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Graceful shutdown waits for in-flight events to complete, then closes connections cleanly—no lost events, no crashes.

Each event flows through a series of transformation stages, with built-in support for filtering, mapping, and conditional routing.

const batch = stream.pipe(filter((e) => e.type === 'payment'), batch(100), debounce(5000));

Rate limiting is built in: configure token buckets, sliding windows, or adaptive limits that respond to backpressure.

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The TypeScript types are fully inferred; no manual type assertions needed even with complex nested schemas.

const stream = new RelayKit( apiKey: process.env.API_KEY, region: 'us-east-1' );

Metrics are published to standard formats (Prometheus, CloudWatch, DataDog) with zero configuration.