Function refreshView

packages/core/src/render3/instructions/change_detection.ts:190–417

(
  tView: TView,
  lView: LView,
  templateFn: ComponentTemplate<{}> | null,
  context: T,
)

 */

export function refreshView<T>(
  tView: TView,
  lView: LView,
  templateFn: ComponentTemplate<{}> | null,
  context: T,
) {
  ngDevMode && assertEqual(isCreationMode(lView), false, 'Should be run in update mode');

  if (isDestroyed(lView)) return;

  const flags = lView[FLAGS];

  // Check no changes mode is a dev only mode used to verify that bindings have not changed
  // since they were assigned. We do not want to execute lifecycle hooks in that mode.
  const isInCheckNoChangesPass = ngDevMode && isInCheckNoChangesMode();
  const isInExhaustiveCheckNoChangesPass = ngDevMode && isExhaustiveCheckNoChanges();

  // Start component reactive context
  // - We might already be in a reactive context if this is an embedded view of the host.
  // - We might be descending into a view that needs a consumer.
  enterView(lView);
  let returnConsumerToPool = true;
  let prevConsumer: ReactiveNode | null = null;
  let currentConsumer: ReactiveLViewConsumer | null = null;
  if (!isInCheckNoChangesPass) {
    if (viewShouldHaveReactiveConsumer(tView)) {
      currentConsumer = getOrBorrowReactiveLViewConsumer(lView);
      prevConsumer = consumerBeforeComputation(currentConsumer);
    } else if (getActiveConsumer() === null) {
      // If the current view should not have a reactive consumer but we don't have an active consumer,
      // we still need to create a temporary consumer to track any signal reads in this template.
      // This is a rare case that can happen with
      // - `viewContainerRef.createEmbeddedView(...).detectChanges()`.
      // - `viewContainerRef.createEmbeddedView(...)` without any other dirty marking on the parent,
      //   flagging the parent component for traversal but not triggering a full `refreshView`.
      // This temporary consumer marks the first parent that _should_ have a consumer for refresh.
      // Once that refresh happens, the signals will be tracked in the parent consumer and we can destroy
      // the temporary one.
      returnConsumerToPool = false;
      currentConsumer = getOrCreateTemporaryConsumer(lView);
      prevConsumer = consumerBeforeComputation(currentConsumer);
    } else if (lView[REACTIVE_TEMPLATE_CONSUMER]) {
      consumerDestroy(lView[REACTIVE_TEMPLATE_CONSUMER]);
      lView[REACTIVE_TEMPLATE_CONSUMER] = null;
    }
  }

  try {
    resetPreOrderHookFlags(lView);

    setBindingIndex(tView.bindingStartIndex);
    if (templateFn !== null) {
      executeTemplate(tView, lView, templateFn, RenderFlags.Update, context);
    }

    const hooksInitPhaseCompleted =
      (flags & LViewFlags.InitPhaseStateMask) === InitPhaseState.InitPhaseCompleted;