forceUnmountCurrentAndReconcile() — react Function Reference

Source Code

packages/react-reconciler/src/ReactFiberBeginWork.js lines 373–403

function forceUnmountCurrentAndReconcile(
  current: Fiber,
  workInProgress: Fiber,
  nextChildren: any,
  renderLanes: Lanes,
) {
  // This function is fork of reconcileChildren. It's used in cases where we
  // want to reconcile without matching against the existing set. This has the
  // effect of all current children being unmounted; even if the type and key
  // are the same, the old child is unmounted and a new child is created.
  //
  // To do this, we're going to go through the reconcile algorithm twice. In
  // the first pass, we schedule a deletion for all the current children by
  // passing null.
  workInProgress.child = reconcileChildFibers(
    workInProgress,
    current.child,
    null,
    renderLanes,
  );
  // In the second pass, we mount the new children. The trick here is that we
  // pass null in place of where we usually pass the current child set. This has
  // the effect of remounting all children regardless of whether their
  // identities match.
  workInProgress.child = reconcileChildFibers(
    workInProgress,
    null,
    nextChildren,
    renderLanes,
  );
}