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

```ts
function createWorker<Input, Output>(
  initWorker: (self: WorkerSelf<Input, Output>) => void,
): Worker<Input, Output>;
```

Defined in: [packages/common/src/Worker.ts:296](https://github.com/evoluhq/evolu/blob/037c390af081e9944d616ff298a729515c5c5ab7/packages/common/src/Worker.ts#L296)

Creates an in-memory [Worker](https://evolu.dev/docs/api-reference/common/Worker/interfaces/Worker).

This is a memory-only fallback for platforms without native worker support.
Message delivery is asynchronous in-process.