrorEvent() {
  try {
    new ErrorEvent("");
  } catch ($e) {
    return false;
  }
  return true;
}
export { _isFetchSupported as supportsFetch };
export function supportsHistory() {
  return "history" in GLOBAL_OBJ && !!GLOBAL_OBJ.history;
}
export function supportsNativeFetch() {
  if (typeof globalThis.EdgeRuntime === "string") {
    return true;
  }
  if (_isFetchSupported()) {
    if (isNativeFunction(GLOBAL_OBJ.fetch)) {
      return true;
    }
    let r20 = false;
    const document2 = GLOBAL_OBJ.document;
    if (document2 && typeof document2.createElement === "function") {
      try {
        const element = document2.createElement("iframe");
        element.hidden = true;
        document2.head.appendChild(element);
        if (element.contentWindow?.fetch) {
          r20 = isNativeFunction(element.contentWindow.fetch);
        }
        document2.head.removeChild(element);
      } catch (r41) {
        if (DEBUG_BUILD) {
          debug.warn("Could not create sandbox iframe for pure fetch check, bailing to window.fetch: ", r41);
        }
      }
    }
    return r20;
  }
  return false;
}
export function supportsReferrerPolicy() {
  if (_isFetchSupported()) {
    try {
      new Request("_", {
        referrerPolicy: "origin"
      });
    } catch ($e) {
      return false;
    }
    return true;
  }
  return false;
}
export function supportsReportingObserver() {
  return "ReportingObserver" in GLOBAL_OBJ;
}