Limits on event ordering in Reflex event queue

Understanding event ordering in Reflex

In Reflex, component state changes are triggered by events queued in a global event registry. When multiple events target the same component, the framework does not document a deterministic processing order. This can affect UI consistency, especially when rapid user interactions or auto‑reload actions generate overlapping events.

The current behavior appears nondeterministic: two consecutive button clicks may be handled in an interleaved or reversed sequence, depending on timing and the internal event loop implementation. This lack of a guaranteed FIFO order introduces race‑like conditions that are not yet addressed in the official documentation.

Key constraints:

• Auto‑reload support is only available on the development server, which may alter event scheduling.
• Component destruction does not always purge its event listeners, potentially affecting subsequent event handling.
• The event queue is shared across all components, so ordering is influenced by the global registration order.

Given these uncertainties, we need to clarify how Reflex manages event ordering and whether any configuration can enforce deterministic processing.

1. Does Reflex guarantee a first‑in, first‑out order for events targeting the same component?
2. If not, what internal factors (e.g., event loop scheduling, component lifecycle timing) influence the final order?
3. Are there any documented settings or best‑practice patterns to enforce a deterministic order in production deployments?