[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:208](https://github.com/evoluhq/evolu/blob/e7144e2bbe9069362b62dec1b64a8aa922b8f1b0/packages/common/src/Worker.ts#L208)

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.