[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) › OptionalProperty

Defined in: [packages/common/src/Type.ts:10259](https://github.com/evoluhq/evolu/blob/037c390af081e9944d616ff298a729515c5c5ab7/packages/common/src/Type.ts#L10259)

An optional property used to construct an [object](https://evolu.dev/docs/api-reference/common/Type/functions/object) Type.

## Indexable

```ts
[key: symbol]:
  | true
| InferErrors<T>
```

## Properties

<a id="errorssymbol"></a>

### \[errorsSymbol\]

```ts
readonly [errorsSymbol]: InferErrors<T>;
```

Defined in: [packages/common/src/Type.ts:10261](https://github.com/evoluhq/evolu/blob/037c390af081e9944d616ff298a729515c5c5ab7/packages/common/src/Type.ts#L10261)

---

<a id="type"></a>

### type

```ts
readonly type: T;
```

Defined in: [packages/common/src/Type.ts:10260](https://github.com/evoluhq/evolu/blob/037c390af081e9944d616ff298a729515c5c5ab7/packages/common/src/Type.ts#L10260)