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

```ts
type InferOption<O> = O extends Some<infer T> ? T : never;
```

Defined in: [packages/common/src/Option.ts:59](https://github.com/evoluhq/evolu/blob/037c390af081e9944d616ff298a729515c5c5ab7/packages/common/src/Option.ts#L59)

Extracts the value type from an [Option](https://evolu.dev/docs/api-reference/common/Option/type-aliases/Option) or [Some](https://evolu.dev/docs/api-reference/common/Option/interfaces/Some).