[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:8017](https://github.com/evoluhq/evolu/blob/f0109fb501a593010e858e39248dde1200eeb2d7/packages/common/src/Type.ts#L8017)

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:8018](https://github.com/evoluhq/evolu/blob/f0109fb501a593010e858e39248dde1200eeb2d7/packages/common/src/Type.ts#L8018)

| Name    | Type       | Defined in                                                                                                                                           |
| ------- | ---------- | ---------------------------------------------------------------------------------------------------------------------------------------------------- |
| `kind`  | `"NotSet"` | [packages/common/src/Type.ts:8019](https://github.com/evoluhq/evolu/blob/f0109fb501a593010e858e39248dde1200eeb2d7/packages/common/src/Type.ts#L8019) |
| `value` | `unknown`  | [packages/common/src/Type.ts:8020](https://github.com/evoluhq/evolu/blob/f0109fb501a593010e858e39248dde1200eeb2d7/packages/common/src/Type.ts#L8020) |

---

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

### type

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

Defined in: [packages/common/src/Type.ts:870](https://github.com/evoluhq/evolu/blob/f0109fb501a593010e858e39248dde1200eeb2d7/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)