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The core relaykit object is a lightweight wrapper that manages the lifecycle of your event stream.

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

await stream.ack(event.id); const pipeline = stream.filter(e => e.amount > 100).map(e => ( ...e, fee: e.amount * 0.03 )).on('error', (err) => logger.error(err));

Batching is automatic—control it via `batch(100)` or `batch({ size: 50, timeoutMs: 1000 })` to trade latency for throughput.

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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.