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

```ts
function createInMemoryLeaderLock(): LeaderLock;
```

Defined in: [packages/common/src/Task.ts:2951](https://github.com/evoluhq/evolu/blob/e7144e2bbe9069362b62dec1b64a8aa922b8f1b0/packages/common/src/Task.ts#L2951)

Creates an in-process [LeaderLock](https://evolu.dev/docs/api-reference/common/Task/interfaces/LeaderLock).

Uses one [Mutex](https://evolu.dev/docs/api-reference/common/Task/interfaces/Mutex) per [Name](https://evolu.dev/docs/api-reference/common/Type/variables/Name). Suitable for runtimes without a
cross-process lock manager (for example in-memory worker tests or React
Native).