[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) › InferErr

```ts
type InferErr<R> = R extends Err<infer E> ? E : never;
```

Defined in: [packages/common/src/Result.ts:317](https://github.com/evoluhq/evolu/blob/037c390af081e9944d616ff298a729515c5c5ab7/packages/common/src/Result.ts#L317)

Infers the error type from a [Result](https://evolu.dev/docs/api-reference/common/Result/type-aliases/Result).