Function storeCleanupWithContext

packages/core/src/render3/util/view_utils.ts:337–365

(
  tView: TView,
  lView: LView,
  context: any,
  cleanupFn: Function,
)

 * - Index of context we just saved in LView.cleanupInstances
 */
export function storeCleanupWithContext(
  tView: TView,
  lView: LView,
  context: any,
  cleanupFn: Function,
): void {
  const lCleanup = getOrCreateLViewCleanup(lView);

  // Historically the `storeCleanupWithContext` was used to register both framework-level and
  // user-defined cleanup callbacks, but over time those two types of cleanups were separated.
  // This dev mode checks assures that user-level cleanup callbacks are _not_ stored in data
  // structures reserved for framework-specific hooks.
  ngDevMode &&
    assertDefined(
      context,
      'Cleanup context is mandatory when registering framework-level destroy hooks',
    );
  lCleanup.push(context);

  if (tView.firstCreatePass) {
    getOrCreateTViewCleanup(tView).push(cleanupFn, lCleanup.length - 1);
  } else {
    // Make sure that no new framework-level cleanup functions are registered after the first
    // template pass is done (and TView data structures are meant to fully constructed).
    if (ngDevMode) {
      Object.freeze(getOrCreateTViewCleanup(tView));
    }
  }
}