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

```ts
type DiscriminatedUnionError<Key, Expected, MemberIssue> =
  | DiscriminatedUnionObjectError
  | DiscriminatedUnionPropertyAccessError<Key>
  | DiscriminatedUnionDiscriminatorError<Key, Expected>
  | DiscriminatedUnionMemberError<MemberIssue>;
```

Defined in: [packages/common/src/Type.ts:12523](https://github.com/evoluhq/evolu/blob/037c390af081e9944d616ff298a729515c5c5ab7/packages/common/src/Type.ts#L12523)

An error returned while selecting a member in [discriminatedUnion](https://evolu.dev/docs/api-reference/common/Type/functions/discriminatedUnion).