unionSchedules - API reference

API reference › @evolu/common › Schedule › unionSchedules

function unionSchedules<OutputA, OutputB, Input>(
  a: Schedule<OutputA, Input>,
  b: Schedule<OutputB, Input>,
): Schedule<OutputA | OutputB, Input>;

Defined in: packages/common/src/Schedule.ts:1910

Combines two schedules with OR semantics.

Continues while either schedule wants to continue. Uses the minimum delay.

Combining constraints with OR

import {
  assertErr,
  assertOk,
  done,
  spaced,
  take,
  testCreateDeps,
  unionSchedules,
} from "@evolu/common";

// The second policy keeps the union alive after the first one stops.
const either = unionSchedules(
  take(1)(spaced("100ms")),
  take(2)(spaced("200ms")),
);
const step = either(testCreateDeps());
assertOk(step(undefined), [100, 100]);
assertOk(step(undefined), [200, 200]);
assertErr(step(undefined), done());