Function handleEvents

packages/shared/src/lib/lifecycle.ts:167–214

(evt: Event)

  };

  const handleEvents = (evt: Event): void => {
    if (IS_SAFARI) {
      clearTimeout(safariBeforeUnloadTimeout);
    }

    // eslint-disable-next-line default-case
    switch (evt.type) {
      case 'pageshow':
      case 'resume':
        dispatchChangesIfNeeded(evt, getCurrentLifecycleState());
        break;
      case 'focus':
        if (wasActive) {
          dispatchChangesIfNeeded(evt, ACTIVE);
        }
        break;
      case 'scroll':
      case 'mousedown':
      case 'touchstart':
        dispatchChangesIfNeeded(evt, ACTIVE);
        break;
      case 'blur':
        // The `blur` event can fire while the page is being unloaded, so we
        // only need to update the state if the current state is "active".
        if (state === ACTIVE) {
          dispatchChangesIfNeeded(evt, getInternalLifecycleState());
        }
        break;
      case 'pagehide':
      case 'unload':
        dispatchChangesIfNeeded(
          evt,
          (evt as PageTransitionEvent).persisted ? FROZEN : TERMINATED,
        );
        break;
      case 'visibilitychange':
        // The document's `visibilityState` will change to hidden  as the page
        // is being unloaded, but in such cases the lifecycle state shouldn't
        // change.
        if (state !== FROZEN && state !== TERMINATED) {
          dispatchChangesIfNeeded(evt, getInternalLifecycleState());
        }
        break;
      case 'freeze':
        dispatchChangesIfNeeded(evt, FROZEN);
        break;
    }
  };

  // Add capturing events on window so they run immediately.
  EVENTS.forEach((evt) => window.addEventListener(evt, handleEvents, true));