Is your feature request related to a problem?

When bringing up new servers, there's a small chance that the local evaluation endpoint is having an outage just as the servers are coming up with the posthog-node client. This will cause the clients to fallback to remote evaluation.

It would be handy to have a way to check if local feature flags have been cached so that can be reported to a load balancer.

Describe the solution you'd like

A new method (naming can be debated here):

function localEvaluationFlagsLoaded(): boolean {
    return this.featureFlags.length > 0
}

async function waitForLocalEvaluationReady(): Promise<boolean> {}

Describe alternatives you've considered

Considered a callback or event when local flags are loaded, but that wouldn't initiate a load and cache of local flag definitions.

Related sub-libraries

• All of them
• posthog-web
• posthog-node
• posthog-ai
• posthog-react-native

Additional context

https://posthoghelp.zendesk.com/agent/tickets/28510

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