[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) › MapNotMapError

Defined in: [packages/common/src/Type.ts:9829](https://github.com/evoluhq/evolu/blob/dd96d79f1dbe9a49fa12ce8e0aa7d3d0177795ca/packages/common/src/Type.ts#L9829)

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

## Extends

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

## Properties

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

### reason

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

Defined in: [packages/common/src/Type.ts:9830](https://github.com/evoluhq/evolu/blob/dd96d79f1dbe9a49fa12ce8e0aa7d3d0177795ca/packages/common/src/Type.ts#L9830)

| Name    | Type       | Defined in                                                                                                                                           |
| ------- | ---------- | ---------------------------------------------------------------------------------------------------------------------------------------------------- |
| `kind`  | `"NotMap"` | [packages/common/src/Type.ts:9831](https://github.com/evoluhq/evolu/blob/dd96d79f1dbe9a49fa12ce8e0aa7d3d0177795ca/packages/common/src/Type.ts#L9831) |
| `value` | `unknown`  | [packages/common/src/Type.ts:9832](https://github.com/evoluhq/evolu/blob/dd96d79f1dbe9a49fa12ce8e0aa7d3d0177795ca/packages/common/src/Type.ts#L9832) |

---

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

### type

```ts
readonly type: "Map";
```

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

#### 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)