bulletTrain.segment is throwing an error.

[lomse]

I'm using React v16.12.0

When I use bulletTrain.segment, I get the error below:
bullet_train_client__WEBPACK_IMPORTED_MODULE_1___default.a.segment

Full Code

const environmentID='dfsssffsdsfsfsdsdsggdsfs';

export const useBulletTrain = () => {
  const [hasLoaded, setHasLoaded] = useState(false);
  const [enableTimeAttendance, setEnableTimeAttendance] = useState(false);
  const [belongsToTrailUsers, setBelongToTrialUsers] = useState(false);
  
  useEffect(() => {

    bulletTrain.identify('yhjgjgjhgjgjgjg');
    bulletTrain.init({
      environmentID,
      defaultFlags: {
        enable_time_attendance: false
      },
      onChange: () => {
        try {
          bulletTrain.segment("trial_users");
        } catch (error) {
          console.log({error}) // error caught here 
        }

        setHasLoaded(true);
        setEnableTimeAttendance(bulletTrain.hasFeature("enable_time_attendance"));
        setBelongToTrialUsers(bulletTrain.segment("trial_users"));
      }
    });
  }, []);

  return { hasLoaded, enableTimeAttendance, belongsToTrailUsers };
};

[kyle-ssg]

You cannot get whether a user belongs to a segment directly, we may allow such things in the future but that is perhaps a misuse of the library.

The idea of segments is to control feature flags and remote config with segment overrides.

For your scenario of "trial users" you have 2 options:

Option 1: use setTrait and getTrait to detect and set whether the user is a "trial user".

Although this approach is simple it may not give you the most flexibility.

Suggested approach

It's better to create a feature called "trial_user" and override its enabled state for a segment. I'll explain with some screenshots here to give you a better idea of how this would work:

Step 1 : Create your feature flag for trial users, using whatever default you feel is best for on or off

Step 2: Create a segment that drives the feature flag

Step 3: Set the feature flag to be turned on for that segment

Your code would then be driven by bulletTrain.hasFeature. You'd also get the additional benefit of being able to override this feature on a per user basis / add other segments that have this feature enabled e.g by an email address regex.

[kyle-ssg]

Hopefully this answers your question! If not feel free to reply and I'll get back to you.

[lomse]

Hi @kyle-ssg, thanks for suggesting this approach. Works great.