How to handle network interruptions

Cached flags and a durable event queue.

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Flag reads keep the last snapshot for the current targeting key. Do not block the UI on refreshFlags() when a snapshot exists. Identity changes drop that snapshot on purpose.

track returns when the queue accepts the event. Await persisted for the disk write. The browser retries flush when the document fires online. Keep the original eventId after a timeout. Server handlers should flush inside the request budget and use SQLite if a timeout must not lose the event.

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How to track events in Node.js

Identify the request, track, and flush.

How to test flag evaluation

Pass fetchImpl. Do not point tests at production.