A useEffect's within useDecision will flap the auto update listeners on every render.

[epatey]

This useEffect will mount and execute on every single render. The root cause is that getCurrentDecision in useDecision is not wrapped in useCallback like it is in the other hooks.

  const getCurrentDecision: () => { decision: OptimizelyDecision } = () => ({
    decision: optimizely.decide(flagKey, options.decideOptions, overrides.overrideUserId, overrideAttrs),
  });

  ...

  useEffect(() => {
    // Subscribe to update after first datafile is fetched and readyPromise is resolved to avoid redundant rendering.
    if (optimizely.getIsReadyPromiseFulfilled() && options.autoUpdate) {
      return setupAutoUpdateListeners(optimizely, HookType.FEATURE, flagKey, hooksLogger, () => {
        setState(prevState => ({
          ...prevState,
          ...getCurrentDecision(),
        }));
      });
    }
    return (): void => { };
  }, [optimizely.getIsReadyPromiseFulfilled(), options.autoUpdate, optimizely, flagKey, getCurrentDecision]);

[mikechu-optimizely]

Thanks for reporting this. I've created a work ticket (FSSDK-9624) to review.

[junaed-optimizely]

This has been addressed already in #273 , and a patch release v3.2.1 is also out with the changes. Closing..