Function commitBeforeMutationEffectsOnFiber

dash/deps/react-dom@18.3.1.js:23039–23118

(finishedWork)

  }

  function commitBeforeMutationEffectsOnFiber(finishedWork) {
    var current = finishedWork.alternate;
    var flags = finishedWork.flags;

    if ((flags & Snapshot) !== NoFlags) {
      setCurrentFiber(finishedWork);

      switch (finishedWork.tag) {
        case FunctionComponent:
        case ForwardRef:
        case SimpleMemoComponent:
          {
            break;
          }

        case ClassComponent:
          {
            if (current !== null) {
              var prevProps = current.memoizedProps;
              var prevState = current.memoizedState;
              var instance = finishedWork.stateNode; // We could update instance props and state here,
              // but instead we rely on them being set during last render.
              // TODO: revisit this when we implement resuming.

              {
                if (finishedWork.type === finishedWork.elementType && !didWarnAboutReassigningProps) {
                  if (instance.props !== finishedWork.memoizedProps) {
                    error('Expected %s props to match memoized props before ' + 'getSnapshotBeforeUpdate. ' + 'This might either be because of a bug in React, or because ' + 'a component reassigns its own `this.props`. ' + 'Please file an issue.', getComponentNameFromFiber(finishedWork) || 'instance');
                  }

                  if (instance.state !== finishedWork.memoizedState) {
                    error('Expected %s state to match memoized state before ' + 'getSnapshotBeforeUpdate. ' + 'This might either be because of a bug in React, or because ' + 'a component reassigns its own `this.state`. ' + 'Please file an issue.', getComponentNameFromFiber(finishedWork) || 'instance');
                  }
                }
              }

              var snapshot = instance.getSnapshotBeforeUpdate(finishedWork.elementType === finishedWork.type ? prevProps : resolveDefaultProps(finishedWork.type, prevProps), prevState);

              {
                var didWarnSet = didWarnAboutUndefinedSnapshotBeforeUpdate;

                if (snapshot === undefined && !didWarnSet.has(finishedWork.type)) {
                  didWarnSet.add(finishedWork.type);

                  error('%s.getSnapshotBeforeUpdate(): A snapshot value (or null) ' + 'must be returned. You have returned undefined.', getComponentNameFromFiber(finishedWork));
                }
              }

              instance.__reactInternalSnapshotBeforeUpdate = snapshot;
            }

            break;
          }

        case HostRoot:
          {
            {
              var root = finishedWork.stateNode;