[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) › SetNotSetError

Defined in: [packages/common/src/Type.ts:8023](https://github.com/evoluhq/evolu/blob/037c390af081e9944d616ff298a729515c5c5ab7/packages/common/src/Type.ts#L8023)

Error returned when a [set](https://evolu.dev/docs/api-reference/common/Type/functions/set) input is not a Set.

## Extends

- [`TypeError`](https://evolu.dev/docs/api-reference/common/Type/interfaces/TypeError)\<`"Set"`\>

## Properties

<a id="reason"></a>

### reason

```ts
readonly reason: {
  kind: "NotSet";
  value: unknown;
};
```

Defined in: [packages/common/src/Type.ts:8024](https://github.com/evoluhq/evolu/blob/037c390af081e9944d616ff298a729515c5c5ab7/packages/common/src/Type.ts#L8024)

| Name    | Type       | Defined in                                                                                                                                           |
| ------- | ---------- | ---------------------------------------------------------------------------------------------------------------------------------------------------- |
| `kind`  | `"NotSet"` | [packages/common/src/Type.ts:8025](https://github.com/evoluhq/evolu/blob/037c390af081e9944d616ff298a729515c5c5ab7/packages/common/src/Type.ts#L8025) |
| `value` | `unknown`  | [packages/common/src/Type.ts:8026](https://github.com/evoluhq/evolu/blob/037c390af081e9944d616ff298a729515c5c5ab7/packages/common/src/Type.ts#L8026) |

---

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

### type

```ts
readonly type: "Set";
```

Defined in: [packages/common/src/Type.ts:870](https://github.com/evoluhq/evolu/blob/037c390af081e9944d616ff298a729515c5c5ab7/packages/common/src/Type.ts#L870)

#### Inherited from

[`TypeError`](https://evolu.dev/docs/api-reference/common/Type/interfaces/TypeError).[`type`](https://evolu.dev/docs/api-reference/common/Type/interfaces/TypeError#type)