[API reference](https://evolu.dev/docs/api-reference) › [@evolu/common](https://evolu.dev/docs/api-reference/common) › [Lookup](https://evolu.dev/docs/api-reference/common/Lookup) › CreateLookupMapOptions

Defined in: [packages/common/src/Lookup.ts:63](https://github.com/evoluhq/evolu/blob/e7144e2bbe9069362b62dec1b64a8aa922b8f1b0/packages/common/src/Lookup.ts#L63)

Options for [createLookupMap](https://evolu.dev/docs/api-reference/common/Lookup/functions/createLookupMap).

## Extends

- `Required`\<[`LookupOption`](https://evolu.dev/docs/api-reference/common/Lookup/interfaces/LookupOption)\<`K`, `L`\>\>

## Properties

<a id="entries"></a>

### entries?

```ts
readonly optional entries?: Iterable<readonly [K, V], any, any>;
```

Defined in: [packages/common/src/Lookup.ts:67](https://github.com/evoluhq/evolu/blob/e7144e2bbe9069362b62dec1b64a8aa922b8f1b0/packages/common/src/Lookup.ts#L67)

Initial entries for the map.

---

<a id="lookup"></a>

### lookup

```ts
readonly lookup: Lookup<K, L>;
```

Defined in: [packages/common/src/Lookup.ts:34](https://github.com/evoluhq/evolu/blob/e7144e2bbe9069362b62dec1b64a8aa922b8f1b0/packages/common/src/Lookup.ts#L34)

Derives the lookup key used for logical equality.

#### Inherited from

```ts
Required.lookup;
```