[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) › MapValueIssue

```ts
type MapValueIssue<Error> = Error extends TypeError
  ? {
      error: Error;
      index: number;
      key: unknown;
      kind: "Value";
    }
  : never;
```

Defined in: [packages/common/src/Type.ts:8635](https://github.com/evoluhq/evolu/blob/037c390af081e9944d616ff298a729515c5c5ab7/packages/common/src/Type.ts#L8635)

An invalid value and its entry index in a [map](https://evolu.dev/docs/api-reference/common/Type/functions/map).