Feature: return a promise from reloadFeatureFlags

[dbartholomae]

Hi there!

I'm running into the following problem: When a user signs in, I identify them, and feature flags might change. I didn't find a way to wait for the new feature flags to load. They are already loaded based on the non-identified user, so hasLoadedFlags will already be permanently true, so ensureFlagsLoaded and onFeatureFlags won't help either.

My current suggestion would be to return a Promise from reloadFeatureFlags. This way, I could await that promise right after I call identify.

[peterjskaltsis]

I believe we were able to do this with a callback previously, but it looks like this was removed in the more recent versions of posthog-react-native?

[marandaneto]

@dbartholomae which SDK are you using and which version?

[dbartholomae]

This is in a web app, using posthog-js 1.279.0

[marandaneto]

cc @PostHog/team-feature-flags

[wassim-ben-amor]

Hello, I have encountered this issue:

1. Call setPersonProperties(props)
2. Call reloadFeatureFlags()
3. Wait for the onFeatureFlags callback to fire
4. Immediately call posthog.getFeatureFlag(flagName) => it returns an incorrect value based on the release condition
5. Calling posthog.getFeatureFlag(flagName) again after some time → it returns the correct value

It seems that the first read after onFeatureFlags does not reflect the updated flag state.