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

```ts
type InferFiberOk<TFiber> = TFiber extends Fiber<infer T, any, any> ? T : never;
```

Defined in: [packages/common/src/Task.ts:1658](https://github.com/evoluhq/evolu/blob/037c390af081e9944d616ff298a729515c5c5ab7/packages/common/src/Task.ts#L1658)

Extracts the [Ok](https://evolu.dev/docs/api-reference/common/Result/interfaces/Ok) value type from a [Fiber](https://evolu.dev/docs/api-reference/common/Task/interfaces/Fiber).