[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:12517](https://github.com/evoluhq/evolu/blob/f0109fb501a593010e858e39248dde1200eeb2d7/packages/common/src/Type.ts#L12517)

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