[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) › InstanceOfError

Defined in: [packages/common/src/Type.ts:3576](https://github.com/evoluhq/evolu/blob/dd96d79f1dbe9a49fa12ce8e0aa7d3d0177795ca/packages/common/src/Type.ts#L3576)

Error returned when a value is not an instance of the expected constructor.

## Extends

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

## Properties

<a id="constructorname"></a>

### constructorName

```ts
readonly constructorName: string;
```

Defined in: [packages/common/src/Type.ts:3577](https://github.com/evoluhq/evolu/blob/dd96d79f1dbe9a49fa12ce8e0aa7d3d0177795ca/packages/common/src/Type.ts#L3577)

---

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

### type

```ts
readonly type: "InstanceOf";
```

Defined in: [packages/common/src/Type.ts:893](https://github.com/evoluhq/evolu/blob/dd96d79f1dbe9a49fa12ce8e0aa7d3d0177795ca/packages/common/src/Type.ts#L893)

#### Inherited from

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

---

<a id="value"></a>

### value

```ts
readonly value: unknown;
```

Defined in: [packages/common/src/Type.ts:911](https://github.com/evoluhq/evolu/blob/dd96d79f1dbe9a49fa12ce8e0aa7d3d0177795ca/packages/common/src/Type.ts#L911)

#### Inherited from

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