Storage adapter interface matching what Better Auth expects.

## Properties

### getItem

> **getItem**: (`key`) => `string` \| `Promise`\<`string` \| `null`\> \| `null`

#### Parameters

##### key

`string`

#### Returns

`string` \| `Promise`\<`string` \| `null`\> \| `null`

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### removeItem?

> `optional` **removeItem?**: (`key`) => `void` \| `Promise`\<`void`\>

#### Parameters

##### key

`string`

#### Returns

`void` \| `Promise`\<`void`\>

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### setItem

> **setItem**: (`key`, `value`) => `void` \| `Promise`\<`void`\>

#### Parameters

##### key

`string`

##### value

`string`

#### Returns

`void` \| `Promise`\<`void`\>