[API reference](https://evolu.dev/docs/api-reference) › [@evolu/common](https://evolu.dev/docs/api-reference/common) › [Schedule](https://evolu.dev/docs/api-reference/common/Schedule) › once

```ts
const once: Schedule<number>;
```

Defined in: [packages/common/src/Schedule.ts:190](https://github.com/evoluhq/evolu/blob/037c390af081e9944d616ff298a729515c5c5ab7/packages/common/src/Schedule.ts#L190)

A schedule that runs exactly once with no delay.

Equivalent to `take(1)(forever)`. Useful for one-shot operations.

### Scheduling one recurrence

```ts

// Produce one scheduled recurrence, then stop.
const oneShot = once;
const step = oneShot(testCreateDeps());
assertOk(step(undefined), [0, 0]);
assertErr(step(undefined), done());
```