[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) › UnionMemberError

Defined in: [packages/common/src/Type.ts:3902](https://github.com/evoluhq/evolu/blob/f0109fb501a593010e858e39248dde1200eeb2d7/packages/common/src/Type.ts#L3902)

An error returned by one [union](https://evolu.dev/docs/api-reference/common/Type/functions/union) member and its index.

## Properties

<a id="error-1"></a>

### error

```ts
readonly error: Error;
```

Defined in: [packages/common/src/Type.ts:3907](https://github.com/evoluhq/evolu/blob/f0109fb501a593010e858e39248dde1200eeb2d7/packages/common/src/Type.ts#L3907)

---

<a id="index-1"></a>

### index

```ts
readonly index: Index;
```

Defined in: [packages/common/src/Type.ts:3906](https://github.com/evoluhq/evolu/blob/f0109fb501a593010e858e39248dde1200eeb2d7/packages/common/src/Type.ts#L3906)