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

```ts
function isOk<T, E>(result: Result<T, E>): result is Ok<T>;
```

Defined in: [packages/common/src/Result.ts:318](https://github.com/evoluhq/evolu/blob/e7144e2bbe9069362b62dec1b64a8aa922b8f1b0/packages/common/src/Result.ts#L318)

Type guard for [Ok](https://evolu.dev/docs/api-reference/common/Result/interfaces/Ok) results.