[Home](./index.md) > [@firebase/auth](./auth.md) > [Persistence](./auth.persistence.md) ## Persistence interface An interface covering the possible persistence mechanism types. Signature: ```typescript export interface Persistence ``` ## Properties | Property | Type | Description | | --- | --- | --- | | [type](./auth.persistence.type.md) | 'SESSION' \| 'LOCAL' \| 'NONE' | Type of Persistence. - 'SESSION' is used for temporary persistence such as sessionStorage. - 'LOCAL' is used for long term persistence such as localStorage or IndexedDB. - 'NONE' is used for in-memory, or no persistence. |