Bug: Why does React need to replay beginwork when an exception occurs

[lizuncong]

React version: React17.0.1

Sorry, I am curious why the beginWork function needs to be executed repeatedly if an exception is thrown in the beginWork function. In fact, we can simplify the exception catching logic of the beginWork function

Maybe this would work too

      let caughtError = null;

      function invokeGuardedCallback(func) {
        const evt = document.createEvent("Event");
        const evtType = "react-invokeguardedcallback";
        const fakeNode = document.createElement("react");
        let child; // keep the result of beginWork in the child variable

        function callCallback() {
          fakeNode.removeEventListener(evtType, callCallback, false);
          child = func(); // keep the result of func
        }

        function handleWindowError(event) {
          caughtError = event.error;
        }

        window.addEventListener("error", handleWindowError);
        fakeNode.addEventListener(evtType, callCallback, false);

        evt.initEvent(evtType, false, false);
        fakeNode.dispatchEvent(evt);

        window.removeEventListener("error", handleWindowError);
        return child; // return it
      }

      function beginWork() {
        return "child";
      }
      beginWork$1 = function (current, unitOfWork, lanes) {
        const child = invokeGuardedCallback(beginWork);
        if (hasCaughtError()) {
          var replayError = clearCaughtError();
          throw replayError;
        }
        console.log("next..", child);
        return child;
      };
      beginWork$1();

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