Type Alias Trigger

A Trigger describes when an accumulator should emit. Pond's live layer factors emission cadence as a first-class concept — orthogonal to the accumulator's aggregation choice — so the same primitive can fire on every event, on sequence boundaries, or (in future) on count thresholds.

Triggers are constructed via the Trigger factory:

import { Trigger, Sequence } from 'pond-ts';

const event = Trigger.event();                              // per-event (default)
const tick  = Trigger.every('30s');                         // sugar: fixed cadence
const clock = Trigger.clock(Sequence.every('30s'));         // explicit Sequence form
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Pass to an accumulator's trigger option to switch its emission cadence:

live.rolling('1m', { latency: 'p95' }, {
  trigger: Trigger.every('30s'),
});
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For partitioned accumulators, a clock trigger synchronises emission across all partitions: when any partition's event crosses a boundary, every partition emits its current rolling-window snapshot at the same boundary timestamp.