[Home](./index.md) > [@firebase/auth](./auth.md) > [Dependencies](./auth.dependencies.md) > [persistence](./auth.dependencies.persistence.md) ## Dependencies.persistence property Which [Persistence](./auth.persistence.md) to use. If this is an array, the first `Persistence` that the device supports is used. The SDK searches for an existing account in order and, if one is found in a secondary `Persistence`, the account is moved to the primary `Persistence`. If no persistence is provided, the SDK falls back on [inMemoryPersistence](./auth.inmemorypersistence.md). Signature: ```typescript persistence?: Persistence | Persistence[]; ```