statelyai/xstate @xstate/store@3.10.0

on GitHub

Minor Changes

• #5323 cb08332 Thanks @davidkpiano! - Added support for effect-only transitions that don't trigger state updates. Now, when a transition returns the same state but includes effects, subscribers won't be notified of a state change, but the effects will still be executed. This helps prevent unnecessary re-renders while maintaining side effect functionality.

  it('should not trigger update if the snapshot is the same even if there are effects', () => {
    const store = createStore({
      context: { count: 0 },
      on: {
        doNothing: (ctx, _, enq) => {
          enq.effect(() => {
            // …
          });
          return ctx; // Context is the same, so no update is triggered
          // This is the same as not returning anything (void)
        }
      }
    });
  
    const spy = vi.fn();
    store.subscribe(spy);
  
    store.trigger.doNothing();
    store.trigger.doNothing();
  
    expect(spy).toHaveBeenCalledTimes(0);
  });