NgRx Effects and HttpClient: Concurrent request ordering and state update latency
Goal: Verify if NgRx Effects that use mergeMap preserve the initiation order of concurrent HTTP requests when dispatching success/failure actions, and measure any resulting latency in state updates. Constraints: The ordering depends on the RxJS operator (mergeMap, concatMap, exhaustMap), NgRx Store version, and selector memoization; there is no built‑in guar
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